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Highly Yb-doped KGd(WO4)2 Thin-film Amplifier

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We report record-high small-signal gain of 1050 dB/cm at 981 nm wavelength in a KGd0.425Yb0.575(WO4)2 thin film. The sensitivity of gain to the shift of beam-focus position, which is critical under non-waveguiding conditions, is investigated.

© 2015 Optical Society of America

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