A 3.5-mW continuous-wave difference-frequency source around 3 mu m for sub-Doppler molecular spectroscopy

Year: 2005

Authors: Maddaloni P., Gagliardi G., Malara P., De Natale P.

Autors Affiliation: Istituto Nazionale di Ottica Applicata (INOA), Comprensorio “A. Olivetti”, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy

Abstract: We report the development of a mid-infrared tunable coherent radiation source, based on difference-frequency generation (DFG). The signal and pump beams coming from two cw rare-earth-doped amplifiers are mixed into a periodically-poled LiNbO3 crystal to produce radiation in the 2.9 – 3.5 mum spectral range. For the first time to our knowledge, an output power of several mW has been achieved. We show that such a power can be exploited for high-resolution investigation of molecular absorption spectra. Saturation Lamb-dips have been observed for a number of ro-vibrational transitions belonging to the CH4 nu(3) fundamental band.


Volume: 80 (2)      Pages from: 141  to: 145

KeyWords: Absorption spectroscopy; Crystals; Doppler effect; Infrared radiation; Laser beams; Light amplifiers; Lithium niobate; Methane; Molecular spectroscopy; Molecular vibrations; Pumping (laser), Deifference-frequency generation (DFG); Mid-infrared tunable coherent radiation source; Quantum cascade lasers (QCL); Sub-Doppler molecular spectroscopy, Continuous wave lasers
DOI: 10.1007/s00340-004-1714-0

Citations: 58
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