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Embedded-mirror side pumping enables fabrication of compact, efficient fiber sources using a variety of pump sources. It is the only method capable of employing the output of an unformatted diode bar. We discuss recent progress.
We have demonstrated for the first time a cladding pumped C-band amplifier using high brightness in-band pump source at 1535 nm. Output power >10 W was obtained at 1565 nm with better than 40 dB OSNR.
Modal interference in few-moded large-core fiber amplifiers can yield output beams with good beam quality (M2~1.2 - 1.4) giving the impression of single-mode operation despite significant higher-order mode content. The implications for high-power devices are discussed.
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