Abstract

Detailed measurement of spectral broadening in a poly-[2,4 hexadiyne-1,6 diol-bis-(p-toluene sulfonate)] (PTS) single crystal owing to self-phase modulation was performed as a function of wavelength by use of a Ti:sapphire laser producing 200-fs pulses at 720–920  nm and a Nd:YAG laser producing 50-ps pulses at 1064  nm. The nonlinear refractive index n2 of PTS at these wavelengths was determined from the measured phase shift. Group-velocity dispersion was estimated and found to have a negligible effect on the observed spectral broadening. The two-photon absorption coefficient α2 over this wavelength range was determined from nonlinear transmission measurements. The largest magnitude of n2 observed at 720  nm was 3.9×10-5cm2/MW. The results show that the magnitude of n2 monotonically decreases as wavelength is increased away from resonance, and two-photon absorption does not make a significant contribution to n2 at off-resonant wavelengths up to 1064  nm.

© 2001 Optical Society of America

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