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Article Abstract
Difference frequency generation setup for frequency conversion of a femtosecond Ti:sapphire laser pulse into the long-wavelength mid-infrared (IR) range with a single HgGaS nonlinear crystal was launched and demonstrated to be the best, to our knowledge, combination of simplicity and efficiency. In this setup, the signal wave was formed by spectrum broadening of the aforementioned laser pulse under its filamentation in a CO gas cell. The spectrum tuning of a mid-IR laser pulse within a wavelength interval of 6-10.5 μm was demonstrated. The maximum energy of 0.24 ps laser pulse at 8 μm wavelength reached up to 35 μJ at an internal quantum conversion efficiency of 30%.
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