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Broadband and continuous wave pumped second-harmonic generation from microfiber coated with layered GaSe crystal 被引量:1
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作者 Zhen Hao Biqiang Jiang +3 位作者 Yuxin Ma Ruixuan Yi Xuetao Gan Jianlin Zhao 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2023年第9期59-68,共10页
The conversion-efficiency for second-harmonic(SH)in optical fibers is significantly limited by extremely weak second-order nonlinearity of fused silica,and pulse pump lasers with high peak power are widely employed.He... The conversion-efficiency for second-harmonic(SH)in optical fibers is significantly limited by extremely weak second-order nonlinearity of fused silica,and pulse pump lasers with high peak power are widely employed.Here,we propose a simple strategy to efficiently realize the broadband and continuous wave(CW)pumped SH,by transferring a crystalline GaSe coating onto a microfiber with phase-matching diameter.In the experiment,high efficiency up to 0.08%W-1mm-1 is reached for a C-band pump laser.The high enough efficiency not only guarantees SH at a single frequency pumped by a CW laser,but also multi-frequencies mixing supported by three CW light sources.Moreover,broadband SH spectrum is also achieved under the pump of a superluminescent light-emitting diode source with a 79.3 nm bandwidth.The proposed scheme provides a beneficial method to the enhancement of various nonlinear parameter processes,development of quasi-monochromatic or broadband CW light sources at new wavelength regions. 展开更多
关键词 nonlinear optics second-harmonic generation continuous wave pump high efficiency multi-frequencies mixing broad spectra MICROFIBERS gallium selenide
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Optical second-harmonic generation imaging for identifying gastrointestinal stromal tumors
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作者 Shichao Zhang Xingxin Huang +6 位作者 Deyong Kang Jikui Miao Zhenlin Zhan Guoxian Guan Jianxin Chen Yongjian Zhou Lianhuang Li 《Journal of Innovative Optical Health Sciences》 SCIE EI CSCD 2023年第5期139-146,共8页
Gastrointestinal stromal tumors(GISTs)are the most common mesenchymal tumors arising in the digest tract.It brings a challenge to diagnosis because it is asymptomatic clinically.It is well known that tumor development... Gastrointestinal stromal tumors(GISTs)are the most common mesenchymal tumors arising in the digest tract.It brings a challenge to diagnosis because it is asymptomatic clinically.It is well known that tumor development is often accompanied by the changes in the morphology of collagen fibers.Nowadays,an emerging optical imaging technique,second-harmonic generation(SHG),can directly identify collagen fibers without staining due to its noncentrosymmetric properties.Therefore,in this study,we attempt to assess the feasibility of SHG imaging for detecting GISTs by monitoring the morphological changes of collagen fibers in tumor microenvironment.We found that collagen alterations occurred obviously in the GISTs by comparing with normal tissues,and furthermore,two morphological features from SHG images were extracted to quantitatively assess the morphological difference of collagen fibers between normal muscular layer and GISTs by means of automated image analysis.Quantitative analyses show a significant difference in the two collagen features.This study demonstrates the potential of SHG imaging as an adjunctive diagnostic tool for label-free identification of GISTs. 展开更多
关键词 Multiphoton imaging two-photon excited fluorescence second-harmonic generation gastrointestinal stromal tumors.
