A 25kW fiber-coupled diode laser for pumping applications

Joerg Malchus; Volker Krause; Arnd Koesters; David G. Matthews

doi:10.1117/12.2039110

7 March 2014 A 25kW fiber-coupled diode laser for pumping applications

Joerg Malchus, Volker Krause, Arnd Koesters, David G. Matthews

Proceedings Volume 8965, High-Power Diode Laser Technology and Applications XII; 89650B (2014) https://doi.org/10.1117/12.2039110
Event: SPIE LASE, 2014, San Francisco, California, United States

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.

Citation Download Citation

Joerg Malchus, Volker Krause, Arnd Koesters, and David G. Matthews "A 25kW fiber-coupled diode laser for pumping applications", Proc. SPIE 8965, High-Power Diode Laser Technology and Applications XII, 89650B (7 March 2014); https://doi.org/10.1117/12.2039110

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available