Opt Lett. 2018 Sep 15;43(18):4489-4492. doi: 10.1364/OL.43.004489.
We report, to the best of our knowledge, the first light-emitting diode (LED)-pumped Cr:LiSAF laser, in both quasi-continuous-wave (QCW) and passively Q-switched operation. This Letter is based on the recent development of LED-pumped luminescent concentrators (LCs). Combining the capacity of high-density integration of blue LEDs with the excellent properties of Ce:YAG LCs, this new pump source can deliver high irradiance (7.3 kW/cm) in the visible to pump Cr:LiSAF. The Cr:LiSAF laser demonstrates an energy of 8.4 mJ at 850 nm in QCW (250 μs pulses at 10 Hz). A small signal gain per roundtrip of 1.44 at 850 nm and a wavelength tunability between 810 and 960 nm have been performed. A passively Q-switched oscillator is also presented using a Cr:YAG saturable absorber. A peak power of 3.1 kW is obtained with a pulse energy of 130 μJ and duration of 41.6 ns.
据我们所知，我们首次报告了基于发光二极管（LED）泵浦的 Cr:LiSAF 激光，实现了连续和被动调 Q 两种工作模式。本研究基于近期开发的 LED 泵浦荧光体（LC）。将高功率密度蓝光 LED 的集成能力与 Ce:YAG LC 的优异性能相结合，这种新型泵浦源可以在可见光波段提供高辐照度（7.3kW/cm2），从而实现对 Cr:LiSAF 的有效泵浦。在连续波（250μs 脉冲，10Hz）模式下，Cr:LiSAF 激光在 850nm 处的输出能量为 8.4mJ。在 850nm 处，实现了 1.44 的每圈小信号增益和 810nm 到 960nm 的波长调谐。同时，我们还利用 Cr:YAG 可饱和吸收体演示了被动调 Q 振荡器。该振荡器获得了峰值功率为 3.1kW、脉冲能量为 130μJ、脉宽为 41.6ns 的脉冲输出。
