中国激光, 2004, 31 (7): 769, 网络出版: 2006-06-12
高效全固化钛宝石腔内倍频蓝光和四倍频紫外激光器的研究
High Efficient Second Harmonic at 416 nm and Fourth Harmonic Generation at 208 nm in Compacted All-Solid-State Ti∶Sapphire Laser
激光技术 钛宝石 腔内倍频 四次谐波 双折射滤光片 线宽 laser technique Ti∶sapphire intracavity doubling fourth harmonic generation birefringent filter linewidth
摘要
用半导体抽运的Q开关YLF倍频激光器抽运钛宝石晶体,在平凹腔内加入组合的石英双折射滤光片压缩线宽,用LBO晶体腔内激发二次谐波,聚焦到BBO上产生四次谐波深紫外光。在抽运功率3.8 W时,输出610 mW,416 nm蓝光。用长焦距的透镜聚焦二次谐波,得到64 mW,208 nm的紫外激光。基频光的谱线宽度是决定倍频效率的关键因素。实验观察到激光器的频谱宽度与双折射滤光片的带宽有一个数量级的差别,考虑到模式竞争和增益饱和效应,数值模拟了加入双折射滤光片后的钛宝石激光器的实际线宽,结果与实验中测量的数据基本一致。实验还分析了基频光的线宽对二次谐波效率的影响、二次谐波的线宽对四次谐波效率的影响、基频光的波长对四次谐波激发效率的影响。
Abstract
Second harmonic and fourth harmonic are generated from Ti∶sapphire laser pumped by a diode-Q-switched, doubling-frequency YLiF4 (YLF) laser at 527 nm. The nonlinear crystal LiB3O5 (LBO) is used to generate the second harmonic wave in the Ti∶sapphire cavity at Ⅰ-phase match with birefringent filter, and β-BaB2O4 (BBO) crystal is used to generate ultraviolet at 208 nm. Maximum average power of 610 mW at 416 nm, and 64 mW at 208 nm are obtained at 1 kHz repetition rate when the pumping power is 3.8 W. The high conversion efficiency is attributed to the birefringent filter which narrows the linewidth of Ti
程光华, 王屹山, 于连君, 程昭, 赵卫, 陈国夫. 高效全固化钛宝石腔内倍频蓝光和四倍频紫外激光器的研究[J]. 中国激光, 2004, 31(7): 769. 程光华, 王屹山, 于连君, 程昭, 赵卫, 陈国夫. High Efficient Second Harmonic at 416 nm and Fourth Harmonic Generation at 208 nm in Compacted All-Solid-State Ti∶Sapphire Laser[J]. Chinese Journal of Lasers, 2004, 31(7): 769.
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