EXPERIMENTAL-STUDY OF BEAM-STEERING IN 980-NM INGAP CLADDING LASERS

The beam steering phenomenon was directly observed by means of backpla ne electroluminescence in 980 nm InGaP cladding power lasers. The elec troluminescence of the lasers which showed lateral beam steering had a periodic pattern along the active region, which was assumed to be due to spatial hole burning. The period of this pattern was roughly estim ated using the effective refractive index method. A laser satisfying t he cut-off condition for higher lateral modes did not exhibit a period ic pattern of electroluminescence.