一种基于劈尖干涉的激光波长测量装置的研究

基于激光在光学劈尖表面上产生干涉条纹的特点，设计了一种激光波长测定装置。利用线阵CCD将激光垂直照射光学劈尖表面时所生成的干涉条纹感应成电信号并转移输出，经过线性放大、模数转换后变成有限长的离散周期序列，通过快速傅里叶变换测定条纹间距来计算出激光波长，并用532 nm,632.8 nm,980 nm三种波长的激光进行了测试。测试结果表明该装置在背景光不是太强的情况下，性能令人满意，精确度较高,并能从虚拟仪器面板上直观形象地观察信号波形和结果，具有一定的实用性。

Study of laser wavelength determining device based on wedge interference

Based on the property that laser generates interference fringes on optical wedge,a device is designed to determine the wavelength of the incident laser.When laser is shining optical wedge vertically,a linear CCD is used to induce the interference fringes and output electric signal,then the signal is filtered,amplified and transformed into digital signal,which is a discrete periodic sequence with finite length.The laser wavelength can be calculated through determination of fringe gas by FFT,and three kinds of laser having wavelength of 532 nm,632.8 nm,980 nm are used for test.The test results indicate that the device has satisfactory property and perfect precision under low background.In addition,the signal wave and the experimental results can be observed intuitively on the front panel of the virtual instrument,and this device is practicable to a certain extent.