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7 March 2019 Narrow-linewidth all-solid large-mode-area photonic crystal fiber amplifier
Jakob M. Hauge, Sidsel R. Papior, Jens E. Pedersen, Simon L. Christensen, Magalie Bondu, Thomas T. Alkeskjold, Jesper Lægsgaard
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Proceedings Volume 10897, Fiber Lasers XVI: Technology and Systems; 1089728 (2019) https://doi.org/10.1117/12.2506246
Event: SPIE LASE, 2019, San Francisco, California, United States
Abstract
Large-mode-area (LMA) photonic crystal fiber (PCF) amplifiers are attractive for high-power amplification of single-mode (SM) narrow-linewidth light. Traditionally, LMA PCF designs include air holes but splicing and interfacing of fibers with air holes is complicated. Recently, this was addressed with the development of a LMA PCF amplifier fiber without air holes but with SM operation maintained. This all-solid fiber can be spliced with standard splicers and thus enables integration of PCFs into all-fiber monolithic laser systems. The new fiber, named DC-250/30-PM-Yb-FUD, is demonstrated in a free-space configuration for high-power amplification of 1064 nm light with a narrow linewidth of less than 20 kHz. A seed power of 380 mW is amplified to 40 W, corresponding to a single-stage gain of 20 dB, with an optical to optical efficiency of 69%. No indication of stimulated Brillouin scattering is observed, and the output is stable during frequency modulation of the seed laser.
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Jakob M. Hauge, Sidsel R. Papior, Jens E. Pedersen, Simon L. Christensen, Magalie Bondu, Thomas T. Alkeskjold, and Jesper Lægsgaard "Narrow-linewidth all-solid large-mode-area photonic crystal fiber amplifier", Proc. SPIE 10897, Fiber Lasers XVI: Technology and Systems, 1089728 (7 March 2019); https://doi.org/10.1117/12.2506246
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KEYWORDS
Optical fibers
Optical amplifiers
Photonic crystal fibers
Fiber amplifiers
Amplifiers
Frequency modulation
High power fiber amplifiers
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