Two-channel pulse synthesis to overcome gain narrowing in femtosecond fiber amplifiers

Guichard, Florent; Hanna, Marc; Lombard, Laurent; Zaouter, Yoann; Hönninger, Clemens; Morin, Franck; Druon, Frédéric; Mottay, Eric; Georges, Patrick

doi:10.1364/ol.38.005430

Cited by 16 publications

(6 citation statements)

References 13 publications

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“…The time series of the phase noise between two adjacent cores in the MCF (blue) and two separate double-clad (DC) fiber amplifiers (green) is shown in Fig. 3(a) for a total duration of 50 s. The phase noise for the DC amplifiers was measured from the setup presented in [18] at a comparable output power as the MCF of 1.5 W. Each DC amplifier was 2-m in length. The graph shows a significantly larger amount of phase noise for two separate fiber amplifiers with a total peak-peak difference in phase of 180 rad as compared only 2.6 rad for two cores in an MCF.…”

Section: Phase Noise Characterization Of Mcf and Comparison With Sepamentioning

confidence: 99%

Coherent beam combining with an ultrafast multicore Yb-doped fiber amplifier

Ramirez¹,

Hanna²,

Bouwmans³

et al. 2015

Opt. Express

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Active coherent beam combination using a 7-non-coupled core, polarization maintaining, air-clad, Yb-doped fiber is demonstrated as a monolithic and compact power-scaling concept for ultrafast fiber lasers. A microlens array matched to the multicore fiber and an active phase controller composed of a spatial light modulator applying a stochastic parallel gradient descent algorithm are utilized to perform coherent combining in the tiled aperture geometry. The mitigation of nonlinear effects at a pulse energy of 8.9 µJ and duration of 860 fs is experimentally verified at a repetition rate of 100 kHz. The experimental combining efficiency results in a far field central lobe carrying 49% of the total power, compared to an ideal value of 76%. This efficiency is primarily limited by group delay differences between cores which is identified as the main drawback of the system. Minimizing these group delay issues, e.g. by using short and straight rod-type multicore fibers, should allow a practical power scaling solution for femtosecond fiber systems.

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Section: Phase Noise Characterization Of Mcf and Comparison With Sepamentioning

confidence: 99%

Coherent beam combining with an ultrafast multicore Yb-doped fiber amplifier

Ramirez¹,

Hanna²,

Bouwmans³

et al. 2015

Opt. Express

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“…In the same year, Guichard et al utilized SCBC to overcome the gain narrowing in femtosecond laser pulses through combining two-channel pulse synthesis [309]. In this regard, Rigud et al proposed a new version of SCBC that was based on amplification on a single multicore fiber [310].…”

Section: Spectral Cbc (Spectral Pulse Synthesis)mentioning

confidence: 99%

Towards Ultimate High-Power Scaling: Coherent Beam Combining of Fiber Lasers

2021

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Fiber laser technology has been demonstrated as a versatile and reliable approach to laser source manufacturing with a wide range of applicability in various fields ranging from science to industry. The power/energy scaling of single-fiber laser systems has faced several fundamental limitations. To overcome them and to boost the power/energy level even further, combining the output powers of multiple lasers has become the primary approach. Among various combining techniques, the coherent beam combining of fiber amplification channels is the most promising approach, instrumenting ultra-high-power/energy lasers with near-diffraction-limited beam quality. This paper provides a comprehensive review of the progress of coherent beam combining for both continuous-wave and ultrafast fiber lasers. The concept of coherent beam combining from basic notions to specific details of methods, requirements, and challenges is discussed, along with reporting some practical architectures for both continuous and ultrafast fiber lasers.

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“…Due to gain narrowing, workhorse Yb-doped crystals, such as Yb:YAG and Yb:tungstate, typically generate pulses in the range from 400 fs to 1 ps pulse duration after chirped pulse amplification. To generate even shorter pulses, other strategies have proved viable, such as the adoption of broader gain bandwidth disordered media [6,7] , a combination of gain media with a slightly shifted gain spectrum [8][9][10] or spectral coherent synthesis [11,12] . Nonetheless, the disordered media display poor thermal conductivity while the other two Correspondence to: X. Liang, State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.…”

Section: Introductionmentioning

confidence: 99%

An efficient high-power femtosecond laser based on periodic-layered-Kerr media nonlinear compression and a Yb:YAG regenerative amplifier

Guo

Gao

Sun

et al. 2022

High Pow Laser Sci Eng

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We demonstrate an efficient ultrafast source with 195 fs pulse duration, 54 W average power at 200 kHz repetition rate, and near diffraction-limited beam quality. The compact setup incorporate a thin disk Yb:YAG regenerative amplifier (RA) and a subsequent nonlinear pulse compression stage with periodic layered Kerr media (PLKM), which is one of the multiple-thin-solid-plate schemes based on nonlinear resonator theory.In virtue of the formation of quasi-stationary spatial soliton in PLKM, the near diffractionlimited beam quality of RA remained almost undisturbed after post-compression. The nonlinear pulse compression module is simple and efficient with a transmission of 96%.To the best our knowledge, for pulse energy over 200 μJ, this is the highest output power reported for the multiple-thin-solid-plate scheme. This source manifests an economical

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Two-channel pulse synthesis to overcome gain narrowing in femtosecond fiber amplifiers

Cited by 16 publications

References 13 publications

Coherent beam combining with an ultrafast multicore Yb-doped fiber amplifier

Coherent beam combining with an ultrafast multicore Yb-doped fiber amplifier

Towards Ultimate High-Power Scaling: Coherent Beam Combining of Fiber Lasers

An efficient high-power femtosecond laser based on periodic-layered-Kerr media nonlinear compression and a Yb:YAG regenerative amplifier

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