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Proceedings Paper

Efficient 1.6 micron laser source for methane DIAL
Author(s): Timothy Shuman; Ralph Burnham; Amin R. Nehrir; Syed Ismail; Johnathan W. Hair; Tamer Refaat
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Paper Abstract

Methane is a potent greenhouse gas and on a per molecule basis has a warming influence 72 times that of carbon dioxide over a 20 year horizon. Therefore, it is important to look at near term radiative effects due to methane to develop mitigation strategies to counteract global warming trends via ground and airborne based measurements systems. These systems require the development of a time-resolved DIAL capability using a narrow-line laser source allowing observation of atmospheric methane on local, regional and global scales. In this work, a demonstrated and efficient nonlinear conversion scheme meeting the performance requirements of a deployable methane DIAL system is presented. By combining a single frequency 1064 nm pump source and a seeded KTP OPO more than 5 mJ of 1.6 μm pulse energy is generated with conversion efficiencies in excess of 20%. Even without active cavity control instrument limited linewidths (50 pm) were achieved with an estimated spectral purity of ~95%. Tunable operation over 400 pm (limited by the tuning range of the seed laser) was also demonstrated. This source demonstrated the critical needs for a methane DIAL system motivating additional development of the technology.

Paper Details

Date Published: 17 September 2013
PDF: 11 pages
Proc. SPIE 8872, Lidar Remote Sensing for Environmental Monitoring XIV, 88720A (17 September 2013);
Show Author Affiliations
Timothy Shuman, Fibertek, Inc. (United States)
Ralph Burnham, Fibertek, Inc. (United States)
Amin R. Nehrir, NASA Langley Research Ctr. (United States)
Syed Ismail, NASA Langley Research Ctr. (United States)
Johnathan W. Hair, NASA Langley Research Ctr. (United States)
Tamer Refaat, Old Dominion Univ. (United States)

Published in SPIE Proceedings Vol. 8872:
Lidar Remote Sensing for Environmental Monitoring XIV
Upendra N. Singh, Editor(s)

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