Abstract
Here, a sensitive reflection pump–probe technique is demonstrated for studying the optical nonlinear (NLO) properties of samples with a high linear absorptive coefficient at a certain wavelength. Light with a broad-angle spectrum around the Brewster angle is applied as the incident beam. An adjustable slit is utilized to select a part of the reflection angle, replacing the traditional rotation method in the reflection pump probe. The sensitivity of this technique is affected by the position and width of the slit. The closer to the Brewster angle, the more sensitivity the technique achieves. This technique can precisely control the angle of reflection, resulting in a significant enhancement with easier system operation. In addition, the simple optical path used here can be applied to other techniques for studying the properties of NLO samples. Experimentally, a normalized reflectivity enhancement is observed at 532 nm, and the impact of the incident angle on the pump-probe signal of the silicon crystal is investigated.
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Acknowledgements
The authors gratefully acknowledge the National Natural Science Foundation of China (11704273, 51607119), the National Safety Academic Fund (U1630103), and the Science and Technology Innovation Team of Guizhou Education Department (Grant No. [2023]094).
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This work was funded by Science and Technology Innovation Team of Guizhou Education Department, under Grant No. [2023]094.
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JY and YY contributed to the conception of the study; MD and JY performed the experiment and prepared Figs. 1, 2, 3, 4; ZL and YF contributed significantly to analysis and manuscript preparation; MD and WZ performed the data analyses and wrote the main manuscript text; XW and YS helped to perform the analysis with constructive discussions; all authors reviewed the manuscript.
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Dong, M., Yang, J., Zhou, W. et al. A broad-angle spectrum reflection pump–probe technique based on the Brewster angle. Appl. Phys. B 130, 35 (2024). https://doi.org/10.1007/s00340-023-08170-0
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DOI: https://doi.org/10.1007/s00340-023-08170-0