Improving the brightness of a multi-kW thin disk laser with a single disk by an aspherical phase-front correction

Birgit Weichelt; David Blazquez-Sanchez; Armin Austerschulte; Andreas Voss; Thomas Graf; Alexander Killi

doi:10.1117/12.854549

19 May 2010 Improving the brightness of a multi-kW thin disk laser with a single disk by an aspherical phase-front correction

Birgit Weichelt, David Blazquez-Sanchez, Armin Austerschulte, Andreas Voss, Thomas Graf, Alexander Killi

Author Affiliations +

Proceedings Volume 7721, Solid State Lasers and Amplifiers IV, and High-Power Lasers; 77210M (2010) https://doi.org/10.1117/12.854549
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

Abstract

Multi-kW beams with high brightness offer advantages in material processing applications with large distance beam propagation such as remote welding. To achieve the combination of high power and low beam parameter product, the thin disk laser concept is widely used due to its power scalability. Nevertheless, the efficient generation of several kilowatts of output power per disk at beam parameter products below ~3 mm·mrad is limited by an aspherical wavefront distortion in the disk and air turbulences in front of it. In the present paper the limiting factors are discussed and a novel method for compensation is presented. The compensating mirror consists of a silica substrate with a top-hat-shaped layer of 100 nm height to generate the desired phase-front correction and a conventional HR-coating on top. To prevent air convection in front of the thin disk crystal, the laser resonator was filled with helium. The experimental results yield a maximum output power of 3.4 kW and an optical efficiency of 49 % with a beam parameter product of ~2.6 mm•mrad (M² ~ 8) at a cooling water temperature of 30 °C.

Citation Download Citation

Birgit Weichelt, David Blazquez-Sanchez, Armin Austerschulte, Andreas Voss, Thomas Graf, and Alexander Killi "Improving the brightness of a multi-kW thin disk laser with a single disk by an aspherical phase-front correction", Proc. SPIE 7721, Solid State Lasers and Amplifiers IV, and High-Power Lasers, 77210M (19 May 2010); https://doi.org/10.1117/12.854549

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