Nonlinear-Crystals-Based Optical Transient Detection System with Femtosecond Pulses

Optical transient detection (OTD) is an adaptive interferometric device that detects temporal changes while suppressing static background, improving contrast when measuring intensity and phase. A transient detection microscope was demonstrated by Cudney et al. [1], and most systems are based on photorefractive two-wave mixing [2] in the visible range and using continuous-wave lasers.