阐述了一种获得高功率3~5μm中红外激光输出的实验方案,即先通过高功率1.94μm光源抽运Ho：YLF晶体,获得高重复频率2.05μm激光输出,通过端抽运放大方式,提升2.05μm激光功率水平,最终2.05μm激光抽运光参量振荡器（OPO）实现高功率中...阐述了一种获得高功率3~5μm中红外激光输出的实验方案,即先通过高功率1.94μm光源抽运Ho：YLF晶体,获得高重复频率2.05μm激光输出,通过端抽运放大方式,提升2.05μm激光功率水平,最终2.05μm激光抽运光参量振荡器（OPO）实现高功率中波激光输出。在水冷工作体制下获得了重复频率5 k Hz、最大功率26.9 W的中波输出,脉冲宽度为24.4 ns,2.05μm到3~5μm的光光转换效率达50%,通过角度调谐获得不同波长的中红外激光输出,验证了该实验方案作为一种获得高功率、高效率、高重复频率中红外激光输出工作方式的可行性。展开更多
A diode-pumped single frequcncy Tm,Ho：YLF laser operating at an eye-safe wavelength of 2 μm has been developed. Temperature of the laser crystal was controlled at room temperature with a thermoelectric cooler. The l...A diode-pumped single frequcncy Tm,Ho：YLF laser operating at an eye-safe wavelength of 2 μm has been developed. Temperature of the laser crystal was controlled at room temperature with a thermoelectric cooler. The line-width narrowing elements were two solid uncoated fused silica etalons whose thicknesses were 1 and 0.1 mm, respectively. Continuous wave single frequency power of 113 mW was obtained.展开更多
A simple rate equation model for 2μm Tm,Ho:YLF laser is given to study laser dynamics. Under low pump power, the explicit formulae for the threshold pump power and the relation between output power and incident power...A simple rate equation model for 2μm Tm,Ho:YLF laser is given to study laser dynamics. Under low pump power, the explicit formulae for the threshold pump power and the relation between output power and incident power are obtained. The present model provides a straightforward procedure to design the laser resonator and the optical coupling system for optimization. At the same time, the experimental results are reported. At room temperature the slope efficiency is 22.4% and the typical lasing threshold is about 328mW. The theory is in good agreement with experiment.展开更多
A single-frequency pulsed holmium-doped yttrium lithium fluoride(Ho:YLF)amplifier pumped by a Tm-doped fiber laser was demonstrated.The seed was an injection-seeded Q-switched Ho:YLF laser.The output energy from the s...A single-frequency pulsed holmium-doped yttrium lithium fluoride(Ho:YLF)amplifier pumped by a Tm-doped fiber laser was demonstrated.The seed was an injection-seeded Q-switched Ho:YLF laser.The output energy from the singlefrequency pulsed amplifier was 24.2 mJ,with a pulse width of 250 ns at a pulse repetition frequency(PRF)of 100 Hz.The energy stability during 30 min was improved to 1%after the single-frequency pulsed Ho:YLF laser was amplified.The line width of the single-frequency pulsed spectrum of the Ho:YLF amplifier was 2.81 MHz.The single-frequency pulsed Ho:YLF amplifier can be applied to differential absorption lidar(DIAL),since its output spectrum is around the P12 CO2 absorption line.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
文摘阐述了一种获得高功率3~5μm中红外激光输出的实验方案,即先通过高功率1.94μm光源抽运Ho：YLF晶体,获得高重复频率2.05μm激光输出,通过端抽运放大方式,提升2.05μm激光功率水平,最终2.05μm激光抽运光参量振荡器（OPO）实现高功率中波激光输出。在水冷工作体制下获得了重复频率5 k Hz、最大功率26.9 W的中波输出,脉冲宽度为24.4 ns,2.05μm到3~5μm的光光转换效率达50%,通过角度调谐获得不同波长的中红外激光输出,验证了该实验方案作为一种获得高功率、高效率、高重复频率中红外激光输出工作方式的可行性。
基金This work was supported by the Scientic Re-search Foundation of Harbin Engineering Univer-sity (HEUF04014)
文摘A diode-pumped single frequcncy Tm,Ho：YLF laser operating at an eye-safe wavelength of 2 μm has been developed. Temperature of the laser crystal was controlled at room temperature with a thermoelectric cooler. The line-width narrowing elements were two solid uncoated fused silica etalons whose thicknesses were 1 and 0.1 mm, respectively. Continuous wave single frequency power of 113 mW was obtained.
文摘A simple rate equation model for 2μm Tm,Ho:YLF laser is given to study laser dynamics. Under low pump power, the explicit formulae for the threshold pump power and the relation between output power and incident power are obtained. The present model provides a straightforward procedure to design the laser resonator and the optical coupling system for optimization. At the same time, the experimental results are reported. At room temperature the slope efficiency is 22.4% and the typical lasing threshold is about 328mW. The theory is in good agreement with experiment.
基金supported by the National Natural Science Foundation of China(No.51572053)。
文摘A single-frequency pulsed holmium-doped yttrium lithium fluoride(Ho:YLF)amplifier pumped by a Tm-doped fiber laser was demonstrated.The seed was an injection-seeded Q-switched Ho:YLF laser.The output energy from the singlefrequency pulsed amplifier was 24.2 mJ,with a pulse width of 250 ns at a pulse repetition frequency(PRF)of 100 Hz.The energy stability during 30 min was improved to 1%after the single-frequency pulsed Ho:YLF laser was amplified.The line width of the single-frequency pulsed spectrum of the Ho:YLF amplifier was 2.81 MHz.The single-frequency pulsed Ho:YLF amplifier can be applied to differential absorption lidar(DIAL),since its output spectrum is around the P12 CO2 absorption line.
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.
