Passive Mode Locking of Lasers with the Optical Kerr Effect Modulator

Abstract

A detailed analytical investigation is presented of a nonlinear device termed the optical Ken effect modulator (OKEM) which is used to passively Q switch and mode lock high power lasers. Experimentally, an OKEM employing two standard quarter-wave plates is used to passively mode lock the Nd glass laser. The mode-locking threshold dependence upon the parameters of the OKEM transmission function is definitively established. Pulsewidths and spectral measurements are given for the train of ultrashort pulses from the glass laser mode locked with the OKEM using two different Kerr liquids. The analytical and experimental results together indicate that the OKEM technique is a versatile and viable alternative and in addition overcomes most of the Show more