Transmission volume phase holographic gratings in photo-thermo-refractive glass written with femtosecond laser Bessel beams

Abstract : Transmission volume phase holographic gratings were fabricated in bulk photo- thermo-refractive glass using zero-order femtosecond laser Bessel beams and subsequent thermal treatment. Microstructures composed of nano-sized crystals were observed in the exposed regions. The concentration of nano-crystals depended on the writing power, but the size of the nano-crystals was found to be quasi power-independent. Low writing power led to sparse nano-crystals, while optimized writing po wer achieved dense nano-crystals distribution and high refractive index change. Effects of the gratings thickness, writing laser power and thermal treatment on the diffraction efficiency were investigated. A maximum diffraction efficiency of 94.73% was achieved (at 532 nm testing wavelength) with 1 mm grating thickness at period of 5 μm
Keywords : laser fabrication
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Journal articles
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https://hal-ujm.archives-ouvertes.fr/ujm-01432521
Contributor : Razvan Stoian <>
Submitted on : Wednesday, January 11, 2017 - 5:17:58 PM
Last modification on : Thursday, July 25, 2019 - 4:30:04 PM

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Zhang Y. J., Zhang G. D., Chen C. L., Razvan Stoian, Guanghua Cheng. Transmission volume phase holographic gratings in photo-thermo-refractive glass written with femtosecond laser Bessel beams . Optical Materials Express, OSA pub, 2016, 6 (11), pp.3491. ⟨10.1364/OME.6.003491⟩. ⟨ujm-01432521⟩

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