Active fibers posses many inherent advantages such as a large surface-to-volume ratio, a high signal gain and an excellent beam quality. These properties result in compact, single-pass and even monolithic ultrashort-pulse laser systems, which are capable of emitting average powers up to the kilowatt level. But also in terms of the available pulse energies and peak-powers, state-of-the-art fiber lasers have become competitive to other solid-state-laser concepts. The reason for the tremendous performance increase that has been seen in recent years is the exploitation and steady improvement of two technologies: chirped-pulse amplification (CPA) and large-mode-area fibers. Both concepts reduce the intensity in the fiber core during propagation and they, therefore, allow for average and peak-power scaling.


Highly efficient dielectric diffraction grating employed in a CPA stretcher/compressor unit.

In our group we are operating different high-power fiber-CPA systems. They are steadily improved and employed for different applications. The related research includes many different fields of ultrafast optics and laser physics. Our main topics include fiber design, pulse stretching and compression techniques, active and passive pulse shaping, investigations on the dynamics of nonlinear CPA systems, nonlinear pulse compression schemes, pump concepts, cooling techniques and much more.

Chirped-mirror compressor for the nonlinear compression of high peak power pulses in a hollow-core fiber.

As a result of these efforts, the fiber-CPA systems, which are developed and build at the IAP, posses the world's largest average powers, pulse energies and peak powers. Furthermore, many of these lasers are worldwide used for a variety of applications within the framework of our scientific and industrial cooperations.

Selected publicatons:

[1] T. Eidam, S. Hanf, E. Seise, T. V. Andersen, T. Gabler, C. Wirth, T. Schreiber, J. Limpert, and A. Tünnermann, "Femtosecond fiber CPA system emitting 830 W average output power," Opt. Lett. 35, 94-96 (2010), link to journal

[2] T. Eidam, J. Rothhardt, F. Stutzki, F. Jansen, S. Hädrich, H. Carstens, C. Jauregui, J. Limpert, and A. Tünnermann, "Fiber chirped-pulse amplification system emitting 3.8 GW peak power," Opt. Express 19, 255-260 (2011), link to journal

[3] A. Klenke, E. Seise, S. Demmler, J. Rothhardt, S. Breitkopf, J. Limpert, and A. Tünnermann, "Coherently-combined two channel femtosecond fiber CPA system producing 3 mJ pulse energy," Opt. Express 19, 24280-24285 (2011), link to journal


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