Scanned Talbot interferometer based on fiber translation for changing written Bragg wavelength

摘要

A scanned Talbot interferometer based on shifting phase mask and fiber is developed to change the inscribed Bragg wavelength. In the scanned Talbot interferometer with scan translation platform and fiber translation platform, the ±1 order diffraction light beams form the interference fringe in the far field, thereinto, the fiber translation platform drives the fiber exposing in the interference fringe, and the scan translation platform causes the fiber shifting in the interference fringe to point-by-point write grating in the fiber. Followed the size of interference fringe is decreases from 10 mm to about fraction of a mm, the coherence length of light beams is reduced distinctly. It is important that the length of mirror could be reduced to the size of interference fringe. Additionally, the pulse energy of light source is also reduced evidently.