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.
