The generation of 0.5mJ femtosecond laser pulses by coherent combining of two high power high energy fiber chirped-pulse amplifiers is reported. The system is running at a repetition frequency of 175kHz producing 88W of average power after the compressor unit. Polarizing beam splitters have been used to realize an amplifying Mach–Zehnder interferometer, which has been stabilized with a Hänsch–Couillaud measurement system. The stabilized system possesses a measured residual rms phase difference fluctuation between the two branches as low as λ/70rad at the maximum power level. The experiment proves that coherent addition of femtosecond fiber lasers can be efficiently and reliably performed at high B-integral and considerable thermal load in the individual amplifiers.

© 2011 Optical Society of America

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2011 (3)

2010 (3)

2008 (1)

Baer, C.

Bourdon, P.

Breitkopf, S.

Carstens, H.

Daniault, L.

Druon, F.

Eidam, T.

Georges, P.

Golling, M.

Goular, D.

Hädrich, S.

Hanna, M.

Heckl, O.

Hoffmann, H.

Hou, J.

Huber, G.

Jansen, F.

Jauregui, C.

Jiang, Z.

Keller, U.

Klenke, A.

Kränkel, C.

Limpert, J.

Liu, M.

Lombard, L.

Mans, T.

Mottay, E.

Petermann, K.

Peters, R.

Plötner, M.

Poprawe, R.

Rothhardt, J.

Russbueldt, P.

Saraceno, C.

Seise, E.

Stutzki, F.

Südmeyer, T.

Tünnermann, A.

Weitenberg, J.

Xiao, R.

Zaouter, Y.

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Figures (4)

Fig. 1
Fig. 1

Experimental setup of the two channel ( CH 1 + CH 2 ) amplifying interferometer.

Fig. 2
Fig. 2

Autocorrelation traces of CH1 (red), CH2 (green), and the combined laser pulses CH 1 + CH 2 (black) compared to the autocorrelation trace of a single amplifier (blue) emitting the same amount of pulse energy.

Fig. 3
Fig. 3

Measured phase error Δ φ over a time scale of 50 s revealing an rms value of 0.09 rad corresponding to an OPD fluctuation of λ / 70 .

Fig. 4
Fig. 4

Radio frequency spectrum of the OPD with (red) and without (black) stabilization.

Equations (1)

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HC - signal = I 1 · I 2 sin ( Δ φ ) ,