The first singlemode room temperature AlGaInP monolithically frequency-stabilised lasers are reported. Single frequency and single spatial mode operation is obtained using a second order diffraction grating to stabilise the operating wavelength. The device produced > 20 mW CW with a differential efficiency of 0.18 W/A and a sidemode suppression ratio of > 30 dB.
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Pezeshki et al. (1996) studied this question.
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