Completely monolithic linearly polarized high-power fiber laser oscillator

Steffen Belke; Frank Becker; Benjamin Neumann; Stefan Ruppik; Ulrich Hefter

doi:10.1117/12.2036531

7 March 2014 Completely monolithic linearly polarized high-power fiber laser oscillator

Steffen Belke, Frank Becker, Benjamin Neumann, Stefan Ruppik, Ulrich Hefter

Proceedings Volume 8961, Fiber Lasers XI: Technology, Systems, and Applications; 896124 (2014) https://doi.org/10.1117/12.2036531
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

We have demonstrated a linearly polarized cw all-in-fiber oscillator providing 1 kW of output power and a polarization extinction ratio (PER) of up to 21.7 dB. The design of the laser oscillator is simple and consists of an Ytterbium-doped polarization maintaining large mode area (PLMA) fiber and suitable fiber Bragg gratings (FBG) in matching PLMA fibers. The oscillator has nearly diffraction-limited beam quality (M² < 1.2). Pump power is delivered via a high power 6+1:1 pump coupler. The slope efficiency of the laser is 75 %. The electro/optical efficiency of the complete laser system is ~30 % and hence in the range of Rofin’s cw non-polarized fiber lasers. Choosing an adequate bending diameter for the Yb-doped PLMA fiber, one polarization mode as well as higher order modes are sufficiently supressed1. Resulting in a compact and robust linearly polarized high power single mode laser without external polarizing components. Linearly polarized lasers are well established for one dimensional cutting or welding applications. Using beam shaping optics radially polarized laser light can be generated to be independent from the angle of incident to the processing surface. Furthermore, high power linearly polarized laser light is fundamental for nonlinear frequency conversion of nonlinear materials.

Citation Download Citation

Steffen Belke, Frank Becker, Benjamin Neumann, Stefan Ruppik, and Ulrich Hefter "Completely monolithic linearly polarized high-power fiber laser oscillator", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 896124 (7 March 2014); https://doi.org/10.1117/12.2036531

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