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Resonantly enhanced second-and third-harmonic generation in dielectric nonlinear metasurfaces 被引量:1
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作者 Ji Tong Wang Pavel Tonkaev +5 位作者 Kirill Koshelev Fangxing Lai Sergey Kruk Qinghai Song Yuri Kivshar Nicolae C.Panoiu 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2024年第5期5-19,共15页
Nonlinear dielectric metasurfaces provide a promising approach to control and manipulate frequency conversion optical processes at the nanoscale,thus facilitating both advances in fundamental research and the developm... Nonlinear dielectric metasurfaces provide a promising approach to control and manipulate frequency conversion optical processes at the nanoscale,thus facilitating both advances in fundamental research and the development of new practical applications in photonics,lasing,and sensing.Here,we employ symmetry-broken metasurfaces made of centrosymmetric amorphous silicon for resonantly enhanced second-and third-order nonlinear optical response.Exploiting the rich physics of optical quasi-bound states in the continuum and guided mode resonances,we comprehensively study through rigorous numerical calculations the relative contribution of surface and bulk effects to second-harmonic generation(SHG)and the bulk contribution to third-harmonic generation(THG) from the meta-atoms.Next,we experimentally achieve optical resonances with high quality factors,which greatly boosts light-matter interaction,resulting in about 550 times SHG enhancement and nearly 5000-fold increase of THG.A good agreement between theoretical predictions and experimental measurements is observed.To gain deeper insights into the physics of the investigated nonlinear optical processes,we further numerically study the relation between nonlinear emission and the structural asymmetry of the metasurface and reveal that the generated harmonic signals arising from linear sharp resonances are highly dependent on the asymmetry of the meta-atoms.Our work suggests a fruitful strategy to enhance the harmonic generation and effectively control different orders of harmonics in all-dielectric metasurfaces,enabling the development of efficient active photonic nanodevices. 展开更多
关键词 second-harmonic generation third-harmonic generation bound state in the continuum guided mode resonance all-dielectric metasurfaces nonlinear optics
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Time-domain analysis of second-harmonic generation of primary Lamb wave propagation in an elastic plate 被引量:2
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作者 邓明晰 项延训 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第11期456-464,共9页
Within the second-order perturbation approximation, this paper investigates the physical process of generation of the time-domain second harmonic by a primary Lamb wave waveform in an elastic plate. The present work i... Within the second-order perturbation approximation, this paper investigates the physical process of generation of the time-domain second harmonic by a primary Lamb wave waveform in an elastic plate. The present work is performed based on the preconditions that the phase velocity matching is satisfied and that the transfer of energy from the primary Lamb wave to the double frequency Lamb wave is not zero. It investigates the influences of the difference between the group velocities of the primary Lamb wave and the double frequency Lamb wave, the propagation distance and the duration of the primary Lamb wave waveform on the envelope shape of the time-domain second harmonic. It finds that the maximum magnitude of the envelope of the second-harmonic waveform can grow within some propagation distance even if the condition of group velocity matching is not satisfied. Our analyses also indicate that the maximum magnitude of the envelope of the second-harmonic waveform is kept constant beyond a specific propagation distance. Furthermore, it concludes that the integration amplitude of the time-domain second-harmonic waveform always grows with propagation distance within the second-order perturbation. The present research yields new physical insight not previously available into the effect of generation of the time-domain second harmonic by propagation of a primary Lamb wave waveform. 展开更多
关键词 Lamb wave second-harmonic generation group velocity matching phase velocity matching
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Numerical Perspective of Second-Harmonic Generation of Circumferential Guided Wave Propagation in a Circular Tube 被引量:2
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作者 李明亮 邓明晰 +2 位作者 朱武军 高广健 项延训 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第12期81-85,共5页
