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Conferences > ASSL > 2000 > ME > ME4

Mid-BR photoacoustic trace gas spectroscopy with an optical parametric oscillator based difference frequency generation laser source

A. Bohren, T. von Lerber, and M. W. Sigrist

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Abstract

A nanosecond pulsed Optical Parametric Oscillator based Difference Frequency Generation IR-Laser source is implemented in a spectrometer for sensitive and selective trace gas analysis. Tuning ranges of 400 - 2000 nm for the OPO and of 2.5 to 4.5 µm using LiNbO3 as non-linear medium for the DFG source are achieved at a line width of 0.25 cm−1. Photoacoustic measurements in a novel multi-microphone gas cell enable the monitoring of gases at ppb concentration levels.

© 2000 Optical Society of America

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