Abstract
Thermally induced changes in the length of the external resonator in a three-mirror coupled cavity laser can enhance the temperature range for single longitudinal mode operation. The enhancement occurs when the length of the external resonator is altered to track the change in the effective length of the laser diode, hence maintaining feedback on the same longitudinal mode. We observe stable single longitudinal mode operation for 15 °C with a planar external mirror and for as much as 25 °C with a confocal spherical mirror in a coupled cavity device incorporating an AlGaAs laser diode at constant current. This is a three to fivefold enhancement over what would be expected if the passive cavity were of fixed length. The data are consistent with thermal compensation of the external cavity length to match the thermal effects on the refractive index of the AlGaAs diode.
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