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Tunable single-frequency diode laser at wavelength lambda = 1.645 microm for methane concentration measurements
A V Gladyshev1, M I Belovolov, S A Vasiliev
1Fiber Optics Research Center, General Physics Institute of the Russian Academy of Sciences, 38 Vavilov St., 119991 Moscow, Russia. alexglad@fo.gpi.ru
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|November 25, 2004
Summary
We developed a new, affordable tunable diode laser with fiber optics for gas analysis. This laser enables precise spectroscopy of single absorption lines in various gases within the optical fiber transparency window.
Area of Science:
- Optoelectronics
- Spectroscopy
- Laser Technology
Background:
- Gas analysis requires precise spectroscopic methods.
- Existing methods can be complex or expensive.
- Optical fiber integration offers remote sensing capabilities.
Purpose of the Study:
- To develop a novel single-frequency tunable diode laser with fiber-optic output.
- To provide a simple, cost-effective solution for gas spectroscopy.
- To demonstrate its application in methane absorption band analysis.
Main Methods:
- Development of a single-frequency tunable diode laser.
- Integration of fiber-optic output for remote sensing.
- Spectroscopic analysis of methane absorption lines.
Main Results:
- Demonstrated laser operation for R7 line of the 2 nu(3) methane absorption band (lambda = 1.645 microm).
- Achieved a mode-hop-free tuning range of 35 GHz (1.2 cm(-1)).
- The proposed solution is convenient, simple, and inexpensive.
Conclusions:
- The novel tunable diode laser is suitable for gas-analysis applications.
- Fiber-optic output enhances its utility for remote sensing.
- This technology offers a practical approach for spectroscopy within the 0.7-1.7 microm optical fiber transparency window.