Ultra Large Mode Area Fibers and Fiber Lasers

Dear Colleagues,

With the recent advances in high-power fiber laser techniques, and the consequent improvements in efficiency, beam quality, and thermal management, there has been a growing impact on optical science and engineering of ultra large mode area (ULMA) fibers. These fibers bring the issue of nonlinear effects under control with their large mode-field area, however their large core makes single-mode operation difficult to achieve, leading to a wide variety of approaches.

Some exploit higher-order mode delocalization to achieve high-performance active double-clad fiber structures, such as low-symmetry large-pitch fibers. Others manage the issues due to multi-mode propagation by selectively managing the loss of the fundamental mode with respect to the higher-order modes, such as leakage channel fibers. Some solve the technical limits of ULMA fibers through the study and fabrication of multi-core fibers. Further novel approaches are constantly being uncovered by investigation in a field that is presently at the leading edge of fiber optics research.

This Special Issue is dedicated to the most recent progress and emerging novel applications of ULMA fibers in optics and photonics, with a special emphasis on fiber laser applications, and to the associated advances in fabrication, measurement, and modeling techniques.

Dr. Lorenzo Rosa
Guest Editor

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• ULMA fiber lasers
• photonic-crystal fibers
• low-symmetry fibers
• chiral fibers
• leakage channel fibers
• pixelated fibers
• hollow core fibers
• multi-core fibers
• thermal effects
• materials and fabrication techniques
• novel characterization techniques
• modeling and simulation