Recently saturation effects in nonlinear processes have attracted attention of scientific community for both fundamental research and application. However, accurate determination of the emergence of saturation is still challenging, especially when multiple orders of absorption get involved. Here we present a simple method to characterize saturation absorption using phase-modulated femtosecond lasers. Second harmonic generation and photocurrents are measured for GaP photodetector. For high incident intensity, higher order modulation signals emerge and exhibit much stronger intensity dependence. We found that the higher order modulation signal could serve as a sensitive probe for saturation absorption. The investigation could be useful in fabricating ultrafast switches and multiphoton microscopy.
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