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Ultrasensitive near-infrared cavity ring-down spectrometer for precise line profile measurement
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A cavity ring-down (CRD) spectrometer is built with a continuous-wave Ti:sapphire ring laser. Using a pair of high-reflective mirrors, the noise-equivalent minimum detectable absorption loss reaches over the spectral range of 780–830 nm. A thermal-stabilized Fabry-Perot interferometer is applied to calibrate the CRD spectrum with an accuracy of . The quantitative measurement is carried out for the line profile measurements of some overtone absorption lines of near 787 nm. Doppler determined line shape has been observed with milli-Torr acetylene gas in the ring-down cavity. The instrumental line width is estimated from the line profile fitting to be . It demonstrates that the CRD spectrometer with extremely high sensitivity is also very suitable for quantitative measurements including precise line profile studies in the near-infrared.
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