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We change the pitch of interferometrically written 1-dimensional periodic structures by adjusting the frequency shift between two interfering beams. This technique is applicable to fabrication of both planar and fiber Bragg gratings.
Long-range periodic nanoplane gratings written inside fused silica using a focused femtosecond laser beam can be erased and replaced with new gratings whose orientation is determined by the polarization of the femtosecond laser overwrite beam.
Diffraction gratings (1D and 2D) were recorded with femtosecond laser pulses in KDP samples. The resulting device behaves as an integrated frequency-doubling beam splitter when irradiated with intense laser radiation.
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