Presentation + Paper
15 February 2018 Beam shaping of focused radiation of multimode lasers
Alexander Laskin, Joerg Volpp, Vadim Laskin, Aleksei Ostrun
Author Affiliations +
Abstract
Performance of various laser technologies like welding, metal sheet cutting based on the use of powerful multimode fiber lasers, fiber-coupled solid-state and diode lasers can be improved by manipulation of energy distribution perpendicular and along optical axis. Welding, cladding with 0.5-2 mm size working spots benefit from “inverse-Gauss” intensity profiles, and doubled or tripled spots perpendicular to axis are good solutions to provide more uniform temperature profiles on a workpiece. Thick metal sheet cutting, some types of welding get benefits from distributing the laser energy along the optical axis resulting in more efficient usage of laser energy, higher and more stable cutting edge quality, faster processing. Since the radiation of multimode lasers is of low spatial coherence, characterized by big Beam Parameter Products (BPP) or M2 values, it is difficult to control the intensity distribution by methods other than imaging of a fiber end using a collimator and focusing objective. A promising suggested solution is combining of imaging the fiber end and geometrical separation of focused spots either perpendicular to or along the optical axis using dedicated optical components. Thus, energy of high power lasers is distributed among multiple foci. To provide reliable operation with multi-kW lasers and avoid damages the multi-focus optical devices are designed as refractive elements with smooth optical surfaces. The paper presents descriptions of multi-focus optics as well as examples of intensity profile measurements of beam caustics and application results.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alexander Laskin, Joerg Volpp, Vadim Laskin, and Aleksei Ostrun "Beam shaping of focused radiation of multimode lasers", Proc. SPIE 10525, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VII, 1052507 (15 February 2018); https://doi.org/10.1117/12.2287980
Advertisement
Advertisement
RIGHTS & PERMISSIONS
Get copyright permission  Get copyright permission on Copyright Marketplace
KEYWORDS
Beam shaping

Laser cutting

Fiber lasers

Laser energy

Multimode fibers

Collimators

Beam splitters

RELATED CONTENT

Fiber laser performance in industrial applications
Proceedings of SPIE (February 22 2013)
Optics for multimode lasers with elongated depth of field
Proceedings of SPIE (February 22 2017)
Dynamic high power laser beam shaping device
Proceedings of SPIE (February 27 2019)

Back to Top