Commercial and Biomedical Applications of Ultrafast Lasers VIII
DOI: 10.1117/12.762707
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We present some of our results on the femtosecond laser direct writing and characterization of micro-gratings in Baccarat glass. Gratings were inscribed with amplified 800 nm, ~100 femtosecond pulses at 1 kHz repetition rate. The change in refractive index of the modified region was estimated from grating efficiency measurements and was found to be ~10 -3 . Micro-Raman studies demonstrated an increase in the intensity of the band near 596 cm -1 in the laser irradiated region clearly indicating an increase in the refractive index. Micro-Raman mapping of the grating showed a periodic variation of the band intensity further confirming the formation of grating. Structures with sub wavelength dimensions (