Authors

M. L. Ng; D. Chanda;P. R. Herman

Comments

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Abbreviated Journal Title

Opt. Express

Keywords

TRANSPARENT MATERIALS; FORM BIREFRINGENCE; GRATINGS; FABRICATION; LASER; GLASS; EFFICIENCY; SILICA; Optics

Abstract

Diffractive optical elements serve an important function in many dynamic and static optical systems. Multilayered diffractive elements offer powerful opportunity to harness both phase and amplitude modulation for benefits in diffraction efficiency and beam shaping. However, multilayered combinations have been difficult to fabricate and provide only weak diffraction for phase gratings with low refractive index contrast. Femtosecond laser writing of finely-pitched multilayer volume gratings was optimized in bulk fused silica. We identify and quantify an optimum layer-to-layer separation according to Talbot self-imaging planes and present systematic experimental validation of this new approach to enhance otherwise weakly diffracting volume gratings.

Journal Title

Optics Express

Volume

20

Issue/Number

21

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

23960

Last Page

23970

WOS Identifier

WOS:000309955100102

ISSN

1094-4087

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