19 May 2010 440 W polarized single-transverse-mode CW fiber amplifier with thin disk laser seed source
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Proceedings Volume 7721, Solid State Lasers and Amplifiers IV, and High-Power Lasers; 77210Q (2010); doi: 10.1117/12.854294
Event: SPIE Photonics Europe, 2010, Brussels, Belgium
Abstract
Diode-pumped master oscillator fiber amplifiers (MOFA) are known as very flexible laser sources since their spectral, temporal and polarization properties are mainly determined by the seed source which can be controlled quite easily at comparatively low powers. Additionally, they exhibit several of the typical advantages of fiber-based sources such as good beam quality, high efficiency and excellent power scalability. In the last few years, polarized laser beams have shown a remarkably growing demand in material processing. In the present contribution we report on a high-power linearly polarized single-transverse-mode Yb-doped fiber amplifier seeded by a linearly polarized Yb:YAG thin disk laser with an M2 of < 1.1 and a degree of linear polarization (DOLP) of 99 % at a output power of 44.5 W and an optical efficiency of 53 %. The fiber amplifier consists of a 7 m long, highly Yb-doped and polarization maintaining double-clad fiber with a core and a cladding diameter of 20 μm and 400 μm, respectively. The active fiber used for the amplifier exhibits a V-parameter of 4.9 and a cladding absorption of 3 dB/m at 976 nm. It was pumped by a fiber-coupled pump diode. With a launched pump power of 717 W, an output power of 440 W with a DOLP of about 96.5 % was extracted from the thin disk master oscillator Yb-doped fiber amplifier. An optical efficiency of 58 % and a gain of 11.7 dB were reached at a seed power of 30 W. A detailed description of our system and the latest experimental results obtained with the fiber described above as well as with other types of active fibers (e.g. non polarization-maintaining fibers) will be presented.
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A. Popp, Chr. Jocher, M. Abdou-Ahmed, A. Voss, T. Graf, "440 W polarized single-transverse-mode CW fiber amplifier with thin disk laser seed source", Proc. SPIE 7721, Solid State Lasers and Amplifiers IV, and High-Power Lasers, 77210Q (19 May 2010); doi: 10.1117/12.854294; https://doi.org/10.1117/12.854294
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KEYWORDS
Fiber amplifiers

Fiber lasers

Optical amplifiers

Disk lasers

Polarization

Oscillators

Absorption

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