University of Central Florida Research Foundation Inc

Optigrate Corporation

Larissa Glebova

Leonid B Glebov

Vadim Smirnov

Julien Lumeau

Almantas Galvanauskas

Oleg Efimov

Eugeniu Rotari

Boris Zeldovich

Sergiy Mokhov

Leo A Siiman

Oleksiy Andrusyak

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

A novel process is proposed for the volume diffractive element (Bragg grating) fabrication in photosensitive silicate glasses doped with silver, cerium, fluorine, and bromine. The process employs a photo-thermo-refractive (PTR) glass of high purity exposed to ultraviolet (UV) radiation of a He&mdash;Cd laser at 325 nm followed by thermal development at temperatures from 480&deg; C. to 580&deg; C., preferably at 520&deg; C., from several minutes to several hours. Absolute diffraction efficiency up to 95% was observed for 1 mm thick gratings. Maximum spatial frequency recorded in PTR glass was about of 10,000 mm . No decreasing of diffraction efficiency were detected at low spatial frequencies. Original glasses were transparent (absorption coefficient less than 1 cm ) from 350 to 4100 nm. Induced losses in exposed and developed glass decreased from 0.3 to 0.03 cm between 400 and 700 nm, respectively, and did not exceed 0.01-0.02 cm in the infrared (IR) region from 700 to 2500 nm.

Process for production of high efficiency volume diffractive elements in photo-thermo-refractive glass

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Orlando, FL, United States of America

Larissa Glebova