Optical Cooling of RF systems

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-11-C-0477
Agency Tracking Number: N10A-017-0330
Amount: $742,821.00
Phase: Phase II
Program: STTR
Awards Year: 2011
Solicitation Year: 2010
Solicitation Topic Code: N10A-T017
Solicitation Number: 2010.A
Small Business Information
NP Photonics, Inc.
UA Science and Technology Park, 9030 S. Rita Road, Suite #120, Tucson, AZ, -
DUNS: 014750785
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Dan Nguyen
 Optical Modeling Engineer
 (520) 799-7419
 ntdan@npphotonics.com
Business Contact
 James Fountain
Title: Director, Contract Admini
Phone: (520) 799-7424
Email: fountain@npphotonics.com
Research Institution
 University of Arizona
 Sherry L Esham
 Sponsored Projects Services
PO Box 3520
Tucson, AZ, 85722-3520
 (520) 626-6000
 Nonprofit college or university
Abstract
This Phase II Proposal is for the development of an all-fiber based approach to optical cooling for RF systems: a high power, high efficiency Tm+3-doped fiber laser (Lambda from 1.9 microns to ~ 2 microns) is used to pump Tm+3-doped glass fibers, which provide the cooling action on the affixed heat source. One of the main advantages of this approach is that the waste (heat) photons can in principle be piped substantial distances and expelled wherever the system designer wishes. The cooling fibers for Phase II have much less impurities and background losses compared to the glasses used in Phase I. These features of the new glasses will greatly reduce the parasitic heat in the cooling fiber. Fiber structures with multiple cores will be designed and fabricated to increase significantly both pump absorption and net cooling power. The broad wavelength operation of Tm-doped fiber lasers will be utilized for optimization of cooling processes such as pump wavelength dependence. Tm-doped fiber lasers with different lasing wavelengths will be built for that purpose. Optimization of losses in the system, in particular the scattering loss in the fiber system, will be investigated both experimentally and theoretically. Furthermore, multiple fibers/lasers will also be investigated to achieve maximum cooling power and cooling efficiency in the system.

* information listed above is at the time of submission.

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