Fiber Laser Intra-Cavity Spectroscopy (FLICS)

Juan HERNANDEZ-CORDERO  Theodore F. MORSE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E83-C   No.3   pp.371-377
Publication Date: 2000/03/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Fiber Sensors)
Category: Chemical, Environmental, Biochemical and Medical Sensors
Keyword: 
fiber optics sensors,  fiber lasers,  fiber optics amplifiers,  oscillators,  

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Summary: 
Compact intra-cavity spectroscopic measurements may be obtained with any material that has an absorption signature under the gain bandwidth of a fiber laser. Experiments have demonstrated that compared with a regular absorption scheme, an increase in sensitivity is achieved when using the intra-cavity configuration. The practical limit for this enhancement is given by the fiber laser noise. Since intra-cavity spectroscopy is essentially a single beam technique, the application of dual-beam noise reduction techniques is not possible. However, considering that a single-mode fiber can support two modes of polarization, we have used a polarization beam splitter to create two independent cavities (x and y polarization) with the same noise, one cavity of which contains the absorber. For the first time, this permits the convenient use of Balanced Ratiometric Detection in conjunction with an intra-cavity absorption arrangement.