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Proceedings Paper

Tunable optical fiber pumped difference frequency laser sources: state of the art
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Paper Abstract

Laser based gas detection and monitoring techniques have now evolved to a mature level. Critical laser performance parameters include spatial beam quality, usable IR power, linear frequency tunability and stability. For continuous-wave, long-path absorption spectroscopy, the development of robust mid-infrared spectroscopic sources has led to numerous selective, sensitive and real-time gas monitoring applications. These new compact and tunable spectroscopic sources (<0.5 cubic feet) can be designed for efficient room-temperature operation in the 2.4 - 4.6 microns wavelength region using standard near-IR telecom lasers that are optically mixed in nonlinear optical materials such as periodically poled LiNbO3 (PPLN). Wavelength multiplexing and flexible dispersion control of PPLN crystals offer convenient narrow-linewidth (100 kHz - 2 MHz), single or multiple-frequency mid-IR operation at the milli-watt level. This permits the sensitive detection of many molecules such as HF, HCl, CH2O, CH4, CO2, CO and N2O at their strong fundamental rotational-vibrational transitions using direct, dual-beam, 2-f and other advanced spectroscopic detection schemes. At this wavelength region, these new laser sources provide an ideal alternative to cryogenically cooled lead-salt diode lasers. This paper will focus on the comparison of the two technologies with an emphasis on achieving ultra-high sensitivity in ground and airborne applications.

Paper Details

Date Published: 23 September 2002
PDF: 4 pages
Proc. SPIE 4817, Diode Lasers and Applications in Atmospheric Sensing, (23 September 2002); doi: 10.1117/12.452082
Show Author Affiliations
Dirk A. Richter, National Ctr. for Atmospheric Research (United States)
Alan Fried, National Ctr. for Atmospheric Research (United States)
Frank K. Tittel, Rice Univ. (United States)

Published in SPIE Proceedings Vol. 4817:
Diode Lasers and Applications in Atmospheric Sensing
Alan Fried, Editor(s)

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