Passive coherent beam combining of two femtosecond fiber chirped-pulse amplifiers

Daniault, Louis; Hanna, Marc; Papadopoulos, Dimitris N.; Zaouter, Yoann; Mottay, Eric; Druon, Frédéric; Georges, Patrick

doi:10.1364/ol.36.004023

Cited by 37 publications

(9 citation statements)

References 9 publications

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“…The highest power level so far has been demonstrated by combining four fiber amplifiers to a record average power of 530 W at pulse energies of 1.3 mJ and pulse peak powers of 1.8 GW [12]. To efficiently superpose the beams, both implementations with active stabilization [12] and ones that do not require active stabilization [13] have been presented. Typically, these are referred to as active and passive setups, respectively.…”

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confidence: 99%

Energy scaling of femtosecond amplifiers using actively controlled divided-pulse amplification

et al. 2014

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Divided-pulse amplification is a promising method for the energy scaling of femtosecond laser amplifiers, where pulses are temporally split prior to amplification and coherently recombined afterwards. We present a method that uses an actively stabilized setup with separated stages for splitting and combining. The additional degrees of freedom can be employed to mitigate the limitations originating from saturation of the amplifier that cannot be compensated in passive double-pass configurations using just one common stage for pulse splitting and combining. In a first proof-of-principle experiment, actively controlled divided pulses are applied in a fiber chirped-pulse amplification system resulting in combined and compressed pulses with an energy of 1.25 mJ and a peak power of 2.9 GW.

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confidence: 99%

Energy scaling of femtosecond amplifiers using actively controlled divided-pulse amplification

et al. 2014

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“…Kong et al reported passive CBC in a two-element nanosecond fiber laser array using a selfimaging resonator [10]. Coherent-polarization beam combination of two fiber amplifiers was demonstrated in the femtosecond domain [11][12][13].…”

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confidence: 99%

“…So, establishing stable passive phase locking in our all-optical feedback loop requires 10 cavity round trips, making this setup immune to all phase noises with frequency contents below 200 kHz as the PRF is 2.023 MHz. Typically, thermal and acoustic noises do not extend significantly beyond 10 kHz [11]. The rapid phasing time makes the all-optical feedback loop highly robust with respect to external perturbation.…”

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confidence: 99%

Coherent beam combination of two nanosecond fiber amplifiers by an all-optical feedback loop

Liu

Zhou

et al. 2012

Opt. Lett.

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A passive coherent beam combination of two nanosecond amplifiers is realized by using an all-optical feedback loop. The width of the combined pulses is 9.7 ns, and the pulse repetition frequency is 2.023 MHz. With the least mismatch between pulse period and time of the cavity round trip in our loop, the visibility of far-field coherent patterns is more than 71%. The dynamics of passive phase locking is studied, and the established time of phase locking of two pulsed amplifiers is at least 10 cavity round trips in the all-optical feedback loop.

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“…A solution to reach higher energies consists of coherently combining the outputs of several fiber amplifiers in free space. This approach has recently been demonstrated in the femtosecond regime with two fiber amplifiers, both in active [1][2][3] and passive [4] architectures.…”

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confidence: 99%

“…Although coherent combining experiments with nonnegligible B integrals have already been demonstrated [2,4], no detailed analysis on dispersion and non-linear phase management has yet been presented. In this Letter, a way to identify and quantify the various contributions to the nonperfect combining efficiency is described.…”

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confidence: 99%

Impact of spectral phase mismatch on femtosecond coherent beam combining systems

et al. 2012

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Passive coherent beam combining of two femtosecond fiber chirped-pulse amplifiers

Cited by 37 publications

References 9 publications

Energy scaling of femtosecond amplifiers using actively controlled divided-pulse amplification

Energy scaling of femtosecond amplifiers using actively controlled divided-pulse amplification

Coherent beam combination of two nanosecond fiber amplifiers by an all-optical feedback loop

Impact of spectral phase mismatch on femtosecond coherent beam combining systems

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