Time dependent diffraction ring patterns in bromothymol blue dye doped PMMA film under irradiation with continuous wave green laser light

• DOI: 10.1007/s12648-013-0334-0
• Publication Date: 2013-05-30T11:53:22Z
• Authors: F. A. Al-Saymari; H. A. Badran; A. Y. Al-Ahmad; C. A. Emshary
• Keywords: Bromothymol blue; Poly(N-isopropylacrylamide)

Diffraction ring patterns are generated in bromothymol blue (BTB) doped poly methyl methacrylate (PMMA) film with the aid of visible light from a solid state laser of Gaussian distribution. Temporal evolution of patterns i.e. the number of rings increases as time elapse is observed. Based on the experimental findings, change in refractive index (∆n) effective nonlinear refractive index (n 2) and variation of refractive index with temperature (dn/dT) have been obtained as 0.0025, 1.45 × 10−6 cm2 W−1, 1.69 × 10−5 K−1 respectively. Obtained results suggest the possibility of using BTB doped PMMA in data storage, recording and holography.