Yb-doped large mode area fiber for beam quality improvement using local adiabatic tapers with reduced dopant diffusion
| Autor: | Yuan Zhu, Claudia Aichele, Martin Leich, Hartmut Bartelt, Jens Kobelke, Martin Lorenz, Matthias Jäger, Tina Eschrich |
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| Rok vydání: | 2018 |
| Předmět: |
Diffraction
Materials science Dopant business.industry Amplifier fiber fabrication Tapering 02 engineering and technology Nanosecond 021001 nanoscience & nanotechnology Cladding (fiber optics) 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Optics 0103 physical sciences Laser beam quality 0210 nano-technology Adiabatic process business fiber materials laser amplifiers |
| Zdroj: | Optics Express. 26:17034 |
| ISSN: | 1094-4087 |
| Popis: | A newly designed all-solid step-index Yb-doped aluminosilicate large mode area fiber for achieving high peak power at near diffraction limited beam quality with local adiabatic tapering is presented. The 45��m diameter fiber core and pump cladding consist of active/passively doped aluminosilicate glass produced by powder sinter technology (REPUSIL). A deliberate combination of innovative cladding and core materials was aspired to achieve low processing temperature reducing dopant diffusion during fiber fabrication, tapering and splicing. By developing a short adiabatic taper, robust seed coupling is achieved by using this Yb-doped LMA fiber as final stage of a nanosecond fiber Master Oscillator Power Amplifier (MOPA) system while maintaining near diffraction limited beam quality by preferential excitation of the fundamental mode. After application of a fiber-based endcap, the peak power could be scaled up to 375 kW with high beam quality and a measured M2 value of 1.3~1.7.A newly designed all-solid step-index Yb-doped aluminosilicate large mode area fiber for achieving high peak power at near diffraction limited beam quality with local adiabatic tapering is presented. The 45��m diameter fiber core and pump cladding consist of active/passively doped aluminosilicate glass produced by powder sinter technology (REPUSIL). A deliberate combination of innovative cladding and core materials was aspired to achieve low processing temperature reducing dopant diffusion during fiber fabrication, tapering and splicing. By developing a short adiabatic taper, robust seed coupling is achieved by using this Yb-doped LMA fiber as final stage of a nanosecond fiber Master Oscillator Power Amplifier (MOPA) system while maintaining near diffraction limited beam quality by preferential excitation of the fundamental mode. After application of a fiber-based endcap, the peak power could be scaled up to 375 kW with high beam quality and a measured M2 value of 1.3~1.7. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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