Jiyuan LIU and Ichirou YAMAGUCHI

Optical Engineering Laboratory, The Institute of Physical and Chemical Research (RIKEN), 2-1, Hirosawa, Wako, Saitama, 351-0198, Japan

(Received May 1, 1999; Accepted July 5, 1999)

We have found that the fringes in a laser diode interferometer can be locked even in the presence of mirror vibration and injection current modulation. A theoretical analysis explains the fringe locking phenomenon. The dependence of wavelength change on both PZT (piezoelectric transducer) mirror vibration and the injection current variation are calculated using a model of coupled resonators consisting of the laser cavity and the interferometer. The fringe phase change caused by the vibration and modulation of the current is derived from this model, and was proven to be suppressed within much less than 2π in excess of an integer multiple of 2π.

Key words : laser diode, interferometry, injection current modulation, fringe locking

liu@optsun.riken.go.jp