Determination of Third Order Nonlinear Optical Parameters-Nonlinear Refraction, Nonlinear Absorption and Susceptibility of Guanidinium Benzenesulfonate Organic Single Crystal with a Q-Switched Nd-YAG Laser at Two Excitation Wavelengths

Third-order nonlinear optical behavior, i.e., nonlinear refraction (n(2)), absorption coefficient (beta), and third-order susceptibility chi((3))of an organic single crystal guanidinium benzenesulfonate are investigated under the excitation of Q-switched Nd-YAG laser pulsed radiations (532 nm and 1064 nm) by Z-scan method at different intensities. The calculated values of (beta), (n(2)) and chi((3)) at 532 nm are from 0.38(cm/GW) to 0.65(cm/GW), -3.36 x 10(-7)(cm(2)/GW) to -5.37 x 10(-7)(cm(2)/GW) and 1.28 x 10(-11) (esu) to 2.20 x 10(-11) (esu) at the beam intensities of 0.38 GW/cm(2) to 0.92 GW/cm(2) respectively while the values of (beta), (n(2)) and chi((3)) at 1064 nm are from 0.45(cm/GW) to 0.65 (cm/GW), -3.36 x 10(-7)(cm(2)/GW) to -5.82 x 10(-7)(cm/GW) and 0.38 to 0.92 GW cm(-2) respectively at the beam intensities of 0.52 to 0.93 GW cm(-2). It is seen that crystal possesses a positive absorption coefficient, negative nonlinearity, and RSA, and can be a potential candidate for different practical device applications.