Investigation of nonlinear absorption coefficient (β) and nonlinear refraction (n2) of L-threoninium P-toluenesulfonate monohydrate organic single crystal using two laser sources

Abstract

Third order nonlinear optical properties of organic crystal L-threoninium P-toluenesulfonate monohydrate was investigated by ‘Z-scan’ technique employing two different laser sources under different intensities at 532 nm CW laser and 1064 nm pulsed laser respectively. Nonlinear absorption coefficient (αNL) and nonlinear refraction (n2) were evaluated at six different intensities using 532 nm CW laser source and with pulsed laser source (λ = 1064 nm) by changing the pulse rate keeping intensity same. It is found that this crystal possesses positive nonlinearity and exhibit saturation absorption.