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Coherent combining of ultrashort fiber-amplified laser pulses

: Seise, E.; Klenke, A.; Breitkopf, S.; Plötner, M.; Limpert, J.; Tünnermann, A.


Dawson, J.W. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers VIII: Technology, Systems, and Applications : 22.-26.1.2011, San Francisco, California, USA, SPIE Photonics West
Bellingham, WA: SPIE, 2011 (Proceedings of SPIE 7914)
ISBN: 978-0-8194-8451-2
Paper 79141D
Conference "Fiber Lasers - Technology, Systems, and Applications" <8, 2011, San Francisco/Calif.>
Conference Paper
Fraunhofer IOF ()
CPA system; fiber amplifier; coherent beam combining; ultrashort pulse

We report on a novel concept to scale the performance of ultra-fast lasers by means of coherent combination. Pulses from a single mode-locked laser are distributed to a number of spatially separated fiber amplifiers and coherently combined after amplification. The splitting and combination process is based on the polarization combining technique using polarization cubes. A Hänsch-Couillaud detector measures the polarization state of the combined beam. The error signal (deviation from linear polarization) is used to stabilize the optical path lengths in the different channels with a piezo mounted mirror. In a proof-of-principle experiment the combination of two femtosecond fiber-based amplifiers in a CPA systems is presented. A combining efficiency as high as 97% has been achieved. Additional measurements were carried out to investigate the stability of the system. The concept offers a unique scaling potential and can be applied to all ultrafast amplification schemes independent of the architecture of the gain medium.