• Aithal, Shubrajyotsna
• S., Aithal P.
• K., Bhat G.

Abstract

onlinear absorption study is performed in 4-[4-(Dimethylamino)styryl]-1- docosyl pyridinium bromide(DASPB) doped in PAMA-PA polymer film at linear absorbing region using cw, nanosecond and picosecond532 nm laser beams and in two photon absorbing region using pico-second 800 nm, 900 nm and 1,000 nm laser beams. The linear transmission of dye in PMMA-PA film was about 10 %. The nonlinear absorption propertiesleading to optical limiting using 532 nm pico second and nano second pulses are studied. From the results, it canbe noted that at very low input intensity, linear transmission is preserved, with increase in input intensityDASPB starts to contribute to saturation absorption which increases the transmission above linear level, and athigher intensities the excited state frequency up-converted fluorescence (nonlinear absorption) starts tocontribute and it dominates with further increase in intensity. This kind of behavior has interesting applicationsin optical limiting and optical switching. ; Other ; {"references" : [ "[1] D. J. Hagan, “Optical Limiting,” in Handbook of Optics, Vol. IV, M. Bass, Ed, (Optical Society Of America (2000)", "[2] R. C. Hollins, “Goals, Architecture, and Materials for broadband Eye protection”, Nonlinear Optics, 27, 1-11, (2001)", "[3] P. Sreeramana Aithal, P. Prem Kiran and D. Narayana Rao, Optical limiting studies in photorefractive pure and iron doped BSO crystal, J. Nonlin. Opt. Principles and Materials, 9, 2, 217 - 225 (2000)", "[4] M. Albota, D. Beljonne, J.W. Perry, G. Subramanium, and C. Xu., Science, 281, p 1653 (1998)", "[5] B. A. Reinhardt, L. L. Brott, S. J. Clarson, R. Kannan and A. G. Dillard, “Functionalization of Thermally Stable Third-Order NLO Chromophores” Mater. Res. Soc. Sympo. Proc. 479, MRS, 3-8, (1997)", "[6] G. S. He, G. C. Xu, P. N. Prasad, B.A. Reinhardt, J. C. Bhatt and A.G. Dillard, “Two-photon absorption and optical limiting properties of novel organic compounds,” Opt. Lett., 20, 435-437, (1995)", "[7] Z. Sun, M. Tong, H. Zeng, L. Ding, Z. Wang, J. Dai, G. Bian and Z. Xu, “Nanosecond reverse saturable absorption and optical limiting in (Me4N)[Cd(dmit)(Sph)2],” J. Opt. Soc. Am. B, 18, 1464-1468, (2001)" ]}

Topics

• impedance spectroscopy
• compound
• polymer
• organic compound
• iron
• functionalization
• additive manufacturing