Coherent beam combining of 61 femtosecond fiber amplifiers

Fsaifes, Ihsan; Daniault, Louis; Bellanger, Séverine; Veinhard, Matthieu; Bourderionnet, Jérôme; Larat, Christian; Lallier, Éric; Durand, Éric; Brignon, A.; Chanteloup, Jean-Christophe

doi:10.1364/oe.394031

Cited by 127 publications

(53 citation statements)

References 18 publications

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“…Continuation of this research splits in two main topics: on one side, we will continue to improve the Two-Wavelength PISTIL process by conducting very high dynamic segmented wavefront analysis (up to 50-100λ) on a femtosecond coherently combined laser array having 61 channels [29]. On another side, the comparison work between two-wavelength PISTIL and PSI might continue with analysis of the DM and a passive stepped measurement standard.…”

Section: Resultsmentioning

confidence: 99%

High-dynamic range segmented mirror metrology by two-wavelength PISTIL interferometry: demonstration and performance

Rouzé¹,

Primot²,

Lanzoni³

et al. 2020

Opt. Express

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The PISTIL interferometry has been recently developed for the wavefront sensing of phase delays (pistons) and tilts of segmented surfaces, used in many domains such as astronomy, high-power lasers or ophthalmology. In this paper, we propose a two-wavelength version of this interferometer developed to bypass the dynamic range limitation of the ambiguous 2π phase wrapping. Principle of the technique is presented, along with experimental results obtained with a demonstration deformable mirror PTT-111 from Iris AO. Above wavelength pistons are measured with a precision and accuracy below λ/100, making the two-wavelength PISTIL interferometry a high-dynamic range technique. To prove these performances, we successfully compare the results in terms of precision and accuracy with those of a reference phase-shifting Interferometer, from a blind experimentation.

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Section: Resultsmentioning

confidence: 99%

High-dynamic range segmented mirror metrology by two-wavelength PISTIL interferometry: demonstration and performance

Rouzé¹,

Primot²,

Lanzoni³

et al. 2020

Opt. Express

View full text Add to dashboard Cite

show abstract

“…It has indeed been demonstrated that as low as 8 camera pixels per beamlet would be sufficient to ensure an efficient CBC [19]. It is also worth noting that XCAN carries as well longitudinal pulse energy distribution tailoring ability thanks to its pulse shaper [10] and, although not implemented yet on our experimental setup, individual polarization adjustment could also be foreseen.…”

Section: Fig 2 Near Field Interference Pattern Of 61 Beamlets As Opmentioning

confidence: 90%

“…. More details about the experimental setup of the CBC of 61 fiber amplifiers are given in reference [10].…”

Section: Fig 1 Xcan Laser Head (Center) Collimating Microlens Arramentioning

confidence: 99%

“…In this paper, we demonstrate the real-time generation of high power OAM beams using the XCAN CBC laser prototype [10] developed by Ecole Polytechnique and the Thales company.…”

Section: Fig 2 Near Field Interference Pattern Of 61 Beamlets As Opmentioning

confidence: 99%

“…The phase of each individual beam is controlled in real time (kHz) through the combined use of Variable Optical Delay Lines (VODL) and piezo-mechanical Fiber Stretchers (FS) [10]. The Digital-to-Analog Converter (DAC) addressing the FS currently limits the accuracy at about ± /50.…”

Section: Fig 2 Near Field Interference Pattern Of 61 Beamlets As Opmentioning

confidence: 99%

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