中国激光, 2009, 36 (7): 1727, 网络出版: 2009-07-16
可调谐掺铥光纤激光器共振抽运的HoYLF固体激光器
Efficient HoYLF Laser Pumped by Tunable Tm-Doped Fiber Laser
激光器 光纤-体块混合固体激光器 双包层掺Tm光纤激光器 可调谐 HoYLF晶体 lasers hybrid fiber-bulk laser cladding-pumped Tm-doped fiber laser tunable HoYLF crystal
摘要
用包层抽运的宽带可调谐掺Tm光纤激光作为抽运源研究了HoYLF 2 μm固体激光输出特性。利用光纤激光共振抽运固体激光增益介质的光纤-体块混合激光器技术可使得大部分热量产生于光纤中, 体块激光介质中只有很少的量子亏损热, 有效地降低了热产生, 有利于实现高功率、高效率的2 μm激光输出。研究了不同抽运波长下Ho:YLF激光的输出特性, 并与激光晶体的吸收光谱进行对比, 对最佳抽运波长与晶体吸收峰不一致的现象进行了分析。在最佳抽运波长下, 当抽运功率为9.4 W时, 得到5.3 W近衍射极限的TEM00模线偏振光输出, 激光中心波长2066 nm, 光束质量因子M2约为1.1, 斜率效率达到70%。
Abstract
The output characteristic of a novel hybrid fiber-bulk laser, demonstrated with a cladding-pumped tunable Tm-doped silica fiber laser as the pump source and HoYLF as the laser crystal,is researched. Most of the heat generated via quantum defect heating in this fiber-bulk laser scheme is deposited in the fiber, and thermal effects in the bulk laser are dramatically reduced leading to the prospect of much improved efficiency, beam quality and higher output power in the 2 μm wavelength regime. Output characteristics under different pumping wavelength were experimentally studied, and it was found that the best pumping wavelength was a few nanometers off the absorption peak. Using a simple two-mirror resonator configuration,a 5.3 W polarized output is obtained at 2066 nm in a diffraction-limited TEM00 beam (with M2 of about 1.1) for 9.4 W incident pump power, corresponding to a slope efficiency of 70%.
王飞, 沈德元, 范滇元, 陆启生. 可调谐掺铥光纤激光器共振抽运的HoYLF固体激光器[J]. 中国激光, 2009, 36(7): 1727. Wang Fei, Shen Deyuan, Fan Dianyuan, Lu Qisheng. Efficient HoYLF Laser Pumped by Tunable Tm-Doped Fiber Laser[J]. Chinese Journal of Lasers, 2009, 36(7): 1727.