• Title/Summary/Keyword: quantum optics

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Quantitative Measurement of Ethane Using Mid-infrared Cavity Ring-down Spectroscopy

  • Yonghee Kim;Byung Jae Chun;Lim Lee;Kwang-Hoon Ko;Seung-Kyu Park;Taek-Soo Kim;Hyunmin Park
    • Current Optics and Photonics
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    • v.7 no.4
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    • pp.457-462
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    • 2023

  • Quantitative measurement of trace ethane is important in environmental science and biomedical applications. For these applications, we typically require a few tens of part-per-trillion level measurement sensitivity. To measure trace-level ethane, we constructed a cavity ring-down spectroscopy setup in the 3.37 ㎛ mid-infrared wavelength range, which is applicable to multi-species chemical analysis. We demonstrated that the detection limit of ethane is approximately 300 parts per trillion, and the measured concentration is in agreement with the amounts of the injected sample. We expect that these results can be applied to the chemical analysis of ethane and applications such as breath test equipment.

  • https://doi.org/10.3807/COPP.2023.7.4.457 인용 PDF

270-W 15-kHz MOPA System Based on Side-pumped Rod-type Nd:YAG Gain Modules

  • Cha, Yong-Ho;Yang, Myoung-Yerl;Ko, Kwang-Hoon;Lim, Gwon;Han, Jae-Min;Park, Hyun-Min;Kim, Taek-Soo;Roh, Si-Pyo;Jeong, Do-Young
    • Journal of the Optical Society of Korea
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    • v.12 no.4
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    • pp.298-302
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    • 2008

  • We have developed a 270-W 15-kHz MOPA system based on side-pumped rod-type Nd:YAG gain modules. The master oscillator is a 3-W 15-kHz $TEM_{00}$ $Nd:YVO_4$ laser with a pulse duration of 30 ns. To preserve the high beam quality during the amplification, we use image relay and polarization rotation which can simultaneously compensate for thermal lensing and thermal birefringence generated in the rod-type gain modules. After the amplification to 270 W with six rod-type gain modules, the beam quality factor ($M^2$) of the amplified laser beam is 5-10, and the pulse duration is maintained at 30 ns.

  • https://doi.org/10.3807/JOSK.2008.12.4.298 인용 PDF KSCI