We demonstrated a Kerr-lens mode-locked polycrystalline Cr：ZnS laser pumped by a narrow-linewidth linearpolarised monolithic Er：YAG nonplanar ring oscillator operated at 1645 nm. With a 5-mm-thick sapphire plate for...We demonstrated a Kerr-lens mode-locked polycrystalline Cr：ZnS laser pumped by a narrow-linewidth linearpolarised monolithic Er：YAG nonplanar ring oscillator operated at 1645 nm. With a 5-mm-thick sapphire plate for intracavity dispersion compensation, a compact and stable Kerr-lens mode-locking operation was realised. The oscillator delivered 125-fs pulses at 2347 nm with an average power of 80 m W. Owing to the special polycrystalline structure of the Cr：ZnS crystal, the second to fourth harmonic generation was observed by random quasi-phase-matching.展开更多
Output performance of a continuous-wave TIn：YAP laser pumped passively Q-switched Ho：YLF laser is demon- strated with a polycrystalline Cr2＋ ：ZnS as the saturable absorber. We compare the experimental results at t...Output performance of a continuous-wave TIn：YAP laser pumped passively Q-switched Ho：YLF laser is demon- strated with a polycrystalline Cr2＋ ：ZnS as the saturable absorber. We compare the experimental results at the three different distances L of the polycrystalline Cr2＋ ：ZnS saturable absorber to the output coupler. The pulse width almost remains constant for different L, when the incident pump power is changed in the range of 7.9 27.1 W. The shortest pulse duration of 33.3 ns for L = 105 mm and the highest average output power of 6.8 W for L = 5 mm are obtMned at the incident pump power of 27.1 W. The output wavelength of the passively Q-switched laser shifts to 2045.2nm from 2064.7nm in the cw operation. The beam quality factor of M2 is 1.2.展开更多
Zinc sulfide photocatalysts doped with chromium (1:1)% were synthesized via precipitation technique. Their characteristics were studied by X-ray diffraction (XRD), AFM and Florescence spectrometer. The photocatalytic ...Zinc sulfide photocatalysts doped with chromium (1:1)% were synthesized via precipitation technique. Their characteristics were studied by X-ray diffraction (XRD), AFM and Florescence spectrometer. The photocatalytic reaction was applied under light intensity equal to 1.45 × 10-7 Einstein mol-1 to investigate the kinetics and thermodynamic parameters for photo-decolorization of reactive black 5 dye in collide solution of bare and Cr-doped ZnS. The mean crystal size and particle size for bare ZnS are more than those values for prepared Cr loaded ZnS.展开更多
The structural characteristics and optical and electrical properties of molecular-beam-epitaxy (MBE) grown ZnS0.8Se0.2 thin films on indium-tin-oxide (ITO) glass substrates were investigated in this work. The X-ray di...The structural characteristics and optical and electrical properties of molecular-beam-epitaxy (MBE) grown ZnS0.8Se0.2 thin films on indium-tin-oxide (ITO) glass substrates were investigated in this work. The X-ray diffraction (XRD) results indicated that high quality polycrystalline ZnS0.8Se0.2 thin film grown at the optimized temperature had a preferred orientation along the (111) planes. The transmission electron microscopy (TEM) cross-sectional micrograph of the sample showed a well defined columnar structure with lateral crystal dimension in the order of a few hundred angstroms. Ultraviolet(UV) photoresponsivity as high as 0.01 A/W had been demonstrated and for wavelengths longer than 450 nm, the response was down from the peak response by more than 3 orders of magnitude. The thin ZnS0.8Se0,2 photosensor layer, with a wide energy gap and anisotropic electrical property, makes a transmission UV liquid crystal light valve (LCLV) with high resolution feasible.展开更多
We report a cw Tm：YAP laser resonantly pumped Ho：LuV04 laser in passively Q-switched （PQS） mode with Cr2＋ ：ZnS as a saturable absorber （SA）. The influence of different transmittances of the output coupler on l...We report a cw Tm：YAP laser resonantly pumped Ho：LuV04 laser in passively Q-switched （PQS） mode with Cr2＋ ：ZnS as a saturable absorber （SA）. The influence of different transmittances of the output coupler on laser output performance is analyzed. With T = 50%, the max/mum PQS average output power of 2.3 W is ob- tained, corresponding to the slope efficiency and the optical-optical conversion efficiency are 35.1% and 19.8%, respectively. Also, the minimum pulse width of 100ns is achieved at the maximum pulse repetition frequency of 34.2kHz. When the maximum cw output power is 2.7W, the beam quality factor of the horizontal direc- tion Mx2 = 1.04 and the vertical direction M2 = 1.10 are obtained. In addition, the central wavelength of the laser output remains to be 2057.5nm with the output coupler transmittances of 50% and 60% in both cw and PQS operations. The results show that the Cr2＋：ZnS can be used as an SA in a Ho：LuVO4 laser around 2-μm wavelength.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.61205130,61465012,and 61564008)
文摘We demonstrated a Kerr-lens mode-locked polycrystalline Cr：ZnS laser pumped by a narrow-linewidth linearpolarised monolithic Er：YAG nonplanar ring oscillator operated at 1645 nm. With a 5-mm-thick sapphire plate for intracavity dispersion compensation, a compact and stable Kerr-lens mode-locking operation was realised. The oscillator delivered 125-fs pulses at 2347 nm with an average power of 80 m W. Owing to the special polycrystalline structure of the Cr：ZnS crystal, the second to fourth harmonic generation was observed by random quasi-phase-matching.
