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Optical Gain in Capillary Light Guides Filled with NaYF4: Yb3+, Er3+ Nanocolloids

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Journal Article - Open Access

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Oakwood University Huntsville United States

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A capillary light guide optical amplifier using nanocolloids of Yb3-Er3 co-doped NaYF4 as a filler was successfully demonstrated. A 7-cm-long and 150-micron-inner-diameter capillary light guide was capable to amplify a pulsed optical signal at 1550 nm with a gain coefficient of 0.15 cm1 at a pump power of 4 mW 980-nm wavelength. The nanocolloid gain medium was prepared by pulverizing the phosphor powder with a high-speed planetary ball mill. Ball milling of the powder in water produced nanoparticles with a size of approximately 130 nm that after drying were transferred to a liquid with high refractive index 1.551 at 1550 nm required to maintain light confinement within the fused silica capillary light guide. The results show that RE-doped colloids of nanocrystals can be potentially used as liquid gain media fillers in capillary light guide lasers and amplifiers with high photostability and low toxicity.

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  • Fiber Optics and Integrated Optics

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