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Chinese Optics Letters

Chinese Optics Letters


  • Vol. 9, Iss. 6 — Jun. 10, 2011
  • pp: 061404–

Single-mode surface-emitting distributed feedback quantum-cascade lasers based on hybrid waveguide structure

Wanhong Guo, Junqi Liu, Jianyan Chen, Lu Li, Lijun Wang, Fengqi Liu, and Zhanguo Wang  »View Author Affiliations

Chinese Optics Letters, Vol. 9, Issue 6, pp. 061404- (2011)

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Surface-emitting distributed feedback quantum-cascade lasers operating at \lambda \approx 7.8 \mu m are demonstrated. The metal-covered second-order grating is shallow-etched into the surface of a thin InGaAs contact and cladding layer. This forms a hybrid waveguide and used to achieve relatively low waveguide losses and high coupling strengths. The devices exhibit stable single-mode operation from 90 to 130 K with a side mode suppression ratio above 20 dB. A slope efficiency of 194 mW/A is obtained at 90 K, which is twice higher than that of the Fabry-Perot counterpart.

© 2011 Chinese Optics Letters

OCIS Codes
(230.1950) Optical devices : Diffraction gratings
(250.7270) Optoelectronics : Vertical emitting lasers
(250.7360) Optoelectronics : Waveguide modulators
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

Wanhong Guo, Junqi Liu, Jianyan Chen, Lu Li, Lijun Wang, Fengqi Liu, and Zhanguo Wang, "Single-mode surface-emitting distributed feedback quantum-cascade lasers based on hybrid waveguide structure," Chin. Opt. Lett. 9, 061404- (2011)

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