Frequency-locking and threshold current-lowering effects of a quantum cascade laser and an application in gas detection field*
Chen Wei-Gen, Wan Fu†, Zou Jing-Xin, Gu Zhao-Liang, Zhou Qu
       
Block diagram of the FL-CEAS system. The beam enters from the left after collimation. M3 is mounted on a piezoelectric mirror drive for satisfying the OF phase. L 1 = L 2 = 48.8   cm (where L 1 and L 2 are the lengths of the two cavity arms).