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EMG-150 MSC Lambda-Physik KrF excimer laser (a) delivers pulses at which pass through a homogenizer (b) and an aperture (c). After a few reflections the beam reaches the cylindrical lens (d) where it is focused after the phase mask (e). The fiber (f) is placed in contact to the phase mask. Light emitted by a broadband white-light source (g) is launched into the fiber (f), is reflected by the grating, and after going through a coupler (h) is collected by an HP70950 optical spectrum analyzer (g).
Example of reflection spectra of gratings written in samples of fiber C.
UV absorption spectra of samples A (Ge-doped silicate), C, and F (Sn-doped silicate).
Composition, NA, and cut-off wavelength of the fibers thermally treated.
Photosensitivity in fiber samples treated with a thermal cycle in a furnace at and pristine. , , and represent the grating length and in treated and untreated fibers, respectively. .
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