Abstract
We describe a widely tunable, power-controlled oscillation method of AlGaAs semiconductor lasers in the visible region, based on temperature modulation by a microheater placed on the laser chip. The continuous frequency tuning range for a single-axial-mode operation is extended to 0.28 nm (132 GHz) at 779 nm by the heater current modulation. Cutoff frequency of the temperature modulation response is 50 Hz. The injection current is used mainly for the power control of the FM oscillation. By using a short external mirror for axial mode selection, the continuous tuning range is further increased to 0.49 nm (237 GHz), which corresponds to almost five times the value with the injection current modulation.
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