High-power fiber amplifier using a PM Yb-doped photodarkening-resistant LMA fiber with depressed-clad index profile design

Mathieu Drolet; Claude Paré; Huimin Zheng; Pierre Laperle; Antoine Proulx; Yves Taillon

doi:10.1117/12.842583

17 February 2010 High-power fiber amplifier using a PM Yb-doped photodarkening-resistant LMA fiber with depressed-clad index profile design

Mathieu Drolet, Claude Paré, Huimin Zheng, Pierre Laperle, Antoine Proulx, Yves Taillon

Author Affiliations +

Proceedings Volume 7580, Fiber Lasers VII: Technology, Systems, and Applications; 75802M (2010) https://doi.org/10.1117/12.842583
Event: SPIE LASE, 2010, San Francisco, California, United States

Abstract

Based on a depressed-clad index profile design, a PM Yb-doped large mode area (LMA) fiber with an effective mode area of 450 μm² was designed and fabricated. The fiber was used to amplify 10-ns pulses at 1064 nm with a repetition rate of 100 kHz, and an output energy higher than 200 μJ was obtained, within a bandwidth of 0.5 nm. The fiber was coiled on a 12-cm diameter mandrel to obtain a single-mode output having a measured M² value of 1.04. The output polarization extinction ratio was higher than 20 dB. The photodarkening excess loss of the Ytterbium//Phosphorus Aluminum co-doped fiber was measured to be a factor 5 lower than that of a reference Ytterbium/Aluminum co-doped fiber. It is shown how a depressed-clad index profile design can improve higher-order mode filtering while keeping the coiling diameter practical for compact fiber amplifier packaging.

Citation Download Citation

Mathieu Drolet, Claude Paré, Huimin Zheng, Pierre Laperle, Antoine Proulx, and Yves Taillon "High-power fiber amplifier using a PM Yb-doped photodarkening-resistant LMA fiber with depressed-clad index profile design", Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 75802M (17 February 2010); https://doi.org/10.1117/12.842583

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