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Frequency-modulation spectroscopy with blue diode lasers

机译：蓝光二极管激光器的调频光谱

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摘要

Frequency-modulation spectroscopy provides ultrasensitive absorption measurements. The technique is especially adaptable to diode lasers, which can be modulated easily, and has been used extensively in the near-infrared and infrared spectral regions. The availability of blue diode lasers now means that the accessible wavelength region can be increased. We successfully demonstrate wavelength-modulation spectroscopy and two-tone frequency-modulation spectroscopy for the weak second resonance line of potassium at 404.8 nm and for the transition at 405.8 nm in lead, starting from the thermally populated 6p~(2) ~(3)P_(2) metastable level. Information on the modulation parameters is obtained with a fitting procedure. Experimental signal-to-noise ratios at different absorption levels are compared with theoretical signal-to-noise ratios and show good agreement. Detection sensitivities of 2×10~(-6) and 5×10~(-6) for wavelength and two-tone frequency-modulation spectroscopy, respectively, for a 120-Hz bandwidth are demonstrated.
机译：调频光谱提供超灵敏的吸收测量。该技术特别适用于二极管激光器，可以很容易地对其进行调制，并且已广泛应用于近红外和红外光谱区域。现在，蓝色二极管激光器的可用性意味着可以增加可访问的波长区域。我们成功地证明了波长调制光谱法和双音调频光谱法从热填充6p〜（2）〜（3）开始的钾离子在404.8 nm处的弱第二共振谱线和铅在405.8 nm处的跃迁。 P_（2）亚稳水平。有关调制参数的信息可通过拟合过程获得。将不同吸收水平下的实验信噪比与理论信噪比进行比较，并显示出良好的一致性。证明了对于120 Hz带宽，波长分别为2×10〜（-6）和5×10〜（-6）的检测灵敏度以及两音调频光谱的检测灵敏度。

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