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一种干涉条纹运动的扫描式Talbot干涉仪被用于改变光纤Bragg光栅的写入Bragg波长。在系统中,光纤光栅是由来自相位掩模的±1级衍射光经平面镜反射后在远场形成紫外干涉条纹写入的,其中,相位掩模被用作±1级衍射光的分束器。值得注意的是通过干涉条纹的运动来扫描写入光纤光栅,有效降低了Talbot干涉仪对写入光源相干性的要求。
An interference fringe movement scanning Talbot interferometer was used to change the Bragg wavelength of a fiber Bragg grating. In the system, a fiber grating is written by ultraviolet interference fringes in the far field after ± 1st-order diffracted light from a phase mask is reflected by a plane mirror, and the phase mask is used as a beam splitter of ± 1st order diffracted light . It is noteworthy that the scanning fiber grating is scanned by interference fringe movement, which effectively reduces the requirement of Talbot interferometer to write light source coherence.