We have demonstrated a single-mode lasing with a narrow single-lobe beam emission from InP-based double-lattice photonic-crystal surface-emitting lasers (PCSELs) in a wide temperature range from 25°C to 80°C under CW condition. A high output power of 240 mW is achieved at a temperature of 25°C. The lasing occurs even at a high temperature of 80°C, and the output power is 48 mW. The single-mode lasing and the narrow single-lobe beam with divergence angle below 1.5°, which is a unique feature of PCSELs, are maintained even at a high temperature of 80°C.
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