kW Class Pump Laser Modules

Our pump modules for high-energy-class solid-state laser systems consist of diode laser stacks, whose individual beams are shaped and combined into a beam with high energy density by means of simple optical components. Such modules enable efficient pumping of short-pulse solid-state laser systems (pulse duration 10^-6 bis 10^-9 s) with high pulse energies in the Joule range. The overall pumping power scales with the number of stacks and emitters up to the kW range.

Applications

Pumping of high-energy class solid-state laser systems (z. B. Yb:YAG, Nd:YAG) with high pulse repetition rates. Such systems are increasingly demanded in research (e.g. X-ray lasers, attosecond spectroscopy, particle accelarators, material processing)
Direct material processing in industry

The FBH is a member institute of the EuPRAXIA-Konsortium.

Large pump module for laser material processing with a fiber connection — Pump module with ~6 kW output power from fiber

Two generations of pump modules in size comparison - the current module is significantly smaller — Two generations of pump modules

Pump modules in a rack, installed for a customer — Pump modules, installed for a customer

Wavelengths

650 to 1060 nm, e.g. 940 nm for pumping of Yb:YAG thin-disk amplifiers

Assembly

Diode laser stacks with lateral cooling and high conversion efficiency (η ~ 60%)
Coupling into fiber

Typical Data

QCW operation t_P= 1 ms, f = 10...200 Hz
Optical fiber with 1.9 mm core diameter, NA 0.22
Peak output power from fiber > 5.5 kW
Electro-optical efficiency ~ 50%
Average power from fiber > 1 kW
Peak-power without fiber ~ 7 kW

Diode pumps for future laser plasma accelerators: perspectives from research and industry

Proc. of SPIE, vol. 12867, High-Power Diode Laser Technology XXII, Photonics West, San Francisco, USA, Jan 27 - Feb 1, 128670R (2024).

High-brightness 1.4 kW 780 nm QCW laser pump module with low-loss coupling into 1 mm fiber up to 50 % duty cycle

Proc. of SPIE, vol. 11983, High-Power Diode Laser Technology XX, Photonics West, Hybrid Event, San Francisco, USA, Jan 22-27, 1198309 (2022).

Kilowatt-class, High Duty Cycle, Passively Side-cooled 780 nm Diode Laser Stacks as Pumps for Pulsed MIR Lasers

OSA Laser Congress 2020 (ASSL, LAC), Virtual Event, Oct. 13-16, OSA Technical Digest (Optical Society of America, 2020), ISBN: 978-1-943580-84-2, p. JTh2A.26 (2020).

High Duty Cycle, High Repetition Rate High Brightness Diode Laser Pulsed-Pump-Sources

Advanced Solid State Lasers Conference (ASSL 2019), Vienna, Austria, Sep. 29 - Oct. 3, ISBN: 978-1-943580-68-2, paper JW2A.29 (2019).

Novel High-Power, High Repetition Rate Laser Diode Pump Modules Suitable for High-Energy Class Laser Facilities

MDPI instruments, vol. 3, no. 3, pp. 34 (2019).

Progress in high duty cycle, highly efficient fiber coupled 940-nm pump modules for high-energy class solid state lasers

Proc. SPIE 10513, Components and Packaging for Laser Systems IV, Photonics West, San Francisco, USA, Jan 27 - Feb 01, 1051319 (2018).

High duty cycle, highly efficient fiber coupled 940-nm pump module for high-energy solid-state lasers

High Power Laser Sci. Eng., vol. 4, e3 (2016).