Power-Scalable Blue-Green Bessel Beams
Technical Report,01 Jan 2011,31 Dec 2013
Boston University Boston United States
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The overall goal of this program was to demonstrate intermodal nonlinearities as a pathway for high-power all-fiber lasers at non-traditional emission wavelengths, and then to demonstrate a proof of concept of this methodology for achieving high-power blue-green tunabel lasers. The first part of the program, namely demonstrating that the use of Bessel beam like high order optical modes for nonlinear frequency translation, and hence emission, at non-standard wavelengths was highly successful, and cascaded emission down to 453 nm was achieved. We showed that a simple double-clad fiber suffices for all these demonstrations, thereby enabling significant cost reductions for future systems that employ this technique. We also showed that this technique is eminently scalable, and achieved tunable lasers in the 1um range with 10 kW of peak power. The second part of the program, namely specifically building system to achieve emission at the desired blue colours, was, however, abandoned due to lack of funds relative to the original anticipated award amount.