Bragg selectors of transversal modes for high power lasers

Award Information
Agency: Department of Defense
Branch: Missile Defense Agency
Contract: N00178-04-C-3104
Agency Tracking Number: B2-0807
Amount: $0.00
Phase: Phase I
Program: STTR
Awards Year: 2004
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
4028 Laurel Branch Ln,, Orlando, FL, 32817
DUNS: 120669085
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Vadim Smirnov
 Director in Holography
 (407) 617-2869
Business Contact
 Leonid Glebov
Title: Chief Technology Officer
Phone: (407) 823-6983
Research Institution
 SoO/CREOL at University of Central
 Mary Stanley
 4000 Central Florida Blvd., P.O. Box 162700
Orlando, FL, 32816
 (407) 823-2836
 Nonprofit college or university
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 transverse modes for pulsed neodymium laser. Dramatic narrowing of angular divergence of Nd:YAG laser was shown. Recently, UCF/CREOL demonstrated emission with diffraction limited divergence from a wide stripe semiconductor laser with PTR VBG as output coupler. Those results enable achieving of low divergence for high power solid state, fiber, and semiconductor lasers. A correlation between induced absorption, scattering, and refraction will be studied, and a technology of transmitting PTR Bragg gratings will be optimized for transversal mode selection. Interrelationships between angular and spectral selectivity of volume Bragg grating (VBG) and parameters of laser resonators will be studied and optimal design for high power, low divergence operation will be determined. PTR VBGs with absolute diffraction efficiency exceeding 97% withstanding 100 kW/cm2 CW laser radiation, and 30 J/cm2 of 10 ns pulsed radiation in near IR spectral region will be demonstrated for intracavity applications.100-Watt-class lasers with sub-nanometer spectral width and diffraction limited divergence will be demonstrated.

* Information listed above is at the time of submission. *

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