Document Detail

"All-fiber" tunable laser in the 2 μm region, designed for CO<sub>2</sub> detection.
MedLine Citation:
PMID:  23052080     Owner:  NLM     Status:  In-Data-Review    
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<sub>2</sub> detection. This has been done through a careful design to match the laser output wavelengths to the CO<sub>2</sub> 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.
Atasi Pal; Ranjan Sen; Kort Bremer; Shuang Yao; Elfed Lewis; Tong Sun; Kenneth T V Grattan
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied optics     Volume:  51     ISSN:  1539-4522     ISO Abbreviation:  Appl Opt     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0247660     Medline TA:  Appl Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7011-5     Citation Subset:  IM    
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