7 May 2012 Mode-converters for rectangular-core fiber amplifiers to achieve diffraction-limited power scaling
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Abstract
A rectangular-core fiber that guides and amplifies a higher-order-mode can potentially scale to much higher average powers than what is possible in traditional circular core large-mode-area fibers. Such an amplifier would require mode-conversion at the input and output to enable interfacing with TEM00 mode seed sources and generate diffraction-limited radiation for various applications. We discuss the simulation and experimental results of a mode conversion technique that uses two diffractive-optic-elements in conjugate Fourier planes to convert a diffraction limited TEM00 mode to the higher-order-mode of a ribbon core fiber. Our experiments show that the mode-conversion-efficiency exceeds 84% and can theoretically approach 100%.
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Arun Kumar Sridharan, Arun Kumar Sridharan, Paul H. Pax, Paul H. Pax, John E. Heebner, John E. Heebner, Derrek R. Drachenberg, Derrek R. Drachenberg, Jay W. Dawson, Jay W. Dawson, } "Mode-converters for rectangular-core fiber amplifiers to achieve diffraction-limited power scaling", Proc. SPIE 8381, Laser Technology for Defense and Security VIII, 838103 (7 May 2012); doi: 10.1117/12.920769; https://doi.org/10.1117/12.920769
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