Frequency-locking and threshold current-lowering effects of a quantum cascade laser and an application in gas detection field |
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). |