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.
© 1996 Optical Society of America
Original Manuscript: April 1, 1996
Published: September 1, 1996
Peter Kürz and Takaaki Mukai, "Frequency stabilization of a semiconductor laser by external phase-conjugate feedback," Opt. Lett. 21, 1369-1371 (1996)