CAJ | 학술논문

激光二极管泵浦的Cr4+：YAG被动调Q微片激光器因其高重复频率、短脉宽、高峰值功率等优点，在光通信、激光雷达、遥感监测、非线性频率变换、激光微加工等领域有着重要应用，然而目前Cr4+：YAG被动调Q激光器脉冲输出稳定性较差，而且重复频率调谐范围窄，限制了其在气溶胶的荧光分析、测距以及空间光通信等领域中的广泛应用。实验中采用预泵浦方式，在激光二极管泵浦的Cr4+：YAG被动调Q微片激光器中获得重复频率连续可调、稳定振荡的激光脉冲输出，重复频率连续可调谐范围为2~28 kHz，其单脉冲能量的不稳定性优于±2.50%。其中，在重复频率为20 kHz时，获得脉冲宽度为2.431 ns，单脉冲能量17.6μJ，消光比252：1的脉冲输出，其幅度不稳定度约为4.00%，重复频率不稳定度约为2.40%。此类宽频可调、稳定振荡的激光二极管泵浦的Cr4+：YAG被动调Q微片激光器有着广阔的应用前景。
격광이겁관빙포적Cr4+：YAG피동조Q미편격광기인기고중복빈솔、단맥관、고봉치공솔등우점，재광통신、격광뢰체、요감감측、비선성빈솔변환、격광미가공등영역유착중요응용，연이목전Cr4+：YAG피동조Q격광기맥충수출은정성교차，이차중복빈솔조해범위착，한제료기재기용효적형광분석、측거이급공간광통신등영역중적엄범응용。실험중채용예빙포방식，재격광이겁관빙포적Cr4+：YAG피동조Q미편격광기중획득중복빈솔련속가조、은정진탕적격광맥충수출，중복빈솔련속가조해범위위2~28 kHz，기단맥충능량적불은정성우우±2.50%。기중，재중복빈솔위20 kHz시，획득맥충관도위2.431 ns，단맥충능량17.6μJ，소광비252：1적맥충수출，기폭도불은정도약위4.00%，중복빈솔불은정도약위2.40%。차류관빈가조、은정진탕적격광이겁관빙포적Cr4+：YAG피동조Q미편격광기유착엄활적응용전경。
Laser diode pumped microchip lasers passively Q-switched by Cr4+:YAG, with high repetition rate, short pulse width and high peak power, have important applications in optical communication, lidar, remote sensing, nonlinear frequency conversion, laser micro-processing and so on. However, in these lasers, the output stability is poor and the repetition rate of output laser cannot be changed widely. This will restrict the applications of these lasers in fluorescence analysis of aerosols or ranging, space optical communication. In the experiment, output pulses with continuously tunable repetition rate from 2 kHz to 28 kHz and stable oscillation were obtained in the laser diode pumped microchip laser passively Q-switched by Cr4+:YAG. In the stability of single pulse energy from 2 kHz to 28 kHz was less than ± 2.50%. Stable 2.431 ns pulse at 20 kHz with single pulse energy of 17.6μJ and extinction ratio of 252:1 and with amplitude instability of 4.00% and frequency instability of 2.40% was obtained. This laser diode pumped microchip laser passively Q-switched by Cr4+:YAG with wide continuously tunable repetition rate and stable oscillation will have broad application prospects.