基于多级组合棱镜提高激光中心波长检测精度的研究

Improving Laser Center Wavelength Detection Accuracy Based on Multi-Level Combination Prisms

为了在保证抗干扰能力不下降的条件下提高对激光中心波长的检测精度,设计了多级组合棱镜系统,并提出了多级组合棱镜的干涉条纹拼接处理方法及相位耦合的计算公式。通过计算多级组合棱镜的干涉图强度、光程差函数及光谱分辨率,分析了采用三块子棱镜的组合结构的光谱获取,给出了用于分段干涉条纹拼接的处理方法及步骤,最终光谱分辨率可达2.875cm-1。实验采用3块材料一致的30mm×28mm×10mm的棱镜构成多级组合棱镜,对635.0nm标准激光进行相干处理。实验数据显示,分段的子棱镜分别采集得到了连续的光谱信息,再采用干涉条纹拼接处理方法后,经傅氏变换得到的光谱分布与标准光谱基本一致,而光谱分辨率得到了明显的提高。

In order to improve the spectral resolution of birefringence prism under the conditions of ensuring the quality of interference fringes image,the system used multi-level combination prisms and designed the method of interferometer fringes splice.According to calculation of the interferometer fringes intensity of multi-level combination prisms,the optical path difference function and the spectrum resolution,the present paper analyzed that the least spectrum resolution is 2.875 cm-1 in multi-level combination prisms of four prisms structure.The method of interferometer fringes splice was designed to splice the section interferometer fringes,and in experiment the size of multi-level combination prisms is 30 mm×28 mm×10 mm.The standard 635 nm laser for getting the interferometer fringes was dealed with.Experimental data show that the detection spectrum distribution of the 635.0 nm laser was distorted by the direct splicing of the interference fringes,while the detection spectrum distribution of the 635.0nm laser was consistent with the standard spectrum by the method of interferometer fringes splice.So the method can effectively avoid spectrum distortion by interferometer fringes splice in multi-level combination prisms.