Generation of the fourth harmonic of a femtosecond Ti:sapphire laser.
A high-repetition-rate femtosecond laser system operating, for the first time to our knowledge, in the spectral region near 200 nm is described. Frequency quadrupling of a mode-locked Ti:sapphire laser results in maximum average powers of 6 mW (165-fs pulses) and 15 mW (340-fs pulses) at 82 MHz. The shortest wavelength achieved is 193.7 nm.
Rotermund
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Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, Rudower Chaussee 6, D-12489 Berlin, Germany.
Petrov
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