Power scaling of rare-earth-doped fiber sources

Dahv A. V. Kliner; Jeffrey P. Koplow

doi:10.1117/12.580044

12 January 2005 Power scaling of rare-earth-doped fiber sources

Dahv A. V. Kliner, Jeffrey P. Koplow

Proceedings Volume 5653, Lidar Remote Sensing for Industry and Environmental Monitoring V; (2005) https://doi.org/10.1117/12.580044
Event: Fourth International Asia-Pacific Environmental Remote Sensing Symposium 2004: Remote Sensing of the Atmosphere, Ocean, Environment, and Space, 2004, Honolulu, Hawai'i, United States

Abstract

Single-mode (SM) fiber lasers and amplifiers are constrained to low output powers by fundamental physical limitations of the fiber, specifically, by low energy storage and by the onset of nonlinear processes in the fiber. The simplest way to overcome both limiting factors is to increase the core size, but maintaining SM operation imposes an upper limit. Further power scaling is possible with multimode (MM) fiber, but the poor beam quality generally associated MM fiber is unacceptable for many applications. We have developed a technique (bend-loss-induced mode filtering) that allows the core size to be increased significantly beyond the SM limit while maintaining diffraction-limited beam quality and high efficiency. In this method, coiling of the fiber is used as a form of distributed spatial filtering to suppress all but the fundamental mode of a highly MM fiber amplifier. Unlike conventional spatial filtering, in which high-order modes are discarded, the mode-filtering technique does not result is substantial loss of efficiency because high-order modes are suppressed along the entire length of the amplifier and are thus prevented from building up significant intensity. We will review this method and recent experimental results for both cw and pulsed fiber sources, including nonlinear frequency conversion of mode-filtered fiber lasers. Optical damage issues will also be discussed.

Citation Download Citation

Dahv A. V. Kliner and Jeffrey P. Koplow "Power scaling of rare-earth-doped fiber sources", Proc. SPIE 5653, Lidar Remote Sensing for Industry and Environmental Monitoring V, (12 January 2005); https://doi.org/10.1117/12.580044

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