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Diode pumped, actively Q-switched thulium laser

机译：二极管泵浦，主动调Q ul激光器

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摘要

The properties of several Tm doped crystals regarding application in Q-switched tunable laser were analyzed theoretically. The acousto-optically Q-switched Tm:YLF laser is described in experimental part. The fiber coupled (0.4-mm core diameter) laser diode bar at 792-nm wavelength was deployed for pumping. The uncoated, with 3.5% dopant of thulium YLF rod of φ3×8mm size wrapped with indium foil was mounted in copper heat-sink maintaining 293 K temperature of coolant water. Above 6 W of output power and near 50% slope efficiency with respect to absorbed pump power was demonstrated in free-running mode for a short, 40-mm long resonator. The quartz acousto-optic modulator with above 80% diffraction efficiency for 25-W power of RF was taken as the Q-switch for such a laser. In the best case of Q-switching mode up to 2-mJ output energy with 15-ns pulse duration corresponding to 100-kW peak power was demonstrated for rep. rate of a few Hz. Emission wavelength was around 1904 nm for both free-running and Q-switching regimes.
机译：从理论上分析了几种Tm掺杂晶体在调Q可调激光器中的应用性能。实验部分介绍了声光调Q Tm：YLF激光器。部署了波长为792 nm的光纤耦合（芯直径为0.4 mm）激光二极管棒进行泵浦。将未涂覆的，掺杂有3.5％掺杂剂的Φ3×8mm尺寸的Φ3×8mm的Y YLF棒安装在保持293 K冷却水温度的铜散热器中。对于一个短的40mm长的谐振器，在自由运行模式下证明了高于6W的输出功率和接近50％的吸收泵浦功率斜率效率。对于25瓦的RF功率，具有80％以上衍射效率的石英声光调制器被用作此类激光器的Q开关。在Q开关模式的最佳情况下，对于rep来说，其输出能量高达2 mJ，脉冲持续时间为15 ns，对应于100 kW峰值功率。几赫兹的速率。对于自由运行和Q切换方案，发射波长均在1904 nm附近。

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