High-efficiency radiation-balanced Yb-doped silica fiber laser with 200-mW output

Balliu, Enkeleda,PhD studentMittuniversitetet,Institutionen för ingenjörsvetenskap, matematik och ämnesdidaktik (2023-),Stanford University, Stanford, US (författare)

The focus of this study was the development of a second generation of fiber lasers internally cooled by anti-Stokes fluorescence. The laser consisted of a length of a single-mode fiber spliced to fiber Bragg gratings to form the optical resonator. The fiber was single-moded at the pump (1040 nm) and signal (1064 nm) wavelengths. Its core was heavily doped with Yb, in the initial form of CaF2 nanoparticles, and co-doped with Al to reduce quenching and improve the cooling efficiency. After optimizing the fiber length (4.1 m) and output-coupler reflectivity (3.3%), the fiber laser exhibited a threshold of 160 mW, an optical efficiency of 56.8%, and a radiation-balanced output power (no net heat generation) of 192 mW. On all three metrics, this performance is significantly better than the only previously reported radiation-balanced fiber laser, which is even more meaningful given that the small size of the single-mode fiber core (7.8-µm diameter). At the maximum output power (∼2 W), the average fiber temperature was still barely above room temperature (428 mK). This work demonstrates that with anti-Stokes pumping, it is possible to induce significant gain and energy storage in a small-core Yb-doped fiber while keeping the fiber cool.

Meehan, B. (författare)
Cahoon, M. A. (författare)
Hawkins, T. W. (författare)
Ballato, J. (författare)
Dragic, P. D. (författare)
Boilard, T. (författare)
Talbot, L. (författare)
Bernier, M. (författare)
Digonnet, M. J. F. (författare)
MittuniversitetetInstitutionen för ingenjörsvetenskap, matematik och ämnesdidaktik (2023-) (creator_code:org_t)

Ingår i:Optics Letters: Optica Publishing Group49:8, s. 2021-20240146-95921539-4794

Av författaren/redakt...: Balliu, Enkeleda ...; Meehan, B.; Cahoon, M. A.; Hawkins, T. W.; Ballato, J.; Dragic, P. D.; visa fler...; Boilard, T.; Talbot, L.; Bernier, M.; Digonnet, M. J. ...; visa färre...

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