Impact of spectral phase mismatch on femtosecond coherent beam combining systems

Daniault, Louis; Hanna, Marc; Lombard, Laurent; Zaouter, Yoann; Mottay, Eric; Goular, Didier; Bourdon, P.; Druon, Frédéric; Georges, Patrick

doi:10.1364/ol.37.000650

Cited by 13 publications

(4 citation statements)

References 7 publications

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“…In the best case, a value of 1 is achievable and, therefore, a result as close as possible to 1 is desired. Hereby, smaller differences between the channels lead to a higher achievable combination efficiency [15], [22], [23]. A high combination efficiency also has consequences for the combined emission.…”

Section: General Considerationsmentioning

confidence: 99%

Coherent Beam Combination of Ultrafast Fiber Lasers

Klenke

Müller

Stark

et al. 2018

IEEE J. Select. Topics Quantum Electron.

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The performance of fiber laser systems has drastically increased over recent decades, which has opened up new industrial and scientific applications for this technology. However, currently a number of physical effects prevents further power scaling. Coherent combination of beams from multiple emitters has been established as a power scaling technique beyond these limitations. It is possible to increase the average power, and for pulsed laser systems, also parameters such as the pulse energy and the peak power. To realize such laser systems, various aspects have to be taken into account that include beam combination elements, stabilization systems, and the output parameters of the individual amplifiers. After an introduction to the topic, various ways of implementing coherent beam combination for ultrashort pulses are explored. Besides the spatial combination of beams, the combination of pulses in time will also be discussed. Recent experimental results will be presented, including multidimensional (i.e., spatial and temporal) combination. Finally, an outlook on possible further developments is given, focused on scaling the number of combinable beams and pulses.

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Section: General Considerationsmentioning

confidence: 99%

Coherent Beam Combination of Ultrafast Fiber Lasers

Klenke

Müller

Stark

et al. 2018

IEEE J. Select. Topics Quantum Electron.

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“…In the time domain, some care is required to balance the amount of group-velocity dispersion introduced by each arm, and a tunable delay line is usually included in each arm to fine-tune the group delay. In highly nonlinear systems (B>π rad), the amount of accumulated nonlinear phase should also be matched to maximize combining efficiency (Daniault et al 2012a(Daniault et al , 2012b. It is worthwhile to point out that the polarization state at the output of amplifiers must also be fixed, which can be guaranteed by the use of polarization-maintaining fibers.…”

Section: Spatial: Coherent Beam Combiningmentioning

confidence: 99%

Coherent combination of ultrafast fiber amplifiers

Hanna

Guichard

Zaouter

et al. 2016

J. Phys. B: At. Mol. Opt. Phys.

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We review recent progress in coherent combining of femtosecond pulses amplified in optical fibers as a way to scale the peak and average power of ultrafast sources. Different methods of achieving coherent pulse addition in space (beam combining) and time (divided pulse amplification) domains are described. These architectures can be widely classified into active methods, where the relative phases between pulses are subject to a servomechanism, and passive methods, where phase matching is inherent to the geometry. Other experiments that combine pulses with different spectral contents, pulses that have been nonlinearly broadened or successive pulses from a mode-locked laser oscillator, are then presented. All these techniques allow access to unprecedented parameter range for fiber ultrafast sources.

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“…The similar difficulty is a necessity of providing a high degree of the spatial overlapping of 10 (3−4) elementary Gaussian beams amplified inside fiber array in a sequence of 10 (3−4) demultiplexing (beam combining) beamsplitters. The more serious complications are due to nonlinear selfphase modulation (SPM or B-integral discrepancy) [13] and temporal envelope transformation because of gain saturation of laser amplifiers [14]. The nanosecond laser pulses with exponential envelope sech(t − zn 0 /c) move in a self-similar style with superluminal envelope speed while Gaussian pulses demonstrate self-steepening of pre- MO is master ocillator, CPA is chirped pulse amplifying array, BS fiber [1] is entrance beamsplitter tree, which may be both free space and fiber array, M are ordinary retro-mirrors, BST is free-space output binary BS tree [9,11], λ 3 T is target of volume λ 3 .…”

Section: Introductionmentioning

confidence: 99%

Coherent chirped pulse laser network with Mickelson phase conjugator

Okulov¹

2014

Appl. Opt.

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The mechanisms of nonlinear phase-locking of a large fiber amplifier array are analyzed. It is shown that Michelson phase conjugating configuration with double passage through array of fiber amplifiers have the definite advantages compared to one-way fiber array coupled in a MachZehnder configuration. Regardless to amount of synchronized fiber amplifiers Michelson phaseconjugating interferometer is expected to do a perfect compensation of the phase-piston errors and collimation of backwardly amplified fiber beams on entrance/output beamsplitter. In both configurations the nonlinear transformation of the stretched pulse envelope due to gain saturation is capable to randomize the position of chirp inside envelope thus it may reduce the visibility of interference pattern at output beamsplitter. A certain advantages are inherent to the sech-form temporal envelope because of exponential precursor and self-similar propagation in gain medium. The Gaussian envelope is significantly compressed in a deep gain saturation regime and frequency chirp position inside pulse envelope is more deformed.

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Impact of spectral phase mismatch on femtosecond coherent beam combining systems

Cited by 13 publications

References 7 publications

Coherent Beam Combination of Ultrafast Fiber Lasers

Coherent Beam Combination of Ultrafast Fiber Lasers

Coherent combination of ultrafast fiber amplifiers

Coherent chirped pulse laser network with Mickelson phase conjugator

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