半导体泵浦铷蒸气激光实现线偏振基模输出

摘要

采用2400 1/mm的平面光栅搭建Littrow外腔压窄半导体激光器输出激光线宽,获得中心波长可调的线宽0.16 nm的半导体激光作为铷蒸气激光的泵浦源.实验中,使用斩波器将泵浦光变为脉宽1 ms,重复频率100 Hz的重复脉冲形式,聚焦进长度为8 mm的铷蒸气泡,泡内充入79 kPa甲烷作为缓冲气体.进入铷蒸气泡的泵浦光峰值功率为1.84 W时,控制铷泡温度在125℃,获得了峰值功率17.5 mW的基模线偏振铷激光输出.%A Littrow external cavity was built to narrow the spectral linewidth of a diode laser to 0. 16 nm by using a 2400 line/mm plane grating, with the center wavelength of the laser tunable. The laser was used as the pump source of the rubidium vapor laser. A chopper was employed to change the continuous laser to pulsed laser with the pulse width of 1 ms and the repetition rate of 100 Hz, then the laser was focused to a Rb vapor cell with the length of 8 mm which was filled with Methane at the pressure of 79 kPa. With the maximum peak power of the pulsed laser injected into the Rb cell is 1. 84 W and the temperature of the cell is controlled at about 125℃, the linearly polarized fundamental mode Rb laser with the peak power of 17. 5 mW is obtained.