Fabrication of fiber Bragg gratings with 267 nm femtosecond radiation.

Inscription of fiber Bragg gratings by ultraviolet femtosecond radiation.

We report on what is to our knowledge the first fabrication of fiber Bragg gratings by UV femtosecond radiation. The Bragg gratings, with photoinduced refractive-index modulation up to 1.92 x 10(-3) in H2-loaded SMF-28 and up to 1.05 x 10(-3) in Nufern GF1 fibers, were written by high-intensity (31-77-GW/cm2) femtosecond pulses at 264 nm. The dependence of the refractive-index modulation on int...

Two Beam Interferometric Inscription of UV femtosecond Fiber Bragg Gratings

The inscription of fiber Bragg gratings with femtosecond laser radiation gives access to a wide range of new materials beyond conventional UV-photosensitive and special hydrogen loaded materials. We have therefore investigated the use of an interferometric technique in combination with UV femtosecond laser pulses to generate fiber Bragg gratings in different types of fibers. Additionally, the t...

A versatile machine optimized for the fabrication of Fiber Bragg Gratings (FBGs) by femtosecond laser direct-writing

Femtosecond-laser-inscribed sampled fiber Bragg grating with ultrahigh thermal stability.

We have successfully fabricated a series of sampled fiber Bragg gratings with easily adjustable sampling periods and duty cycles using an 800 nm femtosecond laser point-by-point inscription. The thermal stability of the fabricated fiber gratings was investigated using isochronal annealing tests, which indicated that the fiber gratings are capable of maintaining high reflectivity at temperatures...

Direct Fabrication of Planar Grating by Ultrafast Laser Beam

Femtosecond laser pulse has been used for the machining of the gratings primarily due to its superior advantages over conventional continuous wave (CW) and long pulse lasers for micromachining. In this paper, we develop a novel technique for the fabrication of planar gratings by colliding two beams to generate interference fringes. This technique is simple, fast and low cost. We have successful...