Combined interferometric-mask method for creation of micro- and sub-micrometric scale 3D structures in photorefractive materials

Anahit Badalyan; Ruben Hovsepyan; Vahram Mekhitaryan; Paytsar Mantashyan; Rafael Drampyan

doi:10.1117/12.890933

4 March 2011 Combined interferometric-mask method for creation of micro- and sub-micrometric scale 3D structures in photorefractive materials

Anahit Badalyan, Ruben Hovsepyan, Vahram Mekhitaryan, Paytsar Mantashyan, Rafael Drampyan

Author Affiliations +

Proceedings Volume 7998, International Conference on Laser Physics 2010; 79980H (2011) https://doi.org/10.1117/12.890933
Event: International Conference on Laser Physics 2010, 2010, Ashtarak, Armenia

Abstract

A new combined interferometric-mask method is suggested and realized for creation of 3-dimensional (3D) holographic periodic and quasi-periodic structures in photorefractive materials. The method is based on the preparation of 2- dimensional (2D) micrometric scale masks with different symmetries and illumination of the photorefractive material through the mask by Gaussian beam in combination with back reflecting mirror. The counter-propagating beam geometry builds up Gaussian standing wave, which determines the third half-wave period of the grating in the axial direction. Thus, the created 3D intensity pattern can be represented as numerous mask-generated 2D quasi-periodic structures located in each anti-node of the standing wave. The formed intensity pattern can be imparted into the photorefractive medium via electro-optic effect, thus creating micro- and sub-micro scale 3D refractive index volume gratings with new symmetries and properties. The gratings were recorded by 532 nm cw laser beams in Fe-doped lithium niobate crystals taking into account their high photorefractive properties and possibility of creating the persistent gratings. The gratings formed have ~ 10 μm period in radial and azimuthal directions and ~266 nm in axial direction. The gratings were interrogated by diffraction of low intensity Gaussian probe beams from the recorded structures.

Citation Download Citation

Anahit Badalyan, Ruben Hovsepyan, Vahram Mekhitaryan, Paytsar Mantashyan, and Rafael Drampyan "Combined interferometric-mask method for creation of micro- and sub-micrometric scale 3D structures in photorefractive materials", Proc. SPIE 7998, International Conference on Laser Physics 2010, 79980H (4 March 2011); https://doi.org/10.1117/12.890933

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