Method for efficiently fabricating Bragg grating on photonic crystal fiber

The invention belongs to the grating preparation technical field and provides a method for efficiently fabricating a Bragg grating on a photonic crystal fiber. The method includes the following steps of: selective expansion processing: selective expansion processing is performed on a grating region to be processed of the photonic crystal fiber, so that a part of cladding holes of the grating region to be processed of the photonic crystal fiber can collapse, so that a local simplified cladding region can be formed; and Bragg grating preparation: laser grating etching is performed on the simplified cladding region of the photonic crystal fiber, so that the Bragg grating can be formed. With the method adopted, the problem of low grating processing efficiency of a photonic crystal fiber caused by strong scattering of side surface processing laser caused by cladding holes when the Bragg grating is prepared on the photonic crystal fiber can be solved.