"The overall objective of the proposal is to develop the technology of production of robust filters with adjustable transmittance based on the phase Bragg gratings in photo-thermo-refractive (PTR) glass. This glass is a very promising photosensitive mediumfor volume holograms because it has… More

In Phase I, LPTI proved f the concept of high efficiency narrow-band mirror in photo-thermo-refractive glass (PTRG) for high power Nd:YAG laser. In Phase II, a number of photo-thermo-refractive diffractive optical elements (PTR HOEs) including both reflecting and transmitting volume gratings, will… More

The objective of this proposal is to demonstrate the novel type of mode selection for high power lasers for target tracking and interception. In Phase I, LPTI proved the concept of volume Bragg gratings (VBGs), which were recorded in photo-thermo-refractive (PTR) glass, as effective selectors of… More

The purpose of this NASA SBIR Phase I proposal is to develop a novel type of high resolving power diffraction gratings based on volume Bragg gratings technology. The key innovation to be used for creation of these gratings is the patented technology on production of high efficiency volume… More

One of the most efficient ways to create narrow band filter is the use of reflective Bragg gratings or which allow increasing of efficiency and decreasing of weight compare to conventional technologies. OptiGrate have proved the concept of high efficiency narrow-band mirrors in… More

The purpose of this NASA SBIR Phase I proposal is to develop the prototype of a compact single-frequency mode ? one longitudinal and one transverse mode ? laser oscillator (SFM) using a pulse pumped Er-doped multimode fiber as an active element inserted in the external cavity. The main feature of… More

The main purpose of this NASA SBIR Phase II proposal is development of a novel type of high resolving power diffraction gratings based on volume Bragg gratings technology. The key innovation, which was used for creation of these gratings, is based on patented technology of production of high… More

A compact stretcher/compressor for high power ultra short fiber laser system with chirped pulse amplification is proposed on the basis of longitudinally chirped volume Bragg gratings in photo-thermo-refractive (PTR) glass. Efficiency of compression will exceed 80% for average power scaling to the… More

This proposal is based on successful results of Phase I project where it was shown that the use of volume Bragg gratings in PTR glass as selectors of transverse and longitudinal modes in external resonators of fiber lasers resulted in single-frequency oscillation. Technology of low-loss thick volume… More

Theoretical and experimental study of coherent combining of the beams of fiber lasers is proposed. The key element of the proposed scheme is the use of new corner geometry of Volume Bragg Gratings (VBG) for mixing of the field amplitudes of individual lasers and for the coherent feedback. The… More

The objective of this proposal is to develop the robust technology of a stretcher and a compressor for ultra short laser pulses. In Phase I OptiGrate demonstrated high quality stretching and compression by chirped Bragg gratings (CBG) fabricated in photo-thermo-refractive (PTR) glass. Significant… More

Development of airborne and spaceborne laser systems dictates a number of extremely challenging requirements for such fine optical devices. These requirements include minimizing weight and volume, increasing of power and brightness, high tolerance to mechanical and acoustic vibrations and ionizing… More

Beam combining is considered as the most promising approach for creation of high power 100 kW-class portable electric lasers. Passive coherent beam combining is based on mixing of output fields of a multichannel laser device, selection of proper combination of transverse and longitudinal modes for… More

The main goal of the project is to demonstrate the feasibility of a monolithic solid state laser on the basis of PTR glass co-doped with luminescent rare earth ions. The main feature of this new complex material is its ability to be simultaneously an active laser medium and a phase photosensitive… More

The proposed innovation is based on a combination of two new technologies developed at the Center for Laser Technology at the Fraunhofer Institute and OptiGrate Corp. and aims to integrate advanced packaging of single emitter laser diodes, spectral and angular narrowing of these diodes by volume… More

The general objective of this proposal is to design a self-stabilized monolithic single frequency solid state laser. The main advantage of the approach is based on the integration of a laser cavity within active laser material - Nd-doped photo-thermo-refractive (PTR) glass, which allows constructing… More

The overall goal of the proposed project is to develop a Volume Bragg Grating (VBG) controlled surface emitting laser for pumping of low pressure Rb vapor laser. This approach will provide dramatic decrease of specific volume of a pumping lase system and, therefore, will dramatically decrease the… More

ABSTRACT: The objective of the proposed research is to develop a new type of volume holographic elements that can operate in mid IR spectral region. To achieve this goal, research will be directed to a photo-thermo-refractive (PTR) glass which provides a photo-thermo-induced refractive index change… More

The objective of this proposal is to extend the technology of chirped pulse amplification in ultrashort pulse lasers based on chirped volume Bragg gratings (CBGs) to higher stretching/ compression ratio and make the device more robust. In Phase I OptiGrate demonstrated high quality stretching and… More