Intracavity laser absorption spectroscopy (ICLAS) with an evacuated laser is performed with a high-resolution time-resolved Fourier transform interferometer with a minimum detectable absorption coefficient equal to in the region. This represents the extreme limit currently 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 , wide enough to see entire vibration bands. Weak bands observed up to now only in the Venusian atmosphere are recorded for the first time, to our knowledge, in a laboratory. An detection limit down to 0.9 parts per billion by volume is also demonstrated.
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