2.5THz量子级联激光器的研制

Fabrication of 2.5 THz quantum cascade laser

基于束缚态到连续态跃迁有源区能带结构，实现了2．5 THz量子级联激光器的连续波工作。激光器的输出频率随电流可在2．45-2．47 THz之间可调，在连续波工作模式下的最高输出功率大于6．0mw，最高连续波工作温度为60 K，阈值电流密度为120 A／cm2，经Si透镜整形后的输出光斑为高斯分布。

Based on bound-to-continuum intersubband transition, the 2.5 THz quantum cascade laser with a continuous-wave （CW） output power of several mW is achieved. The lasing frequency of the device can be tuned by changing the applied cur-rent. The device shows a CW output power more than 6 mW, with a threshold current density of 120 A/cm2 , and a lasing worktemperature up to 60 K, and it is a quasi-Gaussian intensity distribution after beam reformatiorL by using Si lens.