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.
© 1998 1998 Optical Society of America
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(320.7080) Ultrafast optics : Ultrafast devices
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
F. Rotermund and V. Petrov, "Generation of the fourth harmonic of a femtosecond Ti:sapphire laser," Opt. Lett. 23, 1040-1042 (1998)