楔块调整式Talbot干涉仪改变写入Bragg波长的调谐误差  

Tuning error of wedge-adjusted Talbot interferometer for changing inscribed Bragg wavelength

作　　者：李川[1] 张以谟[2] 田学飞[2] 刘铁根[2] 吴晟[1] 

机构地区：[1]昆明理工大学信息工程和自动化学院,昆明650051 [2]天津大学现代光学仪器研究所光电信息技术科学教育部重点实验室,天津300072

出　　处：《光学技术》2004年第1期80-82,共3页Optical Technique

基　　金：国家自然科学基金(60077023);云南省自然科学基金(2002F0004R)的资助。

摘　　要：在楔块调整式Talbot干涉仪中,光纤Bragg光栅的写入区为直接由相位模板衍射的±1级衍射光束形成的干涉条纹的近场干涉区,和由±1级衍射光束经两平面镜反射后形成的可调谐写入Bragg波长的干涉条纹的远场干涉区。在改变写入光纤光栅Bragg波长的过程中,光纤光栅的Bragg波长是由平面镜的交叉角决定的,而且,影响调谐精度的三种主要因素被控制在光纤光栅生产允许的范围内,即推动机构的位移误差系数Cd为～-0.08nm/μm,楔块的倾斜误差系数Cα为-0.15～0.23nm/(′),和转动机构的传动角误差系数Cβ为～-0.08nm/(′)。In the wedge-adjusted Talbot interferometer, the writing regions of grating are the near field interferometer region formed directly by the ±1 order diffractive beams through the phase mask, and the far field interferometer region formed by the ±1 order diffractive beams reflected by the two mirrors. In the process of changing the inscribed Bragg wavelength of grating, the Bragg wavelength of grating is defined by the mutual angle of two mirrors. Furthermore, the three main factors of disturbing tuning precision are limited to the admission of the fabrication of fiber Bragg grating, i.e., the displacement coefficient C_d of drive machine is ～-0.08 nm/μm, the slope error coefficient C_α of wedge is -0.15～0.23 nm/(′), and the transmission angle error coefficient C_β of rotation machine is ～-0.08 nm/(′).

关 键 词：楔块调整式 Talbot干涉仪 Bragg波长 调谐误差 调整器 移动 转动 

分 类 号：TH744.3[机械工程—光学工程]