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21 February 2011 Coherent combining of ultrashort fiber-amplified laser pulses
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Abstract
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 Hansch-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.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Enrico Seise, Arno Klenke, Sven Breitkopf, Marco Plötner, Jens Limpert, and Andreas Tünnermann "Coherent combining of ultrashort fiber-amplified laser pulses", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79141D (21 February 2011); https://doi.org/10.1117/12.874769
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