基金Supported by the National Natural Science Foundation of China under Grant Nos 61308009,61405047,and 50990301the Postdoctoral Science Foundation of China under Grant No 2013M540288+1 种基金the Fundamental Research Funds for the Central Universities under Grant Nos HIT.NSRIF.2014044 and HIT.NSRIF.2015042the Science Fund for Outstanding Youths of Heilongjiang Province under Grant No JQ201310
文摘Output performance of a continuous-wave TIn：YAP laser pumped passively Q-switched Ho：YLF laser is demon- strated with a polycrystalline Cr2＋ ：ZnS as the saturable absorber. We compare the experimental results at the three different distances L of the polycrystalline Cr2＋ ：ZnS saturable absorber to the output coupler. The pulse width almost remains constant for different L, when the incident pump power is changed in the range of 7.9 27.1 W. The shortest pulse duration of 33.3 ns for L = 105 mm and the highest average output power of 6.8 W for L = 5 mm are obtMned at the incident pump power of 27.1 W. The output wavelength of the passively Q-switched laser shifts to 2045.2nm from 2064.7nm in the cw operation. The beam quality factor of M2 is 1.2.
文摘Zinc sulfide photocatalysts doped with chromium (1:1)% were synthesized via precipitation technique. Their characteristics were studied by X-ray diffraction (XRD), AFM and Florescence spectrometer. The photocatalytic reaction was applied under light intensity equal to 1.45 × 10-7 Einstein mol-1 to investigate the kinetics and thermodynamic parameters for photo-decolorization of reactive black 5 dye in collide solution of bare and Cr-doped ZnS. The mean crystal size and particle size for bare ZnS are more than those values for prepared Cr loaded ZnS.
基金Project supported by the National Natural Science Foundation of China (No. 59910161981) and RGC grant from the Hong Kong Government Grant (No. NSFC/HKUST 35) China
文摘The structural characteristics and optical and electrical properties of molecular-beam-epitaxy (MBE) grown ZnS0.8Se0.2 thin films on indium-tin-oxide (ITO) glass substrates were investigated in this work. The X-ray diffraction (XRD) results indicated that high quality polycrystalline ZnS0.8Se0.2 thin film grown at the optimized temperature had a preferred orientation along the (111) planes. The transmission electron microscopy (TEM) cross-sectional micrograph of the sample showed a well defined columnar structure with lateral crystal dimension in the order of a few hundred angstroms. Ultraviolet(UV) photoresponsivity as high as 0.01 A/W had been demonstrated and for wavelengths longer than 450 nm, the response was down from the peak response by more than 3 orders of magnitude. The thin ZnS0.8Se0,2 photosensor layer, with a wide energy gap and anisotropic electrical property, makes a transmission UV liquid crystal light valve (LCLV) with high resolution feasible.
基金Supported by the National Natural Science Foundation of China under Grant Nos 61308009,61405047 and 50990301the China Postdoctoral Science Foundation Funded Project under Grant No 2013M540288+2 种基金the Fundamental Research Funds for the Central Universities under Grant Nos HIT.NSRIF.2014044 and HIT.NSRIF.2015042the Science Fund for Outstanding Youths of Heilongjiang Province under Grant No JQ201310the Natural Science Foundation of Heilongjiang Province under Grant No LBH-Z14085
文摘We report a cw Tm：YAP laser resonantly pumped Ho：LuV04 laser in passively Q-switched （PQS） mode with Cr2＋ ：ZnS as a saturable absorber （SA）. The influence of different transmittances of the output coupler on laser output performance is analyzed. With T = 50%, the max/mum PQS average output power of 2.3 W is ob- tained, corresponding to the slope efficiency and the optical-optical conversion efficiency are 35.1% and 19.8%, respectively. Also, the minimum pulse width of 100ns is achieved at the maximum pulse repetition frequency of 34.2kHz. When the maximum cw output power is 2.7W, the beam quality factor of the horizontal direc- tion Mx2 = 1.04 and the vertical direction M2 = 1.10 are obtained. In addition, the central wavelength of the laser output remains to be 2057.5nm with the output coupler transmittances of 50% and 60% in both cw and PQS operations. The results show that the Cr2＋：ZnS can be used as an SA in a Ho：LuVO4 laser around 2-μm wavelength.
