WAVELENGTH-STABLE, NARROW-SPECTRAL-WIDTH OSCILLATION OF AN ALGAINP DIODE-LASER COUPLED TO A BATIO3-CO STIMULATED PHOTOREFRACTIVE BACKSCATTERING PHASE CONJUGATOR

We have demonstrated the operation of a 639-nm cw index-guided AlGaInP diode laser coupled to a barium titanate (BaTiO3) stimulated photoref ractive backscattering (SPBS) phase conjugator. The SPBS process was s uccessfully achieved by the combination of the short-wavelength diode laser and the highly doped photorefractive BaTiO3:Co crystal. The spec tral width of the diode laser is reduced to 7.2 pm because of the narr ow spectral bandwidth of the gratings [with wave number of K = 2k(2k g ratings)] formed in the SPBS phase conjugator, compared with the trans mission grating formed in the conventional cat conjugator, which was u sed previously. The SPBS phase conjugator was successfully used to sup press self-frequency scanning, and wavelength-stable oscillation of th e SPBS phase-conjugator-coupled diode laser was achieved.