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Dispersion-compensated wavelength beam combining of quantum-cascade-laser arrays |
Optics Express, Vol. 19, Issue 27, pp. 26725-26732 (2011)
http://dx.doi.org/10.1364/OE.19.026725
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Abstract
A multiwavelength array of distributed feedback (DFB) quantum cascade lasers (QCLs) that spans λ = 8.28 to 9.62 μm is wavelength beam combined (WBC) using both single-grating and dual-grating designs. WBC with a single grating results in a pointing error of 3-times the beam divergence for a single laser and arises from the nonlinear dispersion of the grating. By adding a second grating to compensate for the nonlinear dispersion, the pointing error is reduced to only 13% of the beam divergence for a single laser. A transceiver based on the dual-grating-WBC QCL was used to measure the transmittance of a polymer sheet placed between itself and a retroreflector over a round-trip distance of 70 meters.
© 2011 OSA
OCIS Codes
(140.3290) Lasers and laser optics : Laser arrays
(140.3490) Lasers and laser optics : Lasers, distributed-feedback
(140.3298) Lasers and laser optics : Laser beam combining
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade
ToC Category:
Lasers and Laser Optics
History
Original Manuscript: September 12, 2011
Revised Manuscript: November 5, 2011
Manuscript Accepted: November 7, 2011
Published: December 14, 2011
Citation
Anish K. Goyal, Melissa Spencer, Oleg Shatrovoy, Benjamin G. Lee, Laurent Diehl, Christian Pfluegl, Antonio Sanchez, and Federico Capasso, "Dispersion-compensated wavelength beam combining of quantum-cascade-laser arrays," Opt. Express 19, 26725-26732 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-27-26725
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