Abstract
We demonstrate an efficient CH3F oscillator based on an anti-reflection coated Ge dichroic beam splitter. When pumped by the 10R32 line of a CO2 laser (10.17 μm), 0.81-mJ far-infrared laser is obtained with the wavelength of 192 μm. The energy conversion efficiency of 0.16 % is the highest for an optically pumped 192-μm laser system to our knowledge. The beam quality factor of \(M_{x}^{2}\) and \(M_{y}^{2}\) is 1.53 and 1.57, respectively. Further, this oscillator can be extended to optically pumped far-infrared lasers with various wavelengths.
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