23 September 2016 Degenerate frequency two beam coupling in organic solutions using nanosecond laser pulses
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Abstract
Previously, we presented the experimental evidence for a degenerate frequency two beam coupling (TBC) in two photon absorbing (2PA) organic solutions. It has been well established that the two critical requirements for TBC are a nonlinear refractive index with a finite lifetime and that the interacting fields must have non-degenerate frequencies. However, degenerate frequency coupling has been shown for fields containing a time-dependent phase, i.e. a frequency chirp. This chirp can either be intrinsic to the fields or induced by self- and cross- phase modulation (S/XPM). For nanosecond pulses, the relatively small intrinsic chirp of the fields is negligible compared to the strong cumulative effects of population redistribution which generates large S/XPM. A S/XPM-mediated theoretical treatment for degenerate frequency TBC is presented along with numerical simulations using known nonlinear optical parameters to model the experimental results.
Conference Presentation
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Jonathan E. Slagle, Jonathan E. Slagle, Joseph W. Haus, Joseph W. Haus, Daniel G. McLean, Daniel G. McLean, Shekhar Guha, Shekhar Guha, } "Degenerate frequency two beam coupling in organic solutions using nanosecond laser pulses", Proc. SPIE 9939, Light Manipulating Organic Materials and Devices III, 99390E (23 September 2016); doi: 10.1117/12.2237034; https://doi.org/10.1117/12.2237034
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