Miniature Fourier transform spectrometer based on wavelength dependence of half-wave voltage of a LiNbO3 waveguide interferometer
Miniature Fourier transform spectrometer based on wavelength dependence of half-wave voltage of a LiNbO3 waveguide interferometer
复制标题
基于 LiNbO3 波导干涉仪半波电压波长依赖性的微型傅里叶变换光谱仪
DOI：
10.1364/ol.39.003923
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发表时间：
2014-07-01
期刊：
影响因子：
3.6
通讯作者：
Qi, Zhi-mei
中科院分区：
文献类型：
--
作者：
Li, Jinyang;Lu, Dan-feng;Qi, Zhi-mei
针对基于LiNbO_3(LN)波导型马赫-曾德尔干涉仪(MZI)调制器的小型静态傅里叶变换(FT)光谱仪的研制，提出了一种简单可靠的光谱恢复方法。该方法考虑了光程长度差(OPD)对波长的依赖关系，并允许我们使用一个非线性电压斜坡来调制OPD。该方法基于半波电压的色散，对于所用的LN波导MZI，半波电压是波长的单调多项式函数。根据测量的半波电压色散，可以在MZI为单模器件的近红外区域的每个波长精确地确定作为调制电压的线性函数的OPD。在此基础上，利用LN波导型MZI调制器制作了FT光谱仪样机。实验结果表明，该光谱仪可用于激光波长的精确测量和液体吸光度的测定。(C)2014年美国光学学会
A simple and reliable spectrum-retrieval method was proposed for the development of miniature stationary Fourier transform (FT) spectrometers based on a LiNbO3 (LN) waveguide Mach-Zehnder interferometer (MZI) modulator. The method takes into account the wavelength dependence of the optical pathlength difference (OPD) and allows us to use a nonlinear voltage ramp to modulate the OPD. The method is based on the dispersion of the half-wave voltage, which was measured to be a monotonous polynomial function of the wavelength for the LN waveguide MZI used. With the measured dispersion of the half-wave voltage, the OPD, as a linear function of the modulating voltage, can be accurately determined at each wavelength in the near-infrared region in which the MZI used is a single-mode device. A prototype FT spectrometer was prepared using a LN waveguide MZI modulator based on the above method. The experimental results demonstrated that the spectrometer can be used for accurate determination of the laser wavelength and for liquid absorptiometry. (C) 2014 Optical Society of America