A broadly tunable high-resolution IR cavity ring-down spectrometer based on difference frequency generation in orientation-patterned GaAs

Scott E. Bisson; Thomas J. Kulp; Ofer Levi; J. Harris; Martin M. Fejer

doi:10.1117/12.531730

14 June 2004 A broadly tunable high-resolution IR cavity ring-down spectrometer based on difference frequency generation in orientation-patterned GaAs

Scott E. Bisson, Thomas J. Kulp, Ofer Levi, J. Harris, Martin M. Fejer

Author Affiliations +

Proceedings Volume 5337, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications III; (2004) https://doi.org/10.1117/12.531730
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States

Abstract

The advent of novel quasi-phase matched materials based on patterned growth gallium arsenide offer the possibility of broadly tunable IR sources covering the long- (5-12μm) and mid-wave (3-5μm) infrared spectral regions. From the standpoint of chemical sensing, the long-wave infrared region between 8-12μm is attractive since it is an atmospheric window, many functional groups absorb in this region and absorptions tend to be strong compared to the mid-IR. We are employing orientation patterned GaAs as part of cw difference frequency spectrometer. In this system, light from two, tunable external cavity diode lasers covering the 1.3μm and 1.5μm telecom bands was amplified then mixed in an orientation- patterned GaAs crystal, producing radiation in the 7-9μm region. The system serves as a source for a cw cavity ring-down spectrometer for ultra-trace gas detection applications. The combined tunability of the source, coupled with the sensitivity of cavity ringdown spectroscopy will allow both detection and identification of a wide range of species with unprecedented performance.

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Scott E. Bisson, Thomas J. Kulp, Ofer Levi, J. Harris, and Martin M. Fejer "A broadly tunable high-resolution IR cavity ring-down spectrometer based on difference frequency generation in orientation-patterned GaAs", Proc. SPIE 5337, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications III, (14 June 2004); https://doi.org/10.1117/12.531730

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KEYWORDS

Gallium arsenide

Spectroscopy

Crystals

Infrared spectroscopy

Semiconductor lasers

Long wavelength infrared

Biological and chemical sensing

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