Semiconductor raman laser

Abstract
The semiconductor Raman laser using the longitudinal optical phonon mode of GaP has a very low threshold value of optical input power. To reduce the threshold optical input power and power density further, a crystal as thin as 160 µm with a wave-guiding structure is used. Epitaxial layers of GaP with a thickness of 280 µm are demonstrated as the low-threshold semiconductor Raman laser, for which the threshold input power density is as low as 1.7 × 106 W/cm2.

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