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用半导体激光器抽运的调QYLF倍频激光器抽运掺钛蓝宝石激光器 ,用LBO晶体在腔内产生二次谐波 ,再聚焦到BBO晶体上产生四次谐波深紫外激光。为了提高谐波转换效率 ,在腔内分别插入了单片、组合双折射滤光片和聚焦透镜 ,在平均功率为 3.6W ,波长为 5 2 7nm的抽运光下得到 4 10mW ,4 17nm的蓝光。用长焦距的透镜聚焦二次谐波 ,得到 34mW ,2 0 8nm的紫外脉冲激光。从实验上详细研究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产生效率的影响。全面地分析了单片和组合双折射滤光片及抽运功率对钛宝石激光器基频光的脉宽、线宽等参量的影响。
Tuning QYLF double-frequency laser pumped by a semiconductor laser pumped titanium-doped sapphire laser, LBO crystal in the cavity to produce the second harmonic, and then focus on the BBO crystal to produce the fourth harmonic deep UV laser. In order to improve the harmonic conversion efficiency, a single piece, a combination of a birefringent filter and a focusing lens are respectively inserted into the cavity, and under the pumping power with an average power of 3.6W and a wavelength of 5 2 7nm, 4 10mW and 4 17nm Blu-ray. Focusing the second harmonic wave with a lens with a long focal length, a pulsed laser with a wavelength of 34 mW and 280 nm is obtained. The effect of the fundamental frequency of light on the second harmonic efficiency and the effect of the second harmonic linewidth on the fourth harmonic efficiency are studied experimentally in detail. The effect of the fundamental frequency light wavelength on the fourth harmonic generation efficiency influences. The effects of monolithic and combined birefringent filters and pumping power on parameters such as pulse width and linewidth of fundamental frequency of Ti: sapphire laser are analyzed comprehensively.