Measurement of the complex nonlinear refractive index of single crystal p-toluene sulfonate at 1064 nm

Abstract

Z‐scan at 1064 nm was used with single, 35 ps pulses to measure the nonlinear refraction and absorption in single crystal PTS (p‐toluene sulfonate). Detailed analysis of the Z‐scan data based on Δn=n₂I+n₃I² and Δα=α₂I+α₃I² yielded n₂=5(±1)×10⁻¹² cm²/W, α₂=100(±20) cm/GW, n₃=−5(±1)×10⁻²¹ cm⁴/W² and α₃=−5(±1) cm³/GW.² The resulting two photon figure of merit T for PTS is marginal for high throughput, all‐optical waveguide switching at 1064 nm.