Interplay Between Self-Focusing And Multiphoton Absorption: Beam Distortion And Z-Scan Measurements
Summary form only given. Single crystals of polydiacetylene PTS have experimentally shown unique nonlinear optical properties. Four photon absorption (4PA) is very large, (α4 = 0.25 ± 0.05 cm5/GW3) at 1600 nm. Furthermore, PTS has a large non-resonant intensity-dependent refractive index coefficient, leading to self-focusing (SF), (n2 = [4.0 ± 0.5] ·10-4 cm2/GW). This offers a unique opportunity to study nonlinear beam propagation in regimes previously unavailable experimentally. Large SF occurs already at the distances about 300-500 microns with peak input intensities of several GW/cm2. We investigated the interplay between multiphoton absorption and SF, which results in severe beam distortion and affects 4PA Z-scan measurements on relatively thick samples.
Technical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001
Number of Pages
Article; Proceedings Paper
Source API URL
Polyakov, S.; Yoshino, F.; and Stegeman, G., "Interplay Between Self-Focusing And Multiphoton Absorption: Beam Distortion And Z-Scan Measurements" (2001). Scopus Export 2000s. 342.