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Proceedings Paper

All-optical laser spectral narrowing and line fixing at atomic absorption transition by injection competition and gain knock-down techniques
Author(s): Lazarina I. Gacheva; Margarita A. Deneva; Mihail H. Kalbanov; Marin N. Nenchev
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Paper Abstract

We present two original, all optical techniques, to produce a narrowline laser light, fixed at the frequency of a chosen reference atomic absorption transition. The first type of systems is an essential improvement of our method 3,4 for laser spectral locking using a control by two frequency scanned, competitive injections with disturbed power ratio by the absorption at the reference line. The new development eliminates the narrowing limiting problem, related with the fixed laser longitudinal mode structure. We have proposed an original new technique for continuously tunable single mode laser operation in combination with synchronously and equal continuous tuning of the modes of the amplifier. By adapting the laser differential rate equations, the system is analyzed theoretically in details and is shown its feasibility. The results are in agreement with previous our experiments. The essential advantage, except simplicity of realization, is that the laser line can be of order of magnitude and more narrowed than the absorption linewidth. The second system is based of the laser amplifier arrangement with a gain knock-down from the competitive frequency scanned pulse, except at the wavelength of the desired absorption reference line. The essential advantages of the last system are that the problem of fixing laser mode presence is naturally avoided. The theoretical modeling and the numerical investigations show the peculiarity and advantages of the system proposed. The developed approaches are of interest for applications in spectroscopy, in DIAL monitoring of the atmospheric pollutants, in isotope separation system and potentially - for creation of simple, all optical, frequency standards for optical communications. Also, the continuously tunable single mode laser (and the combination with the simultaneously tunable amplifier) presents itself the interest for many practical applications in spectroscopy, metrology, and holography. We compare the action and the advantages of the two systems proposed.

Paper Details

Date Published: 19 December 2008
PDF: 11 pages
Proc. SPIE 7027, 15th International School on Quantum Electronics: Laser Physics and Applications, 70270H (19 December 2008); doi: 10.1117/12.822455
Show Author Affiliations
Lazarina I. Gacheva, Technical Univ. of Sofia (Bulgaria)
Margarita A. Deneva, Technical Univ. of Sofia (Bulgaria)
Mihail H. Kalbanov, Technical Univ. of Sofia (Bulgaria)
Marin N. Nenchev, Technical Univ. of Sofia (Bulgaria)
Institute of Electronics (Bulgaria)

Published in SPIE Proceedings Vol. 7027:
15th International School on Quantum Electronics: Laser Physics and Applications
Tanja Dreischuh; Elena Taskova; Ekaterina Borisova; Alexander Serafetinides, Editor(s)

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