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Proceedings Paper

Optically pumped type-II mid-IR tunable DFB laser
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Paper Abstract

A new approach to tunable mid-infrared lasers, an optically pumped, type-II, InGaSb/InAs gain medium with a chirped distributed feedback grating, has been developed. The chirped grating is patterned using an interferometric lithography (IL) technique with spherical wave fronts and etched into the top cladding of the laser slab waveguide structure. Because the period of grating increases gradually laterally, wavelength tuning is implemented by shifting pump stripe to different positions on the device with different grating periods. Fabry-Perot modes from the cleaved facets are successfully suppressed by fabricating the grating 6° tilted with respect to facets and adjusting the pump stripe normal to the grating. Continuous tuning of 30 nm around 3.1 μm with 320 mW single facet output power at 80K and a 1.6 nm FWHM is reported. The present device is designed in the 3- to 4-μm range which matches a low loss atmospheric transmission window, and covers an important region of molecular vibration spectra, in particular, the hydrocarbon C-H stretch at ~ 3.3 μm, making it suitable for atmospheric pressure remote gas sensing of industrially important small molecules such as methane, hydrogen chloride and ammonia.

Paper Details

Date Published: 8 February 2012
PDF: 7 pages
Proc. SPIE 8277, Novel In-Plane Semiconductor Lasers XI, 82771C (8 February 2012); doi: 10.1117/12.909033
Show Author Affiliations
Xiang He, The Univ. of New Mexico (United States)
R. Kaspi, Air Force Research Lab. (United States)
S. R. J. Brueck, The Univ. of New Mexico (United States)

Published in SPIE Proceedings Vol. 8277:
Novel In-Plane Semiconductor Lasers XI
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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