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首页> 外文期刊>Applied optics >Background signals in wavelength-modulation spectrometry by use of frequency-doubled diode-laser light. II. Experiment
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Background signals in wavelength-modulation spectrometry by use of frequency-doubled diode-laser light. II. Experiment

机译：通过使用倍频二极管激光，在波长调制光谱法中的背景信号。二。实验

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摘要

In an accompanying paper [Appl. Opt. 40, 783-793 (2001)], we predict the existence of background signals from a frequency-doubled wavelength-modulated diode-laser system. We now demonstrate and characterize various nf harmonics of such background signals from a system producing light in the 422-nm region by use of a single-pass KNbO_(3) crystal with respect to the modulation amplitude, the laser center frequency, and the crystal temperature. It is demonstrated that 2f detection is plagued by considerably larger amounts of background signal than is detection at other higher, even harmonics. This result implies that 4f or 6f detection is often to be preferred in comparison with 2f detection when frequency-doubled wavelength-modulation spectrometry (WMS) is to be used. This preference is illustrated by the detection of Ca in an acetylene-air flame. It is also shown that the background signals have a much stronger dependence on the modulation amplitude than do the analytical signals. This difference implies that the optimum detectability for frequency-doubled WMS is often reached for modulation amplitudes lower than those normally used. An analysis of the effect of a finite temperature stability of the doubling crystal on the drift of the background signals as well as on the detectability is included. The results verify the theoretical description given in our accompanying paper.
机译：在随附的论文中[Appl。选择。 40，783-793（2001）]，我们预测了倍频波长调制二极管激光系统中背景信号的存在。现在，我们通过使用单次通过KNbO_（3）晶体对调制幅度，激光中心频率和晶体进行演示，并表征来自系统在422 nm区域产生光的此类背景信号的各种nf谐波温度。事实证明，与其他更高甚至偶次谐波的检测相比，2f检测受到的背景信号数量要大得多。该结果表明，在使用倍频波长调制光谱法（WMS）时，与2f检测相比，通常首选4f或6f检测。通过在乙炔空气火焰中检测到Ca可以说明这种偏爱。还表明，与分析信号相比，背景信号对调制幅度的依赖性要强得多。这种差异意味着，对于调制幅度比通常使用的幅度低的WMS，通常可以达到倍频WMS的最佳检测能力。包括对倍增晶体的有限温度稳定性对背景信号漂移以及可检测性的影响的分析。结果证实了我们所附论文中给出的理论描述。

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