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An influence of multi-line CO laser focusing on spectral characteristics ofbroadband sum-frequency generation in ZnGeP2 nonlinear crystal wasexperimentally and numerically studied. Maximal frequency conversion wasexperimentally observed under tight focusing of the multi-line rather thansingle-line CO laser. The tight focusing resulted in broadening sum-frequencygeneration spectrum and increasing total, i.e. integrated over the spectrum,frequency conversion efficiency. These effects were due to increasingphase-matching bandwidth and angular dispersion. Maximal conversion efficiencyof the multi-line CO laser was numerically demonstrated to take place at thefocal length of 0.4 times that for the single-line one.

Influence of multi-line CO laser focusing on broadband sum-frequency generation in ZnGeP2