We demonstrated astigmatism in the output beam from the double-current-confinement channeled-substrate planar laser. A gradual transition from gain guiding toward index guiding is observed as the thickness of the cladding layer t is reduced. The near field is stable, and both the beam width and the beam-waist position are independent of the pumping levels over the range of current tested (up to 3 Ith).
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Chen et al. (1980) studied this question.
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