Abstract

Transient sum-frequency (SF) generation in presence of the special conditions of the group velocity mismatch (GVM) and strong energy exchange can lead to efficient SF pulse compression1. Second harmonic generation in type II phase matching KDP crystal, as a partial case of the SF generation, recently has been used as an effective method of the pulse shortening2, 3. The potential of this technique can be rather extended by employment of frequency-tunable sources such as a traveling-wave optical parametric generators (TOPG)4, 5. This should yield a number of the new features of compressed pulses: tunability, new wavelength region, and other nonlinear crystals to be used.

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