Ultra-compact >100kHz Q-switched Alexandrite lasers

Ultra-compact >100kHz Q-switched Alexandrite lasers
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超紧凑 >100kHz 调Q 紫翠玉激光器

DOI:
10.1117/12.2545031
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发表时间:
2020
期刊:
--
影响因子:
--
通讯作者:
Tawy G
Tawy G
中科院分区:
--
文献类型:
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作者:
Tawy G

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我们报道了采用超紧凑型系统在自调Q(SQS)运转的紫翠宝石激光器的<100 kHz连续波二极管泵浦。激光器的平均功率为1:46W,斜率效率为49%,M2≤为1.2W。在138kHz处获得了657 ns的脉冲宽度,相应的脉冲能量和峰值功率分别为9.6μJ和14.6W。给出了与激光功率、光谱和时间分布有关的详细结果。文中还给出了脉冲稳定性与泵浦功率和晶体温度的关系。SQS机制归因于粒子数反转密度的折射率随时间的变化,从而产生随时间变化的粒子数透镜。在另一项单独的研究中,我们得到了引起折射率变化的激发态和基态的极化率变化的值。结果表明,这与之前对紫翠宝石的测量结果一致,对其他掺铬增益介质的测量范围内也观察到了SQS。
We report <100 kHz continuous wave diode pumping of Alexandrite lasers in self-Q-switched (SQS) operation using an ultra-compact system. The laser had up to 1:46W of average power with slope efficiency of 49% and M2≤ 1.2. A pulse duration of 657 ns at 138 kHz is obtained, with a corresponding pulse energy and peak power of 9.6 μJ and 14.6 W, respectively. Detailed results related to the laser power, spectrum and temporal profile are provided. A description of the pulse stability with respect to pump power and crystal temperature is also shown. The SQS mechanism is attributed to a time-dependent variation in the refractive index of the population inversion density giving rise to a time-dependent population lens. In a separate study we obtain the value for the variation in polarizability of the excited and ground state that gives rise to the refractive index variation. It is found to be in good agreement with a prior measurement for Alexandrite and in the range measured for other Chromium-doped gain media for which SQS has also been observed.
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