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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 13 — Jul. 1, 2013
  • pp: 15998–16006

The output power and beam divergence behaviors of tapered terahertz quantum cascade lasers

YanFang Li, Jian Wang, Ning Yang, Junqi Liu, Tao Wang, Fengqi Liu, Zhanguo Wang, Weidong Chu, and Suqing Duan  »View Author Affiliations

Optics Express, Vol. 21, Issue 13, pp. 15998-16006 (2013)

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We report on Terahertz quantum cascade lasers with tapered waveguide structure operating at ∼ 103 μm. The tapered waveguide effect on the output power and the laser beam divergence are experimentally studied with the tapered angle ranging from 0° to 8°. It is found that the peak output power of the devices with same length reaches the maximum at about 5° ∼6° tapered angle. Meanwhile, the horizontal divergence angle of the laser beam can be greatly reduced. The existence of such optimal tapered angle is explained by the finite-element simulation with the consideration of the self-focusing effect for the devices with larger tapered angle.

© 2013 OSA

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(230.0230) Optical devices : Optical devices
(260.5950) Physical optics : Self-focusing
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

Original Manuscript: April 22, 2013
Revised Manuscript: June 6, 2013
Manuscript Accepted: June 13, 2013
Published: June 27, 2013

YanFang Li, Jian Wang, Ning Yang, Junqi Liu, Tao Wang, Fengqi Liu, Zhanguo Wang, Weidong Chu, and Suqing Duan, "The output power and beam divergence behaviors of tapered terahertz quantum cascade lasers," Opt. Express 21, 15998-16006 (2013)

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