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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 29 — Oct. 10, 2012
  • pp: 7011–7015

“All-fiber” tunable laser in the 2 μm region, designed for CO 2 detection

Atasi Pal, Ranjan Sen, Kort Bremer, Shuang Yao, Elfed Lewis, Tong Sun, and Kenneth T. V. Grattan  »View Author Affiliations

Applied Optics, Vol. 51, Issue 29, pp. 7011-7015 (2012)

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A stable and tunable thulium-doped “all-fiber” laser offering a narrow linewidth has been created specifically to act as a compact and simple laser source for gaseous CO 2 detection. This has been done through a careful design to match the laser output wavelengths to the CO 2 absorption lines at 1.875 and 1.997 μm, respectively. A sustainable output power of 11 mW over a tuning range of 7 nm has been obtained by using a combination of a high-reflective fiber Bragg grating with a low-reflective broadband mirror, fabricated at the end of the fiber through silver film deposition. The tuning was achieved using the relaxation-compression mechanism of the fiber Bragg grating, which formed an integral part of the laser resonant cavity. A fiber Bragg grating at 1.548 μm was utilized as a wavelength reference to monitor the tuning of the laser output over the 2 μm wavelength range with a simple and inexpensive interrogator, to avoid the use of an expensive optical spectrum analyzer and to facilitate “in-the-field” operation. This “all-fiber” laser resonator has been shown to be superior in terms of laser tuning range, output power, and linewidth compared to that created with a fiber Bragg grating pair, which was limited by the nonuniform strain transfer to both fiber Bragg gratings.

© 2012 Optical Society of America

OCIS Codes
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(140.3600) Lasers and laser optics : Lasers, tunable
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Lasers and Laser Optics

Original Manuscript: June 4, 2012
Revised Manuscript: August 16, 2012
Manuscript Accepted: August 28, 2012
Published: October 5, 2012

Atasi Pal, Ranjan Sen, Kort Bremer, Shuang Yao, Elfed Lewis, Tong Sun, and Kenneth T. V. Grattan, "“All-fiber” tunable laser in the 2 μm region, designed for CO2 detection," Appl. Opt. 51, 7011-7015 (2012)

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