A new composite-cavity laser with two different waveguide cores for stable longitudinal mode operation

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Abstract
We have developed a new composite-cavity laser with two different waveguide cores connected near the front mirror in the same cladding. This composite cavity has a built-in structure that is capable of giving high mode selectivity because of strongly modulated reflectivity of the front mirror. The laser shows very stable single longitudinal mode operation in a temperature range as wide as about 50 °C for output powers from 3 to 100 mW without mode hopping.