High throughput time-stretch near infrared spectrometry of low transmittance samples via optical waveguide

S. Shimizu; H. Sera; H. Kawagoe; J. Sahara; K. Watanabe; K. Shinoyama; T. Nagashima; T. Yokoyama; A. Ikarashi; G. Yamada

doi:10.1117/12.3000431

12 March 2024 High throughput time-stretch near infrared spectrometry of low transmittance samples via optical waveguide

S. Shimizu, H. Sera, H. Kawagoe, J. Sahara, K. Watanabe, K. Shinoyama, T. Nagashima, T. Yokoyama, A. Ikarashi, G. Yamada

Author Affiliations +

Proceedings Volume 12870, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications IX; 1287004 (2024) https://doi.org/10.1117/12.3000431
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

Time-stretch spectroscopy has the potential for high-speed inspection application. Currently, the low output power of chirped pulses limits the throughput and targets. We applied Arrayed Waveguide Gratings (AWGs) to time-stretch spectroscopy and achieved a high output power of 90 mW, which is about ten times higher than conventional method. In this study, we performed Near-Infrared (NIR) spectroscopy of low-transmittance samples with the developed time-stretch spectrometer. The absorbance spectrum of liquid samples was measured within ⪅1 ms/sample even with an optical attenuation by an ND filter (OD 3.8). In addition, we can estimate the volume fraction of highly scattering samples with a high accuracy (R² = 0.996) in approximately 5 ms. This result demonstrates the potential of our spectrometer for quantitative spectral analysis of highly scattering samples.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

S. Shimizu, H. Sera, H. Kawagoe, J. Sahara, K. Watanabe, K. Shinoyama, T. Nagashima, T. Yokoyama, A. Ikarashi, and G. Yamada "High throughput time-stretch near infrared spectrometry of low transmittance samples via optical waveguide", Proc. SPIE 12870, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications IX, 1287004 (12 March 2024); https://doi.org/10.1117/12.3000431

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