Measurement and uniformization of power distribution on the prism for biomedical applications of mid-infrared, attenuated-total-reflection spectroscopy

T. Koyama; S. Kino; T. Sasaki; Y. Wada; R. Kasahara; Y. Oba; Y. Matsuura

doi:10.1117/12.2582270

5 March 2021 Measurement and uniformization of power distribution on the prism for biomedical applications of mid-infrared, attenuated-total-reflection spectroscopy

T. Koyama, S. Kino, T. Sasaki, Y. Wada, R. Kasahara, Y. Oba, Y. Matsuura

Author Affiliations +

Proceedings Volume 11635, Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXI; 116350O (2021) https://doi.org/10.1117/12.2582270
Event: SPIE BiOS, 2021, Online Only

Abstract

To obtain uniform power distribution on the ATR prism for biomedical spectroscopy system, the power intensity mapping on the prism is precisely measured by using a newly developed probing technique. It is found that the distribution of QCL based system is less uniform than that of the FT-IR based system due to the high coherency of the laser beam. To homogenize the distribution, a lens is introduced to diffuse the light and the incident beam is inclined to increase the number of reflections in the prism. As a result, we confirmed that the measurement error of in-vivo experiments is suppressed.

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T. Koyama, S. Kino, T. Sasaki, Y. Wada, R. Kasahara, Y. Oba, and Y. Matsuura "Measurement and uniformization of power distribution on the prism for biomedical applications of mid-infrared, attenuated-total-reflection spectroscopy", Proc. SPIE 11635, Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXI, 116350O (5 March 2021); https://doi.org/10.1117/12.2582270

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