Generation of femtosecond radiation in the UV by femtosecond pulse up-conversion in the field of picosecond pump

Summary form only given. The spectral bandwidth of ultrashort pulse frequency convertors that in time domain is directly related to the group-velocity mismatch (GVM) is of high importance for frequency upconversion of femtosecond pulses. Among a variety of recently developed methods extending the bandwidth of sum-frequency converters only several of them have been demonstrated providing femtosecond pulses in the ultraviolet. To date, group velocity matching in nonlinear crystals by employment of tilted pulses and mixing of controlled phase-modulated pulses are efficient quite but complex techniques for broadband frequency conversion. In this contribution we suggest simple and efficient methods alleviating short-pulse GVM problems in the ultraviolet spectral region using femtosecond pulse up-conversion in the field of picosecond pump.