Spectral transmittance measurement nonlinearity of a (280-540) nm spectrophotometer based on a tunable femtosecond pulse laser

Yinuo Xu; Yingwei He; Houping Wu; Weimin Wang; Xiangliang Liu; Yangting Fu; Xufeng Jing; Haiyong Gan

doi:10.1117/12.2550286

12 March 2020 Spectral transmittance measurement nonlinearity of a (280-540) nm spectrophotometer based on a tunable femtosecond pulse laser

Yinuo Xu, Yingwei He, Houping Wu, Weimin Wang, Xiangliang Liu, Yangting Fu, Xufeng Jing, Haiyong Gan

Author Affiliations +

Proceedings Volume 11437, 2019 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications; 114370V (2020) https://doi.org/10.1117/12.2550286
Event: 2019 International Conference on Optical Instruments and Technology, 2019, Beijing, China

Abstract

Femtosecond pulses tunable in (280-540) nm were generated via second and third harmonic generation processes from a Ti:Sapphire femtosecond laser with a 80 MHz pulse repetition rate. The temporal widths of the pulses are ~200 fs and the spectral bandwidths are <10 nm. These pulses can be used for spectral transmittance measurement using an integrating sphere photodetector with less than 0.1% fluorescence effect. The spectral transmittance measurement nonlinearity of the femtosecond pulse laser spectrophotometer was characterized using a double-path scheme for the incident power level from 1 mW to 10 μW. The nonlinearity results were compared with those obtained using a 532 nm continuous wave laser at similar power levels. The spectrophotometer can be well applied for the spectral transmittance measurement of a wide variety of neutral optical materials after nonlinearity corrections.

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Yinuo Xu, Yingwei He, Houping Wu, Weimin Wang, Xiangliang Liu, Yangting Fu, Xufeng Jing, and Haiyong Gan "Spectral transmittance measurement nonlinearity of a (280-540) nm spectrophotometer based on a tunable femtosecond pulse laser", Proc. SPIE 11437, 2019 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications, 114370V (12 March 2020); https://doi.org/10.1117/12.2550286

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KEYWORDS

Femtosecond phenomena

Pulsed laser operation

Integrating spheres

Transmittance

Crystals

Second-harmonic generation

Photodetectors

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