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为了获得高效半导体抽运碱金属蒸气激光器,采用布儒斯特角结构的增益池,有效地提高了激光的单程透射率,p偏振的激光单程透射率达到97%。采用长度为1 cm的增益池,其内填充碱金属铷蒸气作为增益介质和压强为79.99 k Pa的甲烷作为缓冲气体。采用中心波长为780 nm,线宽为0.1 nm,功率为48 W连续输出的半导体激光器作为抽运源。为了降低增益池内的热效应,采用斩波器将抽运光转化成脉冲形式输出,脉冲宽度为1.85 ms,重复频率为15 Hz,占空比2.77%。采用12 cm的平凹谐振腔,利用输出耦合率分别为41%、58%、76%的输出镜进行了优化实验。在增益池温度为160℃时,采用输出耦合率为76%的输出镜,获得了峰值功率最高为16.8 W的中心波长为795 nm的铷激光输出,光-光转换效率为35%,斜率效率为44.2%。
In order to obtain efficient pumping of alkali metal vapor laser diode, using Brewster angle structure of the gain pool, effectively improve the laser one-way transmittance, p-polarized laser one-pass transmittance of 97%. A 1-cm-long gain cell filled with alkali metal rubidium vapor as the gain medium and methane at a pressure of 79.99 kPa was used as a buffer gas. A diode laser with a center wavelength of 780 nm, a line width of 0.1 nm and a power output of 48 W is used as the pump source. In order to reduce the thermal effect in the gain cell, a chopper is used to convert the pump light into a pulsed output with a pulse width of 1.85 ms, a repetition frequency of 15 Hz and a duty cycle of 2.77%. Using a 12-cm flat-concave resonator, an output experiment of 41%, 58%, and 76% output couplings was performed. At a gain cell temperature of 160 ° C, an output mirror with an output coupling ratio of 76% was used to obtain a rubidium laser output with a peak power of 16.8 W and a center wavelength of 795 nm with an optical-to-optical conversion efficiency of 35% and a slope efficiency 44.2%.