Diode-laser-based ultraviolet absorption sensor for nitric oxide |
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| Authors: | S.F. Hanna R. Barron-Jimenez T.N. Anderson R.P. Lucht J.A. Caton T. Walther |
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| Affiliation: | (1) Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123, USA, US;(2) Department of Physics, Texas A&M University, College Station, TX 77843-4242, USA, US |
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| Abstract: | An all-solid-state continuous-wave laser system for ultraviolet absorption measurements of the nitric oxide (NO) molecule has been developed and demonstrated. The single-mode, tunable output of a 10-mW, 395-nm external-cavity diode laser (ECDL) is sum-frequency-mixed with the output of a 115-mW, frequency-doubled, diode-pumped Nd:YAG laser in a beta-barium-borate crystal to produce 40 nW of tunable radiation at 226.8 nm. The wavelength of the 395-nm ECDL is then scanned over NO absorption lines to produce fully resolved absorption spectra. Initial results from mixtures of NO in nitrogen in a room-temperature gas cell are discussed. The estimated NO detection limit of the system for a demonstrated absorption sensitivity of 2×10-3 is 0.2 ppm per meter of path length for 300 K gas. The estimated accuracy of the measurements is ±10%. Received: 25 February 2002 / Revised version: 31 May 2002 / Published online: 8 August 2002 |
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| Keywords: | PACS: 07.07.Df 42.72.Bj 42.65.Ky |
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