Semiconductor Laser with a Self-Pumped Phase Conjugate External Cavity, (Final Report for October 1, 1990-July 31, 1992).

摘要

This dissertation is intended to study the effects of self-pumped phase-conjugate feedback on a semiconductor laser. The concept of the unidirectional ring passive phase-conjugate mirror (PPCM) external cavity semiconductor laser (URECL) is introduced. This device consists of a laser diode coupled to a self-pumped ring phase-conjugate mirror. The URECL is compared and contrasted with a conventional external cavity semiconductor laser (CECL) that models a simple dielectric reflector for the feedback device, and with a phase-conjugate external cavity laser (PCECL) that models theoretically ideal phase conjugation as the feedback mechanism. The effective reflectivities for the different types of reflectors are derived and compared. The rate equations for all three cases are derived and plotted for comparison. The boundary conditions for the phase-conjugate cases are derived and experimental evidence is used to support the claim that a 2npi (n being a variable integer) phase shift occurs for the PCECL and URECL. The multimode behavior of the free running laser, the CECL, and the URECL are compared. Experimental evidence of coherence collapse is presented and discussed. The dynamic rate equations are given and contrasted. The beam quality of the unidirectional ring PPCM is considered.