Generation of femtosecond radiation at 211 nm by femtosecond pulse upconversion in the field of a picosecond pulse.
We show that, in the case of sum-frequency mixing, one can alleviate group-velocity mismatch between IR and UV pulses by choosing different pulse widths, thus extending the interaction length of ultrashort pulses within nonlinear crystals. By fifth-harmonic generation with a Nd:glass laser, we demonstrate efficient frequency upconversion of 195-fs 264-nm pulses under the envelope of 0.9-ps 1055-nm pulses in beta-barium borate crystal, yielding <270-fs pulses with energy of up to 110muJ at 211 nm.
Dubietis
A
A
Tamosauskas
G
G
Varanavi Ius
A
A
Valiulis
G
G
Danielius
R
R