Abstract

Knowing the value of nonlinear index of refraction is crucial for understanding how phase modulation affects intense ultra-short pulses propagating through a given material. Measurement of Kerr constant forces building of stand-alone and often complicated setups. Most popular one - Z-scan - requires excellent beam quality, perfect beam alignment and entails separate two-photon absorption measurements [1]. On the other hand, frequency-resolved optical gating (FROG) setups are nowadays a common equipment of ultra-fast laboratories where the complete ultra-short pulse characterization is an ever-growing need.

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