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Coherent addition of fiber-amplified ultrashort laser pulses

Enrico Seise, Arno Klenke, Jens Limpert, and Andreas Tünnermann

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Abstract

We report on a novel approach of performance scaling 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. Splitting and combination is achieved by polarization cubes, i.e. the approach bases on polarization combining. A Hänsch-Couillaud detector measures the polarization state at the output. The error signal (deviation from linear polarization) is used to stabilize the synchronization of different channels. In a proof-of-principle experiment the combination of two femtosecond fiber-based CPA systems is presented. A combining efficiency as high as 97% has been achieved. The technique offers a unique scaling potential and can be applied to all ultrafast amplification schemes independent of the architecture of the gain medium.

©2010 Optical Society of America

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Supplementary Material (1)

Media 1: MOV (1567 KB)     

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Figures (7)
Fig. 1
Fig. 1 Schematic setup of coherent addition of ultrashort laser pulses; Δφ: element for path length matching.

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Fig. 2
Fig. 2 Illustration of polarization splitting and combining to create an active interferometer.

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Fig. 3
Fig. 3 Experimental setup of coherent addition of two femtosecond fiber-based CPA systems in a Mach-Zehnder-type configuration using polarization combining.

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Fig. 4
Fig. 4 Measured spectra a) at 110 mW combined power (B = 1.3 rad) and b) at 530 mW combined power (B = 5.4 rad) of the individual amplifiers and the combined output.

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Fig. 5
Fig. 5 Measured autocorrelation traces of the combined and compressed fiber CPA output at different power levels.

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Fig. 6
Fig. 6 Piezo positions as a function of time for two different power levels.

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Fig. 7
Fig. 7 CCD Camera images (Media 1) after further analyzer cube. left: locking off, right: locking on.

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Tables (1)

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Table 1 Summarized experimental data of the combined fiber CPA system

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Equations (1)

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D O L P = P max − P min P max + P min   and system efficiency = P lin P 1 + P 2
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