High-resolution spectroscopy using interleaved 100 GHz optical frequency comb scanned by phase modulator |
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Authors: | Tatsutoshi Shioda Kenichiro Fujii Takashi Kurokawa |
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Institution: | a Department of Electric Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japanb Graduate School of Engineering, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho Koganei, Tokyo 184-8588, Japan |
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Abstract: | A high-resolution spectroscopy technique is proposed with an optical phase modulator combined with an interleaved optical frequency comb. The optical phase modulator and a frequency-locked laser light guarantee a spectral resolution less than 1 MHz on an absolute frequency axis. A wide measurement frequency range was realized using a 25 GHz optical frequency comb lying over a 4 THz frequency region. An extraction of single tooth intensity from the comb was realized by a heterodyne technique with a frequency-tunable laser used as a local oscillator. Also, the 25 GHz optical frequency comb was interleaved to generate four 100-GHz combs for removing the crosstalk from the 25 GHz neighboring sidebands in the teeth. This proposed spectroscopy technique was experimentally demonstrated with a resonator of less than 1 MHz linewidth and a H13C14N gas cell. Thus, a measurement frequency range higher than 4 THz (1530 nm-1560 nm) was confirmed with an effective spectral resolution 100 kHz order. In addition, the characteristics of the proposed system were compared with those of the previous system with a single-sideband (SSB) optical modulator. |
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Keywords: | High-resolution spectroscopy Optical phase modulator Optical frequency comb Heterodyne detection method |
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