High Power, High Efficiency Diode Sources for Pumping Eye-Safe Solid State Lasers

Award Information
Agency: Department of Defense
Branch: Army
Contract: W911NF-04-C-0137
Agency Tracking Number: A032-1902
Amount: $1,229,680.00
Phase: Phase II
Program: SBIR
Awards Year: 2004
Solicitation Year: 2003
Solicitation Topic Code: A03-057
Solicitation Number: 2003.2
Small Business Information
NLIGHT PHOTONICS
5408 NE 88th Street, Bldg E, Vancouver, WA, 98665
DUNS: 799811646
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Zack Huang
 Principal Investigator
 (360) 566-4466
 jason.farmer@nlight.net
Business Contact
 Jason Farmer
Title: VP Advanced Technology
Phone: (360) 566-4476
Email: jason.farmer@nlight.net
Research Institution
N/A
Abstract
High power eyesafe lasers are crucial for many military and industrial applications. Erbium doped lasers offer the potential for direct laser operation at 1.5 microns thereby reducing the size and cost and improving the efficiency of today' frequency converted one-micron lasers. Diode pumped Erbium lasers are typically pumped at 980-nm. The large quantum defect between the lasing wavelength and the pump wavelength leaves roughly 30% of the deposited energy as heat. For example, a 1-kW Erbium laser would require at least 500 Watts of heat to be removed. This amount of heat not only effects laser performance, it also requires a large thermal management system that adds size, weight, and cost to the system. A similar laser that was pumped at 1470-nm would require a factor of ten less heat to be removed. Unfortunately, today's high power InP diode lasers operating at 1470-nm produce less power and are less efficient 980-nm laser diodes. This is primarily a result of a dramatically lower differential quantum efficiency that results from both lower injection efficiency and higher optical losses. By improving the injection efficiency we propose to improve the efficiency of high power 1470-nm InP based laser diodes to over 40%.

* information listed above is at the time of submission.

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