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Proceedings Paper

A 25kW fiber-coupled diode laser for pumping applications
Author(s): Joerg Malchus; Volker Krause; Arnd Koesters; David G. Matthews
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Paper Abstract

In this paper we report the development of a new fiber-coupled diode laser for pumping applications capable of generating 25 kW with four wavelengths. The delivery fiber has 2.0 mm core diameter and 0.22 NA resulting in a Beam Parameter Product (BPP) of 220 mm mrad. To achieve the specifications mentioned above a novel beam transformation technique has been developed combining two high power laser stacks in one common module. After fast axis collimation and beam reformatting a beam with a BPP of 200 mm mrad x 40 mm mrad in the slow and fast-axis is generated. Based on this architecture a customer-specific pump laser with 25 kW optical output power has been developed, in which two modules are polarization multiplexed for each wavelength (980nm, 1020nm, 1040m and 1060nm). After slow-axis collimation these wavelengths are combined using dense wavelength coupling before focusing onto the fiber endface. This new laser is based on a turn-key platform, allowing straight-forward integration into any pump application. The complete system has a footprint of less than 1.4m² and a height of less than 1.8m. The laser diodes are water cooled, achieve a wall-plug efficiency of up to 60%, and have a proven lifetime of <30,000 hours. The new beam transformation techniques open up prospects for the development of pump sources with more than 100kW of optical output power.

Paper Details

Date Published: 7 March 2014
PDF: 10 pages
Proc. SPIE 8965, High-Power Diode Laser Technology and Applications XII, 89650B (7 March 2014); doi: 10.1117/12.2039110
Show Author Affiliations
Joerg Malchus, Laserline GmbH (Germany)
Volker Krause, Laserline GmbH (Germany)
Arnd Koesters, Laserline GmbH (Germany)
David G. Matthews, Laserline Inc. (United States)


Published in SPIE Proceedings Vol. 8965:
High-Power Diode Laser Technology and Applications XII
Mark S. Zediker, Editor(s)

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