Probing saturation effects in nonlinear process with phase-modulated femtosecond lasers

Chuanliang Wang; Ahsan Ali; Jinlei Wu; Khadga Jung Karki

doi:10.1117/12.2688904

26 November 2023 Probing saturation effects in nonlinear process with phase-modulated femtosecond lasers

Chuanliang Wang, Ahsan Ali, Jinlei Wu, Khadga Jung Karki

Proceedings Volume 12775, Quantum and Nonlinear Optics X; 127751M (2023) https://doi.org/10.1117/12.2688904
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Conference Poster

Abstract

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.

Citation Download Citation

Chuanliang Wang, Ahsan Ali, Jinlei Wu, and Khadga Jung Karki "Probing saturation effects in nonlinear process with phase-modulated femtosecond lasers", Proc. SPIE 12775, Quantum and Nonlinear Optics X, 127751M (26 November 2023); https://doi.org/10.1117/12.2688904

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