Frequency detuning as a result of self-phase modulation that exceeds by four times the primary laser frequency is demonstrated. The white light, ranging from the IR to 150 nm, was generated by a self-trapped femtosecond Ti:Al2O3 laser pulse in atmospheric-pressure rare gases. Spectral intensities in the UV and the visible regions are 100 MW/nm and 1 GW/nm, respectively. The beam divergence was measured to be 1 mrad.
© 1995 Optical Society of America
Original Manuscript: June 23, 1995
Published: December 15, 1995
Hajime Nishioka, Wataru Odajima, Ken-ichi Ueda, and Hiroshi Takuma, "Ultrabroadband flat continuum generation in multichannel propagation of terrawatt Ti:sapphire laser pulses," Opt. Lett. 20, 2505-2507 (1995)