The effect of second-harmonic generation (SHG) by primary (fundamental) circumferential guided wave (CGW) propagation is investigated from a numerical standpoint. To enable that the second harmonic of the primar... The effect of second-harmonic generation (SHG) by primary (fundamental) circumferential guided wave (CGW) propagation is investigated from a numerical standpoint. To enable that the second harmonic of the primary CGW mode can accumulate along the circumferential direction, an appropriate mode pair of primary and double frequency CGWs is chosen. Finite element simulations and evaluations of nonlinear CGW propagation are analyzed for the selected CGW mode pair. The numerical simulations performed directly demonstrate that the response of SHG is completely generated by the desired primary CGW mode that satisfies the condition of phase velocity matching at a specific driving frequency, and that the second harmonic of the primary CGW mode does have a cumulative effect with circumferential angles. The numerical perspective obtained yields an insight into the complicated physical process of SHG of primary CGW propagation unavailable previously. 展开更多
关键词 of on MODE Numerical Perspective of second-harmonic generation of Circumferential Guided Wave Propagation in a Circular Tube in SHG is for that
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INFINITELY MANY SOLITARY WAVES DUE TO THE SECOND-HARMONIC GENERATION IN QUADRATIC MEDIA 被引量:1
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作者 Chunhua WANG Jing ZHOU 《Acta Mathematica Scientia》 SCIE CSCD 2020年第1期16-34,共19页
In this paper, we consider the following coupled Schrodinger system with χ^(2) nonlinearities {-Δu1+V1(x)u1=αu1u2,x∈R^N,-Δu2+V2(x)u2=α/2u^21+βu^22,x∈R^N.which arises from second-harmonic generation in quadrati... In this paper, we consider the following coupled Schrodinger system with χ^(2) nonlinearities {-Δu1+V1(x)u1=αu1u2,x∈R^N,-Δu2+V2(x)u2=α/2u^21+βu^22,x∈R^N.which arises from second-harmonic generation in quadratic media. Here V1(x) and V2(x) are radially positive functions, 2 ≤ N < 6, α > 0 and α > β. Assume that the potential functions V1(x) and V2(x) satisfy some algebraic decay at infinity. Applying the finite dimensional reduction method, we construct an unbounded sequence of non-radial vector solutions of synchronized type. 展开更多
关键词 χ^(2)nonlinearities second-harmonic generation synchronized SOLUTION REDUCTION method
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Enhancement effect of cumulative second-harmonic generation by closed propagation feature of circumferential guided waves 被引量:1
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作者 Guang-Jian Gao Ming-Xi Deng +1 位作者 Ning Hu Yan-Xun Xiang 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第2期301-308,共8页
On the basis of second-order perturbation approximate and modal expansion approach,we investigate the enhancement effect of cumulative second-harmonic generation(SHG)of circumferential guided waves(CGWs)in a circular ... On the basis of second-order perturbation approximate and modal expansion approach,we investigate the enhancement effect of cumulative second-harmonic generation(SHG)of circumferential guided waves(CGWs)in a circular tube,which is inherently induced by the closed propagation feature of CGWs.An appropriate mode pair of primary-and double-frequency CGWs satisfying the phase velocity matching and nonzero energy flux is selected to ensure that the second harmonic generated by primary CGW propagation can accumulate along the circumference.Using a coherent superposition of multi-waves,a model of unidirectional CGW propagation is established for analyzing the enhancement effect of cumulative SHG of primary CGW mode selected.The theoretical analyses and numerical simulations performed directly demonstrate that the second harmonic generated does have a cumulative effect along the circumferential direction and the closed propagation feature of CGWs does enhance the magnitude of cumulative second harmonic generated.Potential applications of the enhancement effect of cumulative SHG of CGWs are considered and discussed.The theoretical analysis and numerical simulation perspective presented here yield an insight previously unavailable into the physical mechanism of the enhancement effect of cumulative SHG by closed propagation feature of CGWs in a circular tube. 展开更多
关键词 CIRCUMFERENTIAL guided wave second-harmonic generation(SHG) enhancement effect of CUMULATIVE SHG CLOSED PROPAGATION FEATURE
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Analysis of Second-Harmonic Generation of Low-Frequency Dilatational Lamb Waves in a Two-Layered Composite Plate 被引量:2
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作者 Han Chen Ming-Xi Deng +3 位作者 Ning Hu Ming-Liang Li Guang-Jian Gao Yan-Xun Xiang 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第11期46-50,共5页
We analyze the effect of second-harmonic generation(SHG) of primary Lamb wave propagation in a two-layered composite plate, and then investigate the influence of interfacial properties on the said effect at low freq... We analyze the effect of second-harmonic generation(SHG) of primary Lamb wave propagation in a two-layered composite plate, and then investigate the influence of interfacial properties on the said effect at low frequency. It is found that changes in the interfacial properties essentially affect the dispersion relation and then the maximum cumulative distance of the double-frequency Lamb wave generated. This will remarkably influence the efficiency of SHG. To overcome the complications arising from the inherent dispersion and multimode natures in analyzing the SHG effect of Lamb waves, the present work focuses on the analysis of the SHG effect of low-frequency dilatational Lamb wave propagation. Both the numerical analysis and finite element simulation indicate that the SHG effect of low-frequency dilatational Lamb wave propagation is found to be much more sensitive to changes in the interfacial properties than primary Lamb waves. The potential of using the SHG effect of low-frequency dilatational Lamb waves to characterize a minor change in the interfacial properties is analyzed. 展开更多
