Half-ring (GaAl)As double-heterojunction injection lasers

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Abstract
We report room temperature operation of injection‐pumped (GaAl)As half‐ring lasers with high mesa stripe geometry. The performance of these lasers is compared with that of the corresponding straight laser. The outstanding features of the half‐ring laser are: (1) Large variation of the far‐field patterns both in shape and in main‐lobe position with the length of the straight section, (2) improved L‐I characteristics, and (3) cleaner longitudinal mode spectra. These observations suggest that the lateral modes in a composite cavity oscillate as a whole to form a hybrid mode. Such hybridization should lead to greater mode stability.

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