title: Frequency stabilization of a semiconductor laser by external phase-conjugate feedback.
abstract: We report the stabilization of a laser diode by external phase-conjugate feedback from a broad-area laser diode. The linewidth of the stabilized laser diode was reduced from 5 MHz to 25 kHz, approaching the limit set by the fluctuations of the pump beam for the phase conjugator. Clear evidence of phase conjugation was the observation of paired half-axial side modes spaced at frequencies of c/4L with respect to the main mode.
authors.forename: P
authors.initials: P
authors.lastname: Kürz
authors.forename: T
authors.initials: T
authors.lastname: Mukai