Abstract

Forty-four NH₃ absorption spectral lines of the combination tones of the vibration–rotation transitions were observed at 1.4988–1.5520 μm with a 1.5-μm grating-external-cavity semiconductor laser. The linewidth and absorption rate of NH₃ absorption spectral lines were measured. Also, the changes of center frequency and linewidth of the NH₃ absorption spectral line with the variation of NH₃ pressure were measured for what is to our knowledge the first time.

© 1993 Optical Society of America

Stark-modulation spectroscopy of NH₃ with a 1.23-μm semiconductor laser

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