高功率Q-開關紫外固態雷射的優化與製作

Optimization and Fabrication of High-Power Ultraviolet Q-switched Solid-State Laser

黃郁仁(Yu-Jen Huang) ； 唐政猷(Cheng-Yu Tang) ； 蘇冠暐(Kuan-Wei Su) ； 陳永富(Yung-Fu Chen)

《科儀新知》 182期 (2011/06) Pp. 42-51

https://doi.org/10.29662/IT.201106.0005

摘要

高功率紫外光雷射在基礎科學以及產業發展土占有不可或缺的角色。本文將針對高功率Q-開關紫外固態雷射的優化與製作進行詳細的介紹與探討。我們發現當激發功率越高時，寄生雷射的產生會使得Q-開關雷射的輸出性能明顯變差，為了有效抑制寄生雷射作用以及克服熱透鏡問題，利用摻釹濃度只有0.1%的Nd:YVO4晶體設計了一個輕巧簡便的高功率Q-開關雷射。按著採用此優化的高功率Q-開關雷射進行腔外二倍頻及三倍頻轉換，在脈衡重複率為40kHz以及輸入功率44W的情況下，532nm以及355nm所得到的最高輸出功率分別為8.38W以及6.65W。由808nm到355nm的光轉換效率達15.1%；而由1064nm到355nm的光轉換效率則達38.2%。

並列摘要

High-power ultraviolet laser plays an important role in a variety of scientific and industrial applications. In this report, optimization and fabrication of high-power ultraviolet Q-switched solid-state laser are introduced and investigated in detail. It is experimentally found that the parasitic lasing leads to the degradation of the actively Q-switched la ser in high-power operation. We manifestly confirm that the combined effects of the parasitic lasing and the thermal lensing made Nd: YVO4 crystals with 0.1 % dopant concentration to be more appropriate in designing a high-power Q-switched laser with a f1at-f1at cavity. We further use the optimized high-power actively Q-switched laser to perform the extra-cavity harmonic generations. At an incident pump power of 44 W, the output powers at 355 nm and 532 nm as high as 6.65 W and 8.38 W are obtained at a pulse repetition rate of 40 kHz. The optical-to-optical conversion efficiencies from 808 nm to 355 nm and from 1064 nm to 355 nm are found to be up to 15.1% and 38.2%, respectively