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半导体抽运碱金属蒸气激光器(DPAL)具有量子效率高、气体介质循环流动散热、全电操作、结构紧凑等特点,是极具发展潜力的新型高能激光光源。其中,增益介质内碱金属原子浓度测量是对DPAL进行诊断测试的重要研究内容。通过利用单频分布布拉格反射(DBR)激光器波长扫描测量铷蒸气的吸收光谱,采用对激光器进行温度调节与电流扫描相结合的方法进行扫描光谱范围拼接,利用无跳模调谐范围为23GHz的激光器实现了100GHz的无跳模光谱扫描范围,在此基础上测量了充入大气压量级缓冲气体铷蒸气的完整吸收光谱。通过与理论计算结果进行参数拟合得到了铷原子浓度。该方法可应用于高功率抽运条件下流动介质DPAL中碱金属原子浓度的测量。
The semiconductor pumping alkali metal vapor laser (DPAL) is a new type of high-energy laser light source with great potential for development due to its high quantum efficiency, circulation and cooling of gaseous medium, full electric operation and compact structure. Among them, the concentration of alkali metal atoms in the gain medium is an important study on the diagnostic test of DPAL. The absorption spectrum of rubidium vapor was measured by wavelength scanning of single-frequency distributed Bragg reflection (DBR) laser, and the scanning spectral range was spliced by the combination of temperature regulation and current scanning. The laser was realized with a laser without mode hopping tuning range of 23 GHz Based on this, the complete absorption spectrum of rubidium vapor filled with atmospheric pressure buffer gas was measured. The concentration of rubidium atoms was obtained by fitting the parameters with theoretical calculation results. This method can be applied to the measurement of alkali metal atom concentration in the flow medium DPAL under high power pumping conditions.