Ultrahigh performance spectroscopy based on nonlinear optical heterodyne detection

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630170
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Measurement engineering
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: TANAKA YOSUKE 東京農工大学, 工学(系)研究科(研究院), 准教授 (20283343)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 二光子吸収 / 分光計測 / 距離計測

Outline of Final Research Achievements

In this study, we have proposed and confirmed the principle of "nonlinear optical heterodyne detection" based on nonlinear output of a photodetector. We also have investigated its applications. The proposed method is expected to realize wide-band, polarization-independent, and high-resolution spectroscopy. We have confirmed the principle by sensitively detecting the spectra of a light transmitted from a sample. Furthermore, we have got an idea of applying the method to distance measurement. We have detected the reflection point at the end of 50-km optical fiber. We have also measured a small displacement with this method. These techniques are applicable to measurement of refractive index change and concentration change for a sample. In this study, we have successfully confirmed the effectiveness of the proposed method.

Free Research Field

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