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Abstract.An output of 6W at 30kHz was achieved using Tl3AsSe3 as the nonlinear second-harmonic generator. It was pumped with a CO2 laser source at a wavelength of 9.25m with 20ns pulses, and the laser beam was focussed to a spot size of 150m. The focussed spot was scanned to reduce the continuous-wave power loading, and the system could be operated for extended periods of time under these conditions.
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