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High-resolution GaP Terahertz Spectrometer and Its Application to Detect Defects in Gamma-irradiated Glucose Crystal

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Abstract

We developed high-resolution GaP THz signal generator using Cr:Forsterite lasers with gratings as both a pump and a signal beam for difference-frequency generation. A line width of less than 500 MHz and a wide tunable frequency range (0.6–6.2 THz) provide sufficient resolution for measuring materials with sharp absorption bands using the generator as the light source for a THz spectrometer. This is suitable for materials such as gases or solid samples at low temperatures. We demonstrated the detection of defects in organic materials, as they appear as slight deviations in the absorption frequency in the THz region.

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Acknowledgement

This work is partly supported by Grant-in-Aid for Scientific Research (Creative Scientific Research, 17GS0209) by Ministry of Education, Culture, Sports, Science and Technology (MEXT) and Japan Society for the Promotion of Science (JSPS). We would like to thank Dr. Hiroo Inokuchi for giving us the knowledge about defects detection in organic compounds. We are also grateful to Mr. Jiro Shibata (Terahertz laboratory, Co. Ltd.) for valuable discussion.

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Authors and Affiliations

  1. Semiconductor Research Institute, Aoba 519–1176, Aramaki, Aoba-ku, Sendai, 980–0845, Japan

    Jun-ichi Nishizawa, Tetsuo Sasaki, Ken Suto & Takashi Yoshida

  2. Terahertz laboratory, Co.Ltd, Maedamen 50–1, Mitsumata, Komagata-cho, Yuzawa, Akita, 012–0104, Japan

    Masahiko Ito

  3. Department of Material Science, Tohoku University, Aoba-yama 6–6–11–1021, Sendai, 980–8579, Japan

    Tadao Tanabe

Authors
  1. Jun-ichi Nishizawa
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  2. Tetsuo Sasaki
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  3. Ken Suto
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  4. Masahiko Ito
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  5. Takashi Yoshida
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  6. Tadao Tanabe
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Correspondence to Tetsuo Sasaki.

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Nishizawa, Ji., Sasaki, T., Suto, K. et al. High-resolution GaP Terahertz Spectrometer and Its Application to Detect Defects in Gamma-irradiated Glucose Crystal. Int J Infrared Milli Waves 29, 291–297 (2008). https://doi.org/10.1007/s10762-007-9322-9

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  • DOI: https://doi.org/10.1007/s10762-007-9322-9

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