关键词 SHG Analysis of second-harmonic generation of Low-Frequency Dilatational Lamb Waves in a Two-Layered Composite Plate
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Experimental Observation of Cumulative Second-Harmonic Generation of Circumferential Guided Wave Propagation in a Circular Tube 被引量:2
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作者 邓明晰 高广健 李明亮 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第12期88-91,共4页
The experimental observation of cumulative second-harmonic generation of the primary circumferential guided wave propagation is reported. A pair of wedge transducers is used to generate the primary circumferential gui... The experimental observation of cumulative second-harmonic generation of the primary circumferential guided wave propagation is reported. A pair of wedge transducers is used to generate the primary circumferential guided wave desired and to detect its fundamental-frequency and second-harmonic amplitudes on the outside surface of the circular tube. The amplitudes of the fundamental waves and the second harmonics of the circumferential guided wave propagation are measured for different separations between the two wedge transducers. At the driving frequency where the primary and the double-frequency circumferential guided waves have the same linear phase velocities, the clear second-harmonic signals can be observed. The quantitative relationships between the second-harmonic amplitudes and circumferential angle are analyzed. It is experimentally verified that the second harmonics of primary circumferential guided waves do have a cumulative growth effect with the circumferential angle. 展开更多
关键词 LENGTH Experimental Observation of Cumulative second-harmonic generation of Circumferential Guided Wave Propagation in a Circular Tube
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Imaging the crystal orientation of 2D transition metal dichalcogenides using polarization-resolved second-harmonic generation 被引量:2
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作者 George Miltos Maragkakis Sotiris Psilodimitrakopoulos +4 位作者 Leonidas Mouchliadis Ioannis Paradisanos Andreas Lemonis George Kioseoglou Emmanuel Stratakis 《Opto-Electronic Advances》 2019年第11期12-19,共8页
We use laser-scanning nonlinear imaging microscopy in atomically thin transition metal dichalcogenides(TMDs)to reveal information on the crystalline orientation distribution,within the 2D lattice.In particular,we perf... We use laser-scanning nonlinear imaging microscopy in atomically thin transition metal dichalcogenides(TMDs)to reveal information on the crystalline orientation distribution,within the 2D lattice.In particular,we perform polarization-resolved second-harmonic generation(PSHG)imaging in a stationary,raster-scanned chemical vapor deposition(CVD)-grown WS2 flake,in order to obtain with high precision a spatially resolved map of the orientation of its main crystallographic axis(armchair orientation).By fitting the experimental PSHG images of sub-micron resolution into a generalized nonlinear model,we are able to determine the armchair orientation for every pixel of the image of the 2D material,with further improved resolution.This pixel-wise mapping of the armchair orientation of 2D WS2 allows us to distinguish between different domains,reveal fine structure,and estimate the crystal orientation variability,which can be used as a unique crystal quality marker over large areas.The necessity and superiority of a polarization-resolved analysis over intensity-only measurements is experimentally demonstrated,while the advantages of PSHG over other techniques are analysed and discussed. 展开更多
关键词 nonlinear imaging of 2D materials crystal orientation mapping crystal quality marker polarization-resolved second-harmonic generation atomically thin transition metal dichalcogenides graphene-related materials
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Review on second-harmonic generation of ultrasonic guided waves in solid media(Ⅰ): Theoretical analyses 被引量:1
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作者 李卫彬 邓明晰 项延训 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第11期51-65,共15页
Considering the high sensitivity of the nonlinear ultrasonic measurement technique and great advantages of the guided wave testing method, the use of nonlinear ultrasonic guided waves provides a promising means for ev... Considering the high sensitivity of the nonlinear ultrasonic measurement technique and great advantages of the guided wave testing method, the use of nonlinear ultrasonic guided waves provides a promising means for evaluating and characterizing the hidden and/or inaccessible damage/degradation in solid media. Increasing attention on the development of the testing method based on nonlinear ultrasonic guided waves is largely attributed to the theoretical advances of nonlinear guided waves propagation in solid media. One of the typical acoustic nonlinear responses is the generation of second harmonics that can be used to effectively evaluate damage/degradation in materials/structures. In this paper, the theoretical progress of second-harmonic generation(SHG) of ultrasonic guided wave propagation in solid media is reviewed. The advances and developments of theoretical investigations on the effect of SHG of ultrasonic guided wave propagation in different structures are addressed. Some obscure understandings and the ideas in dispute are also discussed. 展开更多
