TWO-PHOTON ABSORPTION SPECTROSCOPY OF A ¹³CO₂ VIBRATIONAL TRANSITION
Liu, Yu-Zhong
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TD05_1.pptx
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https://hdl.handle.net/2142/122363
Description
Title
TWO-PHOTON ABSORPTION SPECTROSCOPY OF A ¹³CO₂ VIBRATIONAL TRANSITION
Author(s)
Liu, Yu-Zhong
Contributor(s)
Hu, Shui-Ming
Cheng, Cunfeng
Issue Date
2023-06-20
Keyword(s)
Instrument/Technique Demonstration
Abstract
Two-photon absorption spectroscopy is an ideal method for precision measurements of molecular energy levels and trace gas concentration. We report a two- photon absorption of the Q(36) rovibrational transition of ¹³CO₂, measured by cavity- enhanced absorption spectroscopy (CEAS) at λ = 2.8 µm. The high signal-to-noise ratio of two-photon absorption spectra was obtained by optical locking of a narrow-linewidth mid-infrared laser to a high finesse cavity. One longitudinal mode of the cavity was shifted to scan the frequency, calibrated by an optical frequency comb. We studied the properties of the two-photon absorption spectrum. It is expected that this method can be applied in the field of molecular frequency reference and high-sensitivity detection.
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6695.pdf
TD05_1.pptx
