Stephan Klingebiel

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The first rare-earth-doped fiber lasers were operated in the early 1960s, and produced a few milliwatts at a wavelength around 1 mum. Since the beginning of the decade, an enormous increase of fiber laser output power has been reported, the realm of kilowatt power has been entered, and power levels as high as 100 kW are envisaged. Apart from the power,(More)
In results-based approaches, funding is linked to pre-agreed results that are defined in the form of indicators. Disbursements only take place once progress in the indicators has been verified. This places high requirements on the quality of indicators used. Different development actors have started implementing results-based approaches, yet little(More)
A method for writing a Bragg grating in a glass optical waveguide is provided. Ultrafast optical pulses are generated, preferably in the femtosecond range and 5 having a writing wavelength in the range of 300nm to 700nm and an intensity sufficient to induce a change of refractive index in the waveguide through densification. The optical pulses are(More)
Fiber lasers have been established as power-scalable laser architecture. Continuous-wave output powers well above the kW-barrier have been demonstrated with diffraction-limited beam quality. However, even the most advanced fiber laser is limited by nonlinear effects, fiber facet damage or thermal issues at a certain power level. Spectral combining of(More)
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