关键词 second-harmonic generation(SHG) ultrasonic guided waves cumulative growth effect phase and group velocity matching
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Analysis of second-harmonic generation microscopy under refractive index mismatch
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作者 王湘晖 林列 张杨 《Chinese Physics B》 SCIE EI CAS CSCD 2007年第11期3285-3289,共5页
On the basis of the vector diffraction theory and Green's function method, this paper investigates the effects of refractive index mismatch on second-harmonic generation (SHG) microscopy. The polarization distribut... On the basis of the vector diffraction theory and Green's function method, this paper investigates the effects of refractive index mismatch on second-harmonic generation (SHG) microscopy. The polarization distribution and SHG intensity are calculated as functions of the sample radius and probe depth. The numerical results show that refractive index mismatch can result in peak intensity degradation, increase secondary lobes and extension of second- harmonic polarization distribution. Because of the attenuation of polarization intensity, the detected SHG intensity significantly decreases with increasing probe depth, which can limit the imaging depth of SHG microscopy inside thick samples. Forward SHG intensity decays slowly than backward SHG, due to the combination of extension second-harmonic polarization distribution and strong dependency of forward SHG on sample radius. 展开更多
关键词 MICROSCOPY second-harmonic generation POLARIZATION refractive index mismatch
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Optical second-harmonic generation of Janus MoSSe monolayer
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作者 Ce Bian Jianwei Shi +3 位作者 Xinfeng Liu Yang Yang Haitao Yang Hongjun Gao 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第9期488-492,共5页
The transition metal dichalcogenides(TMD)monolayers have shown strong second-harmonic generation(SHG)ow-ing to their lack of inversion symmetry.These ultrathin layers then serve as the frequency converters that can be... The transition metal dichalcogenides(TMD)monolayers have shown strong second-harmonic generation(SHG)ow-ing to their lack of inversion symmetry.These ultrathin layers then serve as the frequency converters that can be intergraded on a chip.Here,taking MoSSe as an example,we report the first detailed experimental study of the SHG of Janus TMD monolayer,in which the transition metal layer is sandwiched by the two distinct chalcogen layers.It is shown that the SHG effectively arises from an in-plane second-harmonic polarization under paraxial focusing and detection.Based on this,the orientation-resolved SHG spectroscopy is realized to readily determine the zigzag and armchair axes of the Janus crystal with an accuracy better than±0.6°.Moreover,the SHG intensity is wavelength-dependent and can be greatly enhanced(~60 times)when the two-photon transition is resonant with the C-exciton state.Our findings uncover the SHG properties of Janus MoSSe monolayer,therefore lay the basis for its integrated frequency-doubling applications. 展开更多
关键词 Janus MoSSe monolayer second-harmonic generation(SHG) orientation-resolved spectroscopy C-exciton resonance
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Phase Effects at Second-Harmonic Generation in ZnO/PMMA Nanocomposite Films
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作者 Rena J. Kasumova H. M. Mamedov S. H. A. Shamilova 《Journal of Physical Science and Application》 2017年第5期48-58,共11页
In this paper analysis of constant-intensity approximation of nonlinear interaction of the second-harmonic generation in ZnO/PMMA nanocomposite films for different concentrations of ZnO was carried out with regard to ... In this paper analysis of constant-intensity approximation of nonlinear interaction of the second-harmonic generation in ZnO/PMMA nanocomposite films for different concentrations of ZnO was carried out with regard to the losses and phase changes of all the interacting waves. The investigated samples were manufactured on the basis of ZnO nanoparticles embedded into polyvinylchloride polymeric matrix (PMMA) by the method of electrochemical deposition. The main goal of work is the exploration of the ZnO morphology and parameters of the second order susceptibilities. It is verified that the surface effects in ZnO/PMMA structures will give a larger contribution than the volume effects. The factors restricting the efficiency of the process of frequency conversion have been analyzed. 展开更多
关键词 Nanocomposite film POLYVINYLCHLORIDE second-harmonic generation constant-intensity approximation frequencyconversion.
