High-power tandem-pumped fiber amplifier with beam quality maintenance enabled by the confined-doped fiber.
Opt Express
; 29(20): 31337-31347, 2021 Sep 27.
Article
en En
| MEDLINE
| ID: mdl-34615228
The high absorption confined-doped ytterbium fiber with 40/250 µm core/inner-cladding diameter is proposed and fabricated, where the relative doping ratio of 0.75 is selected according to the simulation analysis. By employing this fiber in a tandem-pumped fiber amplifier, an output power of 6.2 kW with an optical-to-optical efficiency of â¼82.22% is realized. Benefiting from the large-mode-area confined-doped fiber design, the beam quality of the output laser is well maintained during the power scaling process with the beam quality factor of â¼1.7 of the seed laser to â¼ 1.89 at the output power of 5.07 kW, and the signal-to-noise ratio of the output spectrum reaches â¼40 dB under the maximum output power. In the fiber amplifier based on the 40/250 µm fully-doped ytterbium fiber, the beam quality factor constantly degrades with the increasing output power, reaching 2.56 at 2.45 kW. Moreover, the transverse mode instability threshold of the confined-doped fiber amplifier is â¼4.74 kW, which is improved by â¼170% compared with its fully-doped fiber amplifier counterpart.
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01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Opt Express
Asunto de la revista:
OFTALMOLOGIA
Año:
2021
Tipo del documento:
Article
Pais de publicación:
Estados Unidos