Spatial self-phase modulation in the H2TPP(OH)4 doped in Boric Acid Glass

TL;DR

This paper investigates spatial self-phase modulation in H2TPP(OH)4 doped boric acid glass, demonstrating self-diffraction rings and analyzing thermal effects using Z-scan, revealing how concentration influences the nonlinear optical response.

Contribution

It presents the first observation of SSPM in H2TPP(OH)4 doped boric acid glass and compares self-diffraction with Z-scan measurements for different concentrations.

Findings

Self-diffraction rings observed at 671 nm excitation.

Thermo-optic coefficients estimated from Z-scan.

Comparison of SSPM and Z-scan results across concentrations.

Abstract

Self-diffraction rings or spatial self-phase modulation (SSPM) was observed in tetra-phenyl porphyrin derivative 5,10,15,20 - meso-tetrakis (4-hydroxyphenyl) porphyrin (H2TPP(OH)4) doped in boric acid glass (BAG) at 671 nm excitation wave-length lying within the absorption band of sample with TEM00 mode profile. Intensity modulated Z-scan was performed on these systems to study the thermal diffusion and to estimate the thermo-optic coefficients. The results obtained from self-diffraction rings experiment and modulated Z-scan are compared and analyzed for different concentration.