Direct compression of femtosecond optical pulses from a Ti:sapphire laser oscillator was realized with a cholesteric liquid crystal acting as a nonlinear 1D periodic Bragg grating. With a 6 μm thick sample, the pulse duration could be compressed from 100 to 48 fs. Coupled-mode equations for forward and backward waves were employed to simulate the dynamics therein, and good agreement between theory and experiment was obtained.
© 2013 Optical Society of America
Original Manuscript: September 12, 2013
Revised Manuscript: October 25, 2013
Manuscript Accepted: October 27, 2013
Published: November 22, 2013
Liyan Song, Shenhe Fu, Yikun Liu, Jianying Zhou, Vladimir G. Chigrinov, and Iam Choon Khoo, "Direct femtosecond pulse compression with miniature-sized Bragg cholesteric liquid crystal," Opt. Lett. 38, 5040-5042 (2013)