Radiation-Balanced Silica Fiber Amplifier

Knall, Jennifer M.Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA. (författare)

We report what we believe to be the first radiation-balanced fiber amplifier-a device that provides optical gain while experiencing no temperature rise. The gain medium is a silica fiber with a 21-mu m-diameter core highly doped with Yb3+ (2.52 wt. %) and codoped with 2.00 wt. % Al to reduce concentration quenching. The amplifier is core pumped with 1040-nm light to create anti-Stokes fluorescence cooling and gain in the core at 1064 nm. Using a custom slow-light fiber Bragg grating sensor with mK resolution, temperature measurements are performed at multiple locations along the amplifier fiber. A 4.35-m fiber pumped with 2.62 W produced 17 dB of gain, while the average fiber temperature remained slightly below room temperature. This advancement is a fundamental step toward the creation of ultrastable lasers necessary to many applications, especially low-noise sensing and high-precision metrology.

Engholm, MagnusMittuniversitetet,Institutionen för elektronikkonstruktion(Swepub:miun)mageng (författare)
Boilard, TommyUniv Laval, Ctr Opt Photon & Laser COPL, Quebec City, PQ G1V 0A6, Canada. (författare)
Bernier, MartinUniv Laval, Ctr Opt Photon & Laser COPL, Quebec City, PQ G1V 0A6, Canada. (författare)
Digonnet, Michel J. F.Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA. (författare)
Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA.Institutionen för elektronikkonstruktion (creator_code:org_t)

Av författaren/redakt...: Knall, Jennifer ...; Engholm, Magnus; Boilard, Tommy; Bernier, Martin; Digonnet, Michel ...

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