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Flat-top beam illumination for polarization-sensitive second-harmonic generation microscopy
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作者 Bing Wang Xiang Li +4 位作者 Wenhui Yu Binglin Shen Rui Hu Junle Qu Liwei Liu 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第6期164-169,共6页
Wide-field second-harmonic generation (SHG) was used to obtain the second-harmonic signal from the entire image area for rapid imaging, despite the fact that conventional Gaussian beam illumination has low energy util... Wide-field second-harmonic generation (SHG) was used to obtain the second-harmonic signal from the entire image area for rapid imaging, despite the fact that conventional Gaussian beam illumination has low energy utilization efficiency,which makes it easy to overexpose the intensity of the image center area. However, flat-top beam illumination has uniform spatial distribution, thereby improving the photon excitation efficiency in the entire image region and reducing laser damage and thermal effect. By combining flat-top beam illumination and wide-field SHG polarization measurement, we can calculate more myosin fibril symmetrical axis orientations through polarization analysis of 16 images at a fast imaging speed while expanding the field of view. More importantly, the application of a flat-top beam can further improve the capability of polarization measurement in SHG microscopy. 展开更多
关键词 flat-top beam second-harmonic generation muscle structure
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Ultrabroadband second-harmonic generation via spatiotemporal-coupled phase matching
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作者 陶昱东 朱文涛 +6 位作者 章艳芳 马金贵 王静 袁鹏 张浩 朱鹤元 钱列加 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第1期105-112,共8页
We propose a spatially chirped quasi-phase-matching(QPM)scheme that enables ultrabroadband second-harmonic-generation(SHG)by using a fan-out QPM grating to frequency-convert a spatially chirped fundamental wave.A“zer... We propose a spatially chirped quasi-phase-matching(QPM)scheme that enables ultrabroadband second-harmonic-generation(SHG)by using a fan-out QPM grating to frequency-convert a spatially chirped fundamental wave.A“zerodispersion”4f system maps the spectral contents of ultrabroadband fundamental onto different spatial coordinates in the Fourier plane,where the fundamental is quasi-monochromatic locally in picosecond duration,fundamentally canceling high-order phase mismatch.A fan-out QPM grating characterized by a linear variation of the poling period along the transverse direction exactly supports the QPM of the spatially chirped beam.We theoretically demonstrate the SHG of an 810-nm,12.1-fs pulse into a 405-nm,10.2-fs pulse with a conversion efficiency of 77%. 展开更多
关键词 nonlinear optics second-harmonic generation few-cycle pulse
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Broadband second-harmonic generation in thin-film lithium niobate microdisk via cyclic quasi-phase matching
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作者 朱杰夫 丁婷婷 +5 位作者 孙雪芮 倪枫超 黎浩 刘时杰 郑远林 陈险峰 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第3期118-122,共5页
Whispering-gallery-mode(WGM)microresonators can greatly enhance light-matter interaction,making them indispensable units for frequency conversion in nonlinear optics.Efficient nonlinear wave mixing in microresonators ... Whispering-gallery-mode(WGM)microresonators can greatly enhance light-matter interaction,making them indispensable units for frequency conversion in nonlinear optics.Efficient nonlinear wave mixing in microresonators requires stringent simultaneous optical resonance and phase-matching conditions.Thus,it is challenging to achieve efficient frequency conversion over a broad bandwidth.Here,we demonstrate broadband second-harmonic generation(SHG)in the x-cut thinfilm lithium niobate(TFLN)microdisk with a quality factor above 107by applying the cyclic quasi-phase-matching(CQPM)mechanism,which is intrinsically applicable for broadband operation.Broadband SHG of continuous-wave laser with a maximum normalized conversion efficiency of~15%/m W is achieved with a bandwidth spanning over 100 nm in the telecommunication band.Furthermore,broadband SHG of femtosecond lasers,supercontinuum lasers,and amplified spontaneous emission in the telecommunication band is also experimentally observed.The work is beneficial for integrated nonlinear photonics devices like frequency converters and optical frequency comb generator based on second-order nonlinearity on the TFLN platform. 展开更多
关键词 lithium niobate whispering-gallery mode broadband second-harmonic generation cyclic quasi-phase matching
