Abstract
The generation of tunable narrow-band mid-infrared light by difference-frequency mixing of two kinds of continuous-wave ring-laser radiation in potassium titanyl phosphate is described. The system produces infrared powers of ∼20 µW of difference-frequency light continuously tunable from 1.05 to 2.8 µm (3500–9500 cm-1). Continuous scans over a range of 100 cm-1 with a spectral precision better than 10 MHz (0.0003 cm-1) are achieved. The high-resolution characteristics of the laser system are evaluated by use of a portion of Q2(0) overtone vibration–rotation spectrum of a solid parahydrogen crystal.
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