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<p>Sensitive detection of trace gas molecules is critically important for various scientific and industrial applications. We present a wavelength-modulated cavity-enhanced two-photon absorption spectroscopy (WM-CETPAS) technique that integrates the Doppler-free precision of two-photon absorption with the noise suppression capability of wavelength modulation. This approach achieves both high sensitivity and high selectivity in molecular detection. As a demonstration, we measured <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="340_2025_8463_Article_IEq1.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="13" /> </InlineMediaObject> <EquationSource Format="TEX">\(^{13}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>13</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>CO<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="340_2025_8463_Article_IEq2.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="8" /> </InlineMediaObject> <EquationSource Format="TEX">\(_2\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>2</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation> in gas mixtures, confirming that the WM-CETPAS method enables real-time detection without interference from other molecular species. The method provides an opportunity to be a powerful tool for various applications, such as isotope analysis, environmental monitoring, and industrial process control.</p>

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Trace molecular detection with wavelength-modulated cavity-enhanced two-photon absorption spectroscopy

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Yu-Zhong Liu,
  • Wen-Tao Cai,
  • Yan-Dong Tan,
  • Tian-Peng Hua,
  • Cun-Feng Cheng,
  • Shui-Ming Hu

摘要

Sensitive detection of trace gas molecules is critically important for various scientific and industrial applications. We present a wavelength-modulated cavity-enhanced two-photon absorption spectroscopy (WM-CETPAS) technique that integrates the Doppler-free precision of two-photon absorption with the noise suppression capability of wavelength modulation. This approach achieves both high sensitivity and high selectivity in molecular detection. As a demonstration, we measured \(^{13}\) 13 CO \(_2\) 2 in gas mixtures, confirming that the WM-CETPAS method enables real-time detection without interference from other molecular species. The method provides an opportunity to be a powerful tool for various applications, such as isotope analysis, environmental monitoring, and industrial process control.