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Tunable external-cavity semiconductor laser using monolithically integrated tapered amplifier and grating coupler for collimation

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7 Author(s)
Uemukai, M. ; Dept. of Electron. Eng., Osaka Univ., Japan ; Suhara, T. ; Yutani, K. ; Shimada, N.
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A novel lensless tunable external-cavity laser using monolithically integrated tapered amplifier, grating coupler (GC) and an external half mirror is proposed and demonstrated. It can be fabricated by a simple process and emits a collimated output beam. By making use of wavelength dispersion of the GC, the lasing wavelength can be angle tuned. Wavelength tuning over a wide range of 21.5 nm by 4.5/spl deg/ device rotation and an 84-mW output power were achieved under continuous-wave operation. A well-collimated output beam with a divergence angle as small as 0.3/spl deg/ was maintained over the entire tuning range.

Published in:

Photonics Technology Letters, IEEE  (Volume:12 ,  Issue: 12 )