Abstract
The difference frequency generation in the AgGaSe2 crystal between output waves of a periodically poled MgO doped lithium niobate (PP-MgO : LN) optical parametric oscillator (OPO) is described in this paper. The wavelength of the generated radiation is tunable from 6 to 13 µm with the average generated power in the range of several microwatts. The set-up allows a rapid tuning of the wavelength in the limited region of spectra without changing the temperature of the PP-MgO : LN crystal. A typical spectral linewidth of 5 cm-1 makes this source suitable for spectrometry of complex molecules under atmospheric conditions. The measured spectrum of the acetone vapour is presented to confirm this fact. Keywords: nonlinear optics, optical frequency converters, infrared sources
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