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InGaAs angled-grating distributed Bragg reflector lasers integrated with grating outcoupler for collimation

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4 Author(s)
Uemukai, M. ; Dept. of Electron. Eng., Osaka Univ., Japan ; Kunoh, Y. ; Shimada, N. ; Suhara, T.

An angled-grating distributed Bragg reflector (DBR) laser integrated with a grating outcoupler (GO) is proposed and demonstrated. It consists of an angled broad-area gain stripe surrounded by angled DBR (α-DBR) gratings parallel to the gain stripe and two DBR gratings for feedback at the stripe ends, and a GO for emitting a collimated output beam. Due to distributed Bragg reflection in the α-DBR gratings, filamentation can be suppressed. Single-mode lasing up to 69 mW peak power was obtained under pulse condition. A collimated output beam with divergence angles, close to the diffraction limit, was obtained. These results confirm the effectiveness of the α-DBR gratings.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:9 ,  Issue: 5 )