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报道了激光二极管(LD)双端面抽运Tm∶Ho∶GdVO4固体激光器,在2.049μm处获得连续(CW)和准连续(QCW)激光输出。激光二极管为光纤耦合输出,光纤芯径400μm,数值孔径0.22,输出波长805 nm。激光二极管额定输出功率27.7 W,均分为两束双端面抽运激光晶体。晶体尺寸为4 mm×4 mm×7 mm,Tm,Ho掺杂原子数分数分别为5%,0.5%。分析了Tm∶Ho能级系统的主要能级跃迁和能量转换损耗。为提高激光器的输出功率和转换效率,激光晶体采用液氮制冷。在重复频率5 kHz,10 kHz,20 kHz,调Q以及连续运行模式下,获得了9.4~10.1 W的激光输出,光-光转换效率为34%~36%。最大单脉冲能量为1.9 mJ,最大峰值功率为0.13 MW。讨论了抽运光功率和重复频率对激光脉宽的影响。
The laser diode (LD) double-end-pumped Tm: Ho: GdVO4 solid-state laser was reported, and CW and quasi-continuous (QCW) laser outputs were obtained at 2.049μm. The laser diode is a fiber-coupled output with a fiber core diameter of 400 μm, a numerical aperture of 0.22 and an output wavelength of 805 nm. Laser diode rated output power of 27.7 W, are divided into two beams of double-ended pump laser crystal. The crystal size is 4 mm × 4 mm × 7 mm. The fraction of Tm and Ho doping atoms is 5% and 0.5%, respectively. The main energy level transition and energy conversion loss of the TmHo energy system are analyzed. In order to improve the laser output power and conversion efficiency, laser crystal using liquid nitrogen refrigeration. The laser output is 9.4 ~ 10.1 W at repetition frequency of 5 kHz, 10 kHz, 20 kHz, Q-switched and continuous operation mode, and the light-to-light conversion efficiency is 34% -36%. The maximum single-pulse energy is 1.9 mJ and the maximum peak power is 0.13 MW. The influence of pumping power and repetition frequency on laser pulse width is discussed.