摘要
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 high efficiency diode pumped alkali metal vapor laser, a gain cell with Brewster angle structure is used. The one-trip transmittance of the laser is improved effectively and the one-trip transmittance of the laser in p-polarization is 97%. A gain cell with length of 1 nm is used. It is filled with alkali metal rubidium vapor as gain medium and methane with pressure of 79.99 kPa as buffer gas. A diode laser is used as the pump source when the power is 48 W, the central wavelength is 780 nm and the line width is 0.1 nm. In order to reduce the thermal effect of gain cell, a chopper is used to change the continuous pump laser to pulse output with pulse width of 1.85 ms , repetition frequency of 15 Hz and duty ratio of 2.77%. The experiment is optimized by using 12 cm flat concave resonator and the output mirrors with output coupling rate of 41%, 58%, 76%. When the temperature of the cell is 160 ℃, using the output mirror of 76%, the rubidium laser with wavelength of 795 nm and highest peak power of 16.8 W is obtained. The optical to optical efficiency is about 35%, and the slope efficiency is 44.2%.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2016年第3期20-23,共4页
Chinese Journal of Lasers
基金
国家自然科学基金(61405197)
中国科学院化学激光重点实验室开放课题(KLCL2015-HT-N04)
