In this paper we present the next step on the roadmap “system scalability towards an output power above 100 kW”, first
time presented in 2014 [1].
To take a step forward the optical power of the fiber-coupled diode laser has been increased beyond the power level
40kW. The power conversion efficiency exceeds 40%. The laser contains modules with 4 different wavelengths (960nm,
1020nm, 1040nm, 1060nm) there are two modules for each wavelength polarization multiplexed. After the slow-axis
collimation these wavelengths are combined using dense wavelength coupling before focusing onto the fiber endface.
The delivery-fiber is an uncoated fiber with a diameter of 2 mm and NA 0.22 corresponding a BPP of 220 mm mrad.
In a stability test the laser delivered a constant maximum output power with less than ±0.5 % variation over 100h.
Further results of the optical properties of the laser will be presented in this paper.
This new laser is based on a turn-key industrial platform, allowing straight-forward integration into almost any industrial
application, like welding or large area heat treatment. As application examples laser welding of thick sheet metal and
pumping of an active fiber will be presented. The footprint of the complete system is 2.8 m² with a height below 1.8 m.
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.
New solid-state laser architectures require higher pump powers. In this paper we report the development of a new fibercoupled
diode laser capable of generating 15 kW from a 2 mm diameter fiber with a 0.22 NA, representing a brightness
of 220 mm.mrad at a single wavelength. In this design a special beam transformation technique has been developed to
achieve these specifications at a single wavelength without the wavelength combination technique employed in high
power diode lasers used in material processing applications. The specific laser presented here is at 938 nm with a
spectral bandwidth of 3.1 nm FWHM, but the same architecture is possible for wavelengths between 910 and 1060 nm.
We discuss in this paper, highly efficient techniques for CW non-linear frequency conversion using novel pump laser sources and high efficiency laser gain materials We also address the limitations of non-linear conversion processes and evaluate the performance of conventional non-linear optical materials that have recently been modified for non- critical phase matching (NCPM) applications, such as NCPM- KTP. Moreover, we outline the significant improvements in performance of new non-linear materials for frequency conversion of fundamental wavelength laser sources, utilizing recent advances in application tailored materials with high non-linear coefficients such as PPLN. In particular, the issues related to efficient intracavity higher harmonic generation, including intracavity doubling and intracavity tripling as well as intracavity and extracavity optical parametric oscillator development are described.
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