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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 1 — Jan. 8, 2007
  • pp: 113–128

Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides

Sushil Kumar, Benjamin S. Williams, Qi Qin, AlanW. M. Lee, Qing Hu, and John L. Reno  »View Author Affiliations

Optics Express, Vol. 15, Issue 1, pp. 113-128 (2007)

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Single-mode surface-emitting distributed feedback terahertz quantum-cascade lasers operating around 2.9 THz are developed in metal-metal waveguides. A combination of techniques including precise control of phase of reflection at the facets, and use of metal on the sidewalls to eliminate higher-order lateral modes allow robust single-mode operation over a range of approximately 0.35 THz. Single-lobed far-field radiation pattern is obtained using a π phase-shift in center of the second-order Bragg grating. A grating device operating at 2.93 THz lased up to 149 K in pulsed mode and a temperature tuning of 19.7 GHz was observed from 5 K to 147 K. The same device lased up to 78 K in continuous-wave (cw) mode emitting more than 6 mW of cw power at 5 K. In general, maximum temperature of pulsed operation for grating devices was within a few Kelvin of that of multi-mode Fabry-Perot ridge lasers.

© 2007 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3490) Lasers and laser optics : Lasers, distributed-feedback
(140.5960) Lasers and laser optics : Semiconductor lasers
(250.7270) Optoelectronics : Vertical emitting lasers

ToC Category:
Lasers and Laser Optics

Original Manuscript: October 18, 2006
Revised Manuscript: December 5, 2006
Manuscript Accepted: December 19, 2006
Published: January 8, 2007

Sushil Kumar, Benjamin S. Williams, Qi Qin, Alan W. Lee, Qing Hu, and John L. Reno, "Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides," Opt. Express 15, 113-128 (2007)

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