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Second-harmonic generation in periodic fork-shaped χ^((2)) gratings at oblique incidence
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作者 盛艳 刘山 +4 位作者 胡效康 陈鑫 徐天翔 赵如薇 Wieslaw Kroli kowski 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第4期101-105,共5页
Three-dimensional(3D) nonlinear photonic crystals have received intensive interest as an ideal platform to study nonlinear wave interactions and explore their applications. Periodic fork-shaped gratings are extremely ... Three-dimensional(3D) nonlinear photonic crystals have received intensive interest as an ideal platform to study nonlinear wave interactions and explore their applications. Periodic fork-shaped gratings are extremely important in this context because they are capable of generating second-harmonic vortex beams from a fundamental Gaussian wave, which has versatile applications in optical trapping and materials engineering. However, previous studies mainly focused on the normal incidence of the fundamental Gaussian beam, resulting in symmetric emissions of the second-harmonic vortices. Here we present an experimental study on second-harmonic vortex generation in periodic fork-shaped gratings at oblique incidence, in comparison with the case of normal incidence. More quasi-phase-matching resonant wavelengths have been observed at oblique incidence, and the second-harmonic emissions become asymmetric against the incident beam.These results agree well with theoretic explanations. The oblique incidence of the fundamental wave is also used for the generation of second-harmonic Bessel beams with uniform azimuthal intensity distributions. Our study is important for a deeper understanding of nonlinear interactions in a 3D periodic medium. It also paves the way toward achieving highquality structured beams at new frequencies, which is important for manipulation of the orbital angular momentum of light. 展开更多
关键词 second-harmonic generation nonlinear photonic crystal periodically poled ferroelectric crystal quasi-phase matching nonlinear wavefront shaping
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On-chip ultraviolet second-harmonic generation in lithium-tantalate thin film microdisk 被引量:1
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作者 薛苗 颜雄硕 +4 位作者 吴江威 葛睿 袁汀格 陈玉萍 陈险峰 《Chinese Optics Letters》 SCIE EI CAS CSCD 2023年第6期89-93,共5页
The compact and reliable ultraviolet[UV]source has attracted remarkable attention for its potential use in optical measurement systems,high-density optical storage,and biomedical applications.We demonstrate ultraviole... The compact and reliable ultraviolet[UV]source has attracted remarkable attention for its potential use in optical measurement systems,high-density optical storage,and biomedical applications.We demonstrate ultraviolet generation by frequency doubling in a lithium-tantalate-on-insulator[LTOI]microdisk via modal phase matching.The 50-μm-diameter microdisk was milled by a focused ion beam[FIB]and followed by chemo-mechanical polishing[CMP]to smooth the disk surface and edge,and the Q-factor reaches 2.74×10~5in the visible band.On-chip UV coherent light with a wavelength of384.3 nm was achieved,which shows great promise for using LTOIs in integrated ultraviolet source platforms. 展开更多
关键词 lithium-tantalate thin film ultraviolet light second-harmonic generation
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Doubly resonant second-harmonic generation in a fiber-based tunable open microcavity
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作者 孔欣航 刘卓俊 +5 位作者 宋丽军 邱贵鑫 王栩莹 马剑涛 魏敦钊 刘进 《Chinese Optics Letters》 SCIE EI CAS CSCD 2023年第11期111-117,共7页
Microcavities constructed from materials with a second-order nonlinear coefficient have enabled efficient second-harmonic(SH)generation at a low power level.However,it is still technically challenging to realize doubl... Microcavities constructed from materials with a second-order nonlinear coefficient have enabled efficient second-harmonic(SH)generation at a low power level.However,it is still technically challenging to realize double resonance with large nonlinear modal overlap in a microcavity.Here,we propose a design for a robust,tunable,and easy coupling double-resonance SH generation based on the combination of a newly developed fiber-based Fabry-Perot microcavity and a sandwich structure,whose numerical SH conversion efficiency is up to 3000%W^(-1).This proposal provides a feasible way to construct ultra-efficient nonlinear devices for generation of classical and quantum light sources. 展开更多
关键词 MICROCAVITY double resonance second-harmonic generation
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