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

Abstract

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.

Cited by in corpus (5)

• Sensitive multiplex spectroscopy in the molecular fingerprint 2.4 $\mu$m region with a Cr^{2+}:ZnSe femtosecond laser
• Femtosecond laser Fourier transform absorption spectroscopy
• Soliton absorption spectroscopy
• N_2O weak lines observed between 3900 and 4050 cm^-1 from long path absorption spectra
• Acetylene weak bands at 2.5 $\mu$m from intracavity Cr2+:ZnSe laser absorption observed with time-resolved Fourier transform spectroscopy