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In this work we present a new method for peak-power scaling in nonlinear CPA-systems. In conventional CPA systems temporal stretching is used to avoid high peak powers developing during the amplification process. However, if the peak power of the stretched pulse is high enough, a considerable amount of nonlinear spectral phase shift (as described by the B-integral) can be accumulated due to self-phase...
The generation of ultra-short pulses is typically governed by the interplay of dispersion and nonlinearity. Ultrashort pulses have high peak-powers which cause nonlinearities. In particular, nonlinearity can cause wave- breaking of ultra-short pulses. This effect imposes limitations on the generation and amplification of femtosecond laser pulses. Chirping of the pulses reduces the peak-power during...
We review the recent results for high peak power and high average power fiber based chirped-pulse amplification systems. Both current challenges and possible approaches for further power scaling are discussed.
We present two scaling concepts for fiber based system. Ultrashort pulses with high peak power are generated while maintaining the advantages of fiber laser systems such as high repetition rate and good beam quality.
We review the main challenges and give design guidelines for high-peak-power high-average-power fiber-based chirped-pulse amplification (CPA) systems. It is clearly pointed out that the lowest order fiber nonlinearity (NL), namely the self-phase modulation, limits the scalability of high-energy ultrashort pulse fiber amplifiers. Therefore, a distinguished difference arises between the consequences...
We report on an ytterbium-doped fiber CPA system delivering millijoule level pulse energy at repetition rates above 100 kHz corresponding to an average power of more than 100 W. The compressed pulses have a pulse duration of 800 fs. To our knowledge, this constitutes the highest pulse energy ever extracted from a fiber based femtosecond laser system and nearly two orders of magnitude higher repetition...
We report on an ytterbium-doped fiber CPA system delivering millijoule level pulse energy at repetition rates above 100 kHz corresponding to an average power of more than 100 W. The compressed pulses have a pulse duration of 800 fs. To our knowledge, this constitutes the highest pulse energy ever extracted from a fiber based femtosecond laser system and nearly two orders of magnitude higher repetition...
The optimum seed pulse-profile for a desired output pulse-profile in saturated ns-pulsed fiber-amplifiers is determined with an analytical solution for the amplification process. It can be regarded as an inverse Frantz-Nodvik-equation for the seed photon-density.
We report on a CPA-system in which degradation of pulse profile due to fiber- nonlinearity is avoided by shaping the spectrum using a spatial light modulator. Clean recompressed pulses are obtained at a B-integral of 16.
We demonstrate a continuously electronically tunable (435-1150 nm) ultrafast source for fluorescence imaging applications that is derived from a visible supercontinuum generated by injecting infrared femtosecond pulses in to a microstructured fibre. We demonstrate this source applied to confocal and wide-field microscopy, as well as multiwell-plate imaging. We also report first application of a tunable...
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