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Kilowatt Class Side-pumped Thulium Fiber Amplifier

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-20-C-0714
Agency Tracking Number: N201-044-0633
Amount: $140,000.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N201-044
Solicitation Number: 20.1
Solicitation Year: 2020
Award Year: 2020
Award Start Date (Proposal Award Date): 2020-07-14
Award End Date (Contract End Date): 2021-01-11
Small Business Information
135 South Road
Bedford, MA 01730-1111
United States
DUNS: 061931676
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Adam Card
 (781) 271-1858
Business Contact
 B. David Green
Phone: (978) 689-0003
Research Institution

Q-Peak proposes a high power Thulium (Tm) doped fiber amplifier design operating at 2 µm wavelength utilizing a novel lateral fiber fusion side-pumping method and a nanoparticle doping technique to generate significant signal power and performance.  The proposed fusion side-pumping method will distribute the pump power along the length of the active fiber, allowing the high power amplifier to yield a relatively uniform gain distribution and a distributed thermal load. The fusion side-pumping method, consisting of fusing a coreless passive fiber to a Tm-doped double clad fiber, will provide significant cross-coupling between the input pump power and the cladding of the active fiber. This high power amplifier model will avoid thermal loading issues seen experimentally in end-pumping high power Thulium fiber lasers.  Q-Peak’s high power amplifier design will utilize a fusion region between the two fibers long enough to be able to efficiently pump bi-directionally without damaging any pump diode lasers. Additionally, the proposed nanoparticle doping method, developed by NRL, will intentionally cluster Tm ions into intimate contact in order exploit the “two-for-one” cross-relaxation phenomena observed in Thulium ions in close proximity.  The location of the Tm ions will be effectively controlled, causing the cross-relaxation process to require less ions.  Therefore, there is less absorption and less thermal load on the active fiber.  Utilizing these two methods will allow for a novel amplifier prototype capable of signal power in excess of 1 kW without having significant thermal load issues in the active fiber.

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

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