University of Central Florida Research Foundation, Inc.

Optigrate Corporation

Julien Lumeau

Leonid B Glebov

Vadim Smirnov

Boris Zeldovich

Larissa Glebova

Sergiy Mokhov

Almantas Galvanauskas

Eugeniu Rotari

Leo A Siiman

Oleksiy Andrusyak

Complex spectral and angular diffractive optical elements in photosensitive materials based on Moir&#xe9; pattern are proposed and demonstrated. The process is based on the recording of multiple volume Bragg gratings with controlled difference of the periods in the same volume of photosensitive material. Filters with ultra-narrow bandpass in the range of a few picometers to a few tens of picometers or apodized diffractive optical elements across large aperture are demonstrated. Several methods to fabricating such Moir&#xe9; Bragg gratings are proposed. Experimental demonstration of a Moir&#xe9; ultra-narrowband diffractive optical element in PTR glass is performed.

Volume Moir&#xe9; Bragg gratings in a photosensitive material

Recent invention of longitudinally chirped volume Bragg gratings has dramatically changed a design of high power femtosecond lasers. Replacing of bulky pairs of conventional surface gratings with compact and robust chirped volume Bragg gratings for stretching and compression of laser pulses in chirped-pulse-amplification systems enabled decrease of size and weight of those systems by several times. The methods and devices enable substantial increase of stretching time and compression to shorter pulses, enhancement of stretched and compressed beams quality by stationary or dynamic shaping of gratings, and shaping of laser pulses in both temporal and spectral domains.

Laser pulse temporal, spectral and spatial shaping devices based on volume diffractive gratings with spatially variable parameters

Apparatus, methods and systems for production of high efficiency refractive and diffractive elements by providing a photo-sensitizer free multicomponent glass, exposing the multi component glass to pulsed laser radiation to produce refractive indexed modulation, and heating the exposed multicomponent silicate glass to produce the high efficiency refractive and diffractive elements. The pulsed laser radiation is infrared femtosecond pulses to ultraviolet nanosecond pulses which provide ionization of glass matrix. The multicomponent glass is a photosensitive glass with high transparency in ultraviolet spectral region, e.g. silicate glass which includes silver, fluorine and bromine and does not contain photosensitizers such as cerium and antimony, PTR glass, cerium free PTR glass and cerium+antimony free PTR glass.

Production of high efficiency diffractive and refractive optical elements in multicomponent glass by nonlinear photo-ionization followed by thermal development

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Oviedo, FL, United States of America

Julien Lumeau