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首页> 外文期刊>Applied optics >Background signals in wavelength-modulation spectrometry with frequency-doubled diode-laser light. I. Theory
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Background signals in wavelength-modulation spectrometry with frequency-doubled diode-laser light. I. Theory

机译：倍频二极管激光在波长调制光谱中的背景信号。一，理论

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摘要

Various types of background signals appear when wavelength-modulated (WM) diode-laser light is frequency doubled. We present a theoretical analysis of such background signals in terms of a previously derived formalism for WM spectrometry that is based on a Fourier series. Explicit expressions for various nf harmonics of the background signals are derived. The analysis shows that 2f detection will be plagued by significant background signals when frequency-doubled WM diode-laser light is used. It also demonstrates that 4f and 6f detection will experience background signals but not, however, to the same extent as 2f detection. The analysis illustrates clearly how the various nf harmonics of the background signals depend on entities such as modulation amplitude, associated intensity modulation, dispersion of the frequency-doubling material, laser power, and detuning. The background signals can take both positive and negative values, depending on the relation between these entities. Guidelines for how to minimize these background signals are given.
机译：当波长调制（WM）二极管激光的频率加倍时，会出现各种类型的背景信号。我们根据基于傅立叶级数的WM光谱的先前得出的形式主义，对此类背景信号进行了理论分析。推导了背景信号的各种nf谐波的明确表达式。分析表明，当使用倍频的WM二极管激光时，2f检测将受到大量背景信号的困扰。它还表明4f和6f检测将经历背景信号，但是不会达到2f检测的程度。分析清楚地说明了背景信号的各种nf谐波如何取决于实体，例如调制幅度，关联的强度调制，倍频材料的色散，激光功率和失谐。背景信号可以取正值也可以取负值，具体取决于这些实体之间的关系。给出了如何最小化这些背景信号的指南。

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