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半导体抽运碱金属蒸气激光器(DPAL)在高能激光领域获得了快速发展,但碱金属原子吸收谱宽很窄,即使充入1.01×105Pa的缓冲气体如氦气或乙烷,其碰撞加宽也只有0.02～0.04nm,而市售大功率半导体激光器输出谱宽为2～4nm,难以实现有效抽运。采用Littman外腔结构压窄20W单宽面源大功率半导体激光器输出谱宽,实验获得了7.87W和谱宽小于0.1nm的窄线宽输出。将窄线宽输出激光通过80kPa乙烷、110℃的铷池,90%的抽运光被吸收,通过与理论模型对比推断半导体激光器的输出谱宽为30GHz。
Semiconductor pumped alkaline vapor lasers (DPALs) have gained momentum in the field of high-energy lasers, but the absorption spectrum of the alkali metal atoms is very narrow. Even with a buffer gas of 1.01 × 10 5 Pa, such as helium or ethane, the collisions widened Only 0.02 ~ 0.04nm, and commercially available high power semiconductor laser output spectrum width of 2 ~ 4nm, it is difficult to achieve effective pumping. The Littman external cavity structure is used to narrow the output spectral width of a 20W single wide-face-source high-power semiconductor laser to obtain a narrow linewidth output of 7.87W and a spectral width of less than 0.1nm. The narrow linewidth output laser is absorbed by 80kPa ethane, 110 ℃ rubidium cell and 90% pump light, and the output spectral width of the semiconductor laser is estimated to be 30GHz by comparison with the theoretical model.