Abstract
Detailed measurement of spectral broadening in a poly-[2,4 hexadiyne-1,6 diol-bis-(-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 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 over this wavelength range was determined from nonlinear transmission measurements. The largest magnitude of observed at 720 nm was . The results show that the magnitude of monotonically decreases as wavelength is increased away from resonance, and two-photon absorption does not make a significant contribution to at off-resonant wavelengths up to 1064 nm.
© 2001 Optical Society of America
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