Vytran Demonstrates Over 100W from Coherently Combined All-Fiber Passive Laser Arrays

Results Conclude SBIR Phase II Contract with Air Force Research Laboratory

February 10, 2010
Morganville, New Jersey, February 10, 2010 –- Vytran, an innovative supplier of fiber fusion splicing, assembly and fiber-based glass processing solutions, has coherently combined two, three, and four fiber lasers to produce over 100 watts of single transverse mode output at around one micron from an all-fiber, all-passive configuration. These results conclude a two year Small Business Innovation Research (SBIR) Phase II contract for the Air Force Research Laboratory (AFRL) Directed Energy Directorate at Kirtland Air Force Base (Albuquerque, New Mexico).

“We have achieved record power levels of over 100 watts from self-organized beams in two-, three- and four-laser combinations by using large mode area (LMA) 2x2 couplers in all-fiber and all-passive configuration,” said Dr. Baishi Wang, Vytran director of technology. “In addition, we reached 210 watts by combining four lasers using a LMA 7:1 fiber coupler. This work paves the way for further coherent power scaling to kW level and beyond by combining multiple lasers.”

Coherent beam combining (CBC) is a technique that combines multiple laser emitters, in this case fiber lasers, into a single, higher power, brighter, high-quality beam. This latest demonstration not only advances the output power for all-fiber, all-passive laser beam combination, but it also provides scientists with a better understanding of the underlying mechanisms of self-organized beam combination, especially the role of fiber nonlinearity.

“This demonstration has significantly advanced coherent combined output power compared with previous fiber laser-based CBC attempts and we attribute the results in part to the precision fused fiber components employed in the system,” said Jean-Michel Pelaprat, Vytran president and CEO. “All of these components were produced with our GPX-3400 glass processor, a unique filament fusion system that is routinely used to manufacture the splices, couplers and combiners critical in high-power fiber lasers.”

Applications for high-power fiber lasers include industrial uses such as metal cutting and welding and material surface treatment along with other applications that require high-power, high-brightness laser output.
Vytran was the primary contractor for the SBIR Phase II grant. Key collaborators also included scientists and engineers at Hughes Research Laboratories in Malibu, California, and Crystal Fibre (NKT Photonics) in Birkerød, Denmark. “We also thank Anthony Sanchez and his team at AFRL with whom we worked closely on this project,” said Pelaprat.
About Vytran
Vytran is an innovative supplier of semi-automated and fully automated fiber fusion splicing and glass processing solutions for the telecom, fiber laser, sensing, medical, aerospace, and specialty fiber products markets. Vytran technologies are designed to reduce customers’ risk, speed their products to market, and lower their cost of ownership. The company’s patented filament fusion technology is paired with industry-leading machine monitoring and control capabilities to provide process control unattainable with other fusion splicing methods. These technologies, along with innovations in fiber cleaving, recoating and proof testing, make Vytran a leader in reliable, precision equipment for high-volume optical fiber assembly and specialty fiber processing. Vytran is part of the NKT Photonics Group.
For more information about Vytran, LLC, please visit http://www.vytran.com or email .(JavaScript must be enabled to view this email address).

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Jean-Michel Pelaprat
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Vytran, LLC
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