Laser Power Transmission Employing a Dual-Use Photovoltaic Concentrator at the Receiving End

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNM04AA80C
Agency Tracking Number: 033550
Amount: $69,078.00
Phase: Phase I
Program: SBIR
Awards Year: 2004
Solicitation Year: 2003
Solicitation Topic Code: F3.05
Solicitation Number: N/A
Small Business Information
ENTECH, Inc.
1077 Chisolm Trail, Keller, TX, 76248-7000
DUNS: 108935420
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Mark O'Neill
 Principal Investigator
 (817) 379-0100
 mjoneill@entechsolar.com
Business Contact
 Mark O'Neill
Title: President
Phone: (817) 379-0100
Email: mjoneill@entechsolar.com
Research Institution
N/A
Abstract
The proposed innovation is a wireless laser power transmission system employing a dual-use photovoltaic concentrator at the receiving end. Specifically, the laser receiver/converter employs thin Fresnel lenses to focus continuous or pulsed laser light onto small photovoltaic cells, thereby reducing cell cost and improving cell conversion efficiency (> 70% near term). The dual-use approach employs a novel four-terminal multijunction cell interconnection design to allow the same photovoltaic concentrator to be used as a state-of-the-art solar array. Specifically, the photovoltaic concentrator uses multijunction cells for the high-efficiency solar radiation conversion (> 30% near-term), but only the top junction of such cells for the high-efficiency laser radiation conversion. After system optimization in Phase I and system demonstration in Phase II, the new modular laser/solar photovoltaic concentrator will have many NASA, military, and commercial space applications. Applications include spacecraft arrays receiving laser input from other spacecraft or from Earth; lunar or planetary arrays receiving laser input from nearby spacecraft or from Earth; and Earth-based arrays receiving laser input from space solar power (SSP) spacecraft. The dual-use capability enables state-of-the-art solar power operation when sunlight is available (e.g., illuminated orbit portion), and laser operation when sunlight is not available (e.g., eclipse orbit portion).

* information listed above is at the time of submission.

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