Abstract

In this Letter, we proposed a new technique for point-by-point fiber Bragg grating (FBG) writing in a static fiber by using a spatial light modulator to control the position of the focal point inside the fiber core. Various types of short-length FBGs (uniform, phase-shifted, and apodized) were demonstrated by this inscription technique. Moreover, the capability to tailor the transverse dimension of a grating pitch from a single point to more complex shapes, such as a wide plane covering a whole fiber core or a transverse ring, was shown.

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Femtosecond laser line-by-line inscription of apodized fiber Bragg gratings

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Point-by-point inscription of apodized fiber Bragg gratings

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Direct femtosecond laser inscription of an IR fluorotellurite fiber Bragg grating

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