Accession Number : AD1004058


Title :   Power-Scalable Blue-Green Bessel Beams


Descriptive Note : Technical Report,01 Jan 2011,31 Dec 2013


Corporate Author : Boston University Boston United States


Personal Author(s) : Ramachandran,Siddharth


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1004058.pdf


Report Date : 23 Feb 2016


Pagination or Media Count : 13


Abstract : 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.


Descriptors :   NONLINEAR OPTICS , high energy lasers , LONG WAVELENGTHS , SPECTRAL EMITTANCE , fiber optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE