Affiliation:
1. Physics Department, Atomic Energy Commission, P.O. Box 6091, Damascus, Syria.
Abstract
The Z-scan technique was employed to explore the third-order nonlinear optical properties of disperse red 13 organic chromophore solutions in tetrahydrofuran. A continuous-wave He–Ne laser (632.8 nm) was used as a source of irradiation. The nonlinear absorption and nonlinear refractive index coefficients of this dye were investigated. The results showed that this dye has a good nonlinear response with its real and imaginary quantities of third-order susceptibility. The solutions showed negative nonlinear refraction. The best obtained value of the third-order susceptibility was 6.37 × 10–3 esu at a dye concentration of 3.15 × 10–4 mol/L. Moreover, the nonlinear optical properties were enhanced with higher dye concentrations, and an elevated trend in nonlinear absorption and nonlinear refractive index coefficients was observed. Also, it was found that the reverse saturable absorption was the main mechanism responsible for the two-photon absorption effect in DSR13/THF samples.
Publisher
Canadian Science Publishing
Subject
General Physics and Astronomy
Reference35 articles.
1. Distortions in Z-scan spectroscopy
2. Femtosecond Z-scan measurements of nonlinear refraction in amino acid solutions
3. High-sensitivity, single-beam n_2 measurements
4. A general Z-scan theory
5. E.W. Van Stryland and M. Sheik-Bahae. Characterization techniques and tabulations for organic nonlinear materials. Edited by M.G. Kuzyk and C.W. Dirk. Marcel Dekker, New York. 1998. p. 655.