本文通过求解薛定谔方程,理论探索了高次谐波及孤立阿秒脉冲在相位调制的单色中红外激光场中的产生.研究结果表明,通过加入含时相位啁啾小量,能够有效的提高高次谐波的产生效率,获得超宽平台谐波谱及超短孤立阿秒脉冲.特别是在相位为0....本文通过求解薛定谔方程,理论探索了高次谐波及孤立阿秒脉冲在相位调制的单色中红外激光场中的产生.研究结果表明,通过加入含时相位啁啾小量,能够有效的提高高次谐波的产生效率,获得超宽平台谐波谱及超短孤立阿秒脉冲.特别是在相位为0.3π的基础上,同时加入啁啾小量βt,在β=0.3时,可得到带宽为822 e V的超连续高次谐波平台.最后通过叠加第二平台高次谐波,可得到带宽仅为2.7 as的孤立阿秒脉冲.且脉冲强度比没有加入啁啾小量的情况下显著增强.展开更多
We propose an approach to generate optical triangular-shaped pulse train with tunable repetition rate using quadrupling radio frequency(RF)modulation and optical grating dispersion-induced power fading.In this work,a ...We propose an approach to generate optical triangular-shaped pulse train with tunable repetition rate using quadrupling radio frequency(RF)modulation and optical grating dispersion-induced power fading.In this work,a piece of chirped fiber Bragg grating(FBG)is employed as the dispersive media to remove the undesired 8th harmonic in optical intensity.Thus,the generated harmonics of optical intensity can be corresponding to the first two Fourier components of typical periodic triangular pulses.This work also analyzes the impacts of the extinction ratio and the bias voltage drift on the harmonic distortion suppression ratio.After that,the value of the extinction ratio and the range of the bias voltage drift can be obtained.The advantage of this proposal is that it can generate high order frequency-multiplexed optical pulses train which can be applied in all optical signal processing and other fields.展开更多
We propose a theoretical scheme to generate a broadband supercontinuum using a modulated chirped polarization gating technique. By this technique, a broadband continuum of 155 eV can be obtained at microscopic level. ...We propose a theoretical scheme to generate a broadband supercontinuum using a modulated chirped polarization gating technique. By this technique, a broadband continuum of 155 eV can be obtained at microscopic level. The modulations on the supercontinuum can be eliminated after propagation. Then a smooth broadband supercontinuum with the bandwidth of 155 eV can be generated. As a result, isolated sub-100-attosecond pulses with tunable central wavelengths could be obtained straightforwardly. Our simulations also reveal that an isolated attosecond pulse can still be generated by using multicycle driving laser pulses, and the central wave- length of isolated attosecond pulse can be controlled by adjusting the delay rj （ra is the delay of the two counter-rotating circularly polarized pulses.）.展开更多
文摘本文通过求解薛定谔方程,理论探索了高次谐波及孤立阿秒脉冲在相位调制的单色中红外激光场中的产生.研究结果表明,通过加入含时相位啁啾小量,能够有效的提高高次谐波的产生效率,获得超宽平台谐波谱及超短孤立阿秒脉冲.特别是在相位为0.3π的基础上,同时加入啁啾小量βt,在β=0.3时,可得到带宽为822 e V的超连续高次谐波平台.最后通过叠加第二平台高次谐波,可得到带宽仅为2.7 as的孤立阿秒脉冲.且脉冲强度比没有加入啁啾小量的情况下显著增强.
基金supported by the Fundamental Research Funds of the Central Universities(No.2015YJS004)
文摘We propose an approach to generate optical triangular-shaped pulse train with tunable repetition rate using quadrupling radio frequency(RF)modulation and optical grating dispersion-induced power fading.In this work,a piece of chirped fiber Bragg grating(FBG)is employed as the dispersive media to remove the undesired 8th harmonic in optical intensity.Thus,the generated harmonics of optical intensity can be corresponding to the first two Fourier components of typical periodic triangular pulses.This work also analyzes the impacts of the extinction ratio and the bias voltage drift on the harmonic distortion suppression ratio.After that,the value of the extinction ratio and the range of the bias voltage drift can be obtained.The advantage of this proposal is that it can generate high order frequency-multiplexed optical pulses train which can be applied in all optical signal processing and other fields.
基金supported by the National Natural Science Foundation of China (Grant Nos.91026021,11075068,10875054,11175076 and 10975065)the Fundamental Research Funds for the Central Universities(Grant No.lzujbky-2010-k08)Scholarship Award for Excellent Doctoral Students Granted by Ministry of Education
文摘We propose a theoretical scheme to generate a broadband supercontinuum using a modulated chirped polarization gating technique. By this technique, a broadband continuum of 155 eV can be obtained at microscopic level. The modulations on the supercontinuum can be eliminated after propagation. Then a smooth broadband supercontinuum with the bandwidth of 155 eV can be generated. As a result, isolated sub-100-attosecond pulses with tunable central wavelengths could be obtained straightforwardly. Our simulations also reveal that an isolated attosecond pulse can still be generated by using multicycle driving laser pulses, and the central wave- length of isolated attosecond pulse can be controlled by adjusting the delay rj （ra is the delay of the two counter-rotating circularly polarized pulses.）.
