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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Suppression of Side Fringes in Low-Coherence Interferometric Measurements Using Gain- or Loss-Modulated Multimode Laser Diodes
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Suppression of Side Fringes in Low-Coherence Interferometric Measurements Using Gain- or Loss-Modulated Multimode Laser Diodes

机译：使用增益或损耗调制多模激光二极管在低相干干涉测量中抑制边缘

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摘要

We examined three commercially available Fabry-Perot laser diodes with different oscillation wavelengths (660, 800, and 1550 nm) to suppress side fringes appearing under gain- or loss-modulation operation in low-coherence interferometric fringe measurements. For the shorter-wavelength laser diodes (660 and 800 nm), the amplitude of the maximum side fringe was effectively suppressed to 4% of the main fringe amplitude by utilizing the linewidth broadening effect of gain-switched laser diodes due to the generation of frequency chirping, and also by superimposing a multimode spectrum from another laser diode of the same kind. For the 1550 nm laser diode, however, the above approaches were less effective because noticeable gain saturation in the laser diode disturbed the transition of the spectral shape from a characteristic multimode spectrum to a continuum.
机译：我们检查了三种市售的Fabry-Perot激光二极管，它们具有不同的振荡波长（660、800和1550 nm），以抑制在低相干干涉条纹测量中在增益或损耗调制操作下出现的条纹。对于较短波长的激光二极管（660和800 nm），由于频率的产生，通过利用增益开关激光二极管的线宽展宽效应，最大侧边缘的幅度被有效地抑制为主边缘幅度的4％。声，也可以叠加来自另一种相同激光二极管的多模光谱。但是，对于1550 nm激光二极管，上述方法效果较差，因为激光二极管中明显的增益饱和会干扰光谱形状从特征多模光谱到连续光谱的过渡。

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