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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
InAsSb/InAsSbP double heterostructure lasers for 3-4 micrometer spectral range
A P Astakhova1, A N Imenkov, T N Danilova
1Ioffe Physico-Technical Institute, RAS, 26, Politechnicheskaya st., 194021 St. Petersburg, Russia. dap@iropt4.ioffe.ru
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|February 24, 2007
Summary
Diode lasers emitting infrared light were tuned using electrical current, achieving precise wavelength control for gas detection. This study details their performance and proposes a model for this tuning phenomenon.
Area of Science:
- Semiconductor physics
- Optoelectronics
- Infrared spectroscopy
Background:
- InAsSb/InAsSbP double heterostructure diode lasers are crucial for mid-infrared applications.
- Understanding laser tuning mechanisms is vital for developing advanced spectroscopic tools.
Purpose of the Study:
- Investigate wavelength tuning in InAsSb/InAsSbP diode lasers.
- Analyze tuning as a function of stripe width, temperature, and current.
- Propose a theoretical model for current-induced wavelength tuning.
Main Methods:
- Liquid phase epitaxy for laser fabrication.
- Measurement of temperature and current tuning characteristics.
- Analysis of emission spectra, far-field patterns, and wavelength tuning versus current.
Main Results:
- Achieved single-mode lasing with current-tunable wavelengths at 77K.
- Demonstrated tuning towards shorter wavelengths (up to 4.56 cm-1) and longer wavelengths (up to 0.9 cm-1).
- Confirmed the quantum-mechanical nature of current tuning and proposed a theoretical model.
Conclusions:
- Optimized conditions for diode laser use in detecting NH3, CH3Cl, OCS, and atmospheric water.
- Established the rapid photon lifetime-limited tuning times (10^-9 to 10^-12 s).
- Reported a narrow emission line-width of 20 MHz for high-resolution applications.
