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

Y. J. Zhang | Zendy; G. D. Zhang | Zendy; Cixiang Chen | Zendy; Razvan Stoian | Zendy; Guanghua Cheng | Zendy

Open Access

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

Author(s) -

Y. J. Zhang,

G. D. Zhang,

Cixiang Chen,

Razvan Stoian,

Guanghua Cheng

Publication year - 2016

Publication title -

optical materials express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.925

H-Index - 66

ISSN - 2159-3930

DOI - 10.1364/ome.6.003491

Subject(s) - materials science , femtosecond , optics , diffraction efficiency , laser , grating , refractive index , holography , diffraction grating , diffraction , phase (matter) , optoelectronics , photorefractive effect , wavelength , physics , chemistry , organic chemistry

International audienceTransmission 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 power 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 μ

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