Time-resolved Fourier transform intracavity spectroscopy with a Cr2+:ZnSe laser

Details Time-resolved Fourier transform intracavity spectroscopy with a Cr2+:ZnSe laser Time-resolved Fourier transform intracavity spectroscopy with a Cr2+:ZnSe laser

2006-11-27

arxiv.org/abs/physics/0611255v1

Optics Letters 34 (15/12/2005) 3410-3412

Physics

Optics

Scientific paper

10.1364/OL.30.003410

Intracavity laser absorption spectroscopy (ICLAS) with an evacuated Cr2+: ZnSe laser is performed with a high-resolution time-resolved Fourier transform interferometer with a minimum detectable absorption coefficient equal to 4 10-9 cm-1 Hz-1/2 in the 2.5$\mu$m region. This represents the extreme limit presently reached in the infrared by ICLAS with Doppler limited resolution. The broad gain band of the crystal allows a spectral coverage at most equal to 125 nm, wide enough to see entire vibration bands. Weak CO2 bands observed up to now only in the Venus atmosphere are recorded for the first time in a laboratory. H2O detection limit down to 0.9 ppbv is also demonstrated.

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