Beam combining of ytterbium fiber amplifiers (Invited)

Augst, Steven J.; Ranka, Jinendra K.; Fan, T. Y.; Sánchez, A.

doi:10.1364/josab.24.001707

Cited by 198 publications

(89 citation statements)

References 75 publications

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“…Each structure will require a phase control loop to allow for acceleration through successive structures. Both small-fast (acoustic, <10 kHz, < 1µm) and large-slow control (thermal time scale of seconds to hours, >10µm) of the phase will be necessary (Augst et al, 2007). By monitoring the energy line-width as well as the timing of the electron bunches, successful acceleration through the structures may be confirmed.…”

Section: Fig 38 (Color Online)mentioning

confidence: 98%

Dielectric laser accelerators

England¹,

Noble²,

Bane³

et al. 2014

Rev. Mod. Phys.

341

184

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The use of infrared lasers to power optical-scale lithographically fabricated particle accelerators is a developing area of research that has garnered increasing interest in recent years. We review the physics and technology of this approach, which we refer to as dielectric laser acceleration (DLA). In the DLA scheme operating at typical laser pulse lengths of 0.1 to 1 ps, the laser damage fluences for robust dielectric materials correspond to peak surface electric fields in the GV/m regime. The corresponding accelerating field enhancement represents a potential reduction in active length of the accelerator between 1 and 2 orders of magnitude. Power sources for DLA-based accelerators (lasers) are less costly than microwave sources (klystrons) for equivalent average power levels due to wider availability and private sector investment. Due to the high laser-to-particle coupling efficiency, required pulse energies are consistent with tabletop microJoule class lasers. Combined with the very high (MHz) repetition rates these lasers can provide, the DLA approach appears promising for a variety of applications, including future high energy physics colliders, compact light sources, and portable medical scanners and radiative therapy machines.

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Section: Fig 38 (Color Online)mentioning

confidence: 98%

Dielectric laser accelerators

England¹,

Noble²,

Bane³

et al. 2014

Rev. Mod. Phys.

341

184

View full text Add to dashboard Cite

show abstract

“…For example, YDFLs at wavelength ranges of 1010-1020 nm with narrow bandwidths can not only be frequency quadrupled to 25× nm for laser-induced fluorescence, optical refrigeration, semiconductor inspection and atomic trapping applications [3][4][5][6][7] but can also be used for tandem-pumping high-power C-band (1.06-1.12 µm) YDFLs, due to their smaller quantum defect which gives higher conversion efficiency and lower thermal load [8,9] . Moreover, as an outstanding pathway for achieving scalable high-power lasers with good beam quality, spectral beam combining (SBC) combines multiple lasers into a single beam for maximum output power [10][11][12][13][14][15][16][17] . To date, the most common wavelength range for SBC is from 1050 to 1080 nm.…”

Section: Introductionmentioning

confidence: 99%

A high-power narrow-linewidth 1018 nm fiber laser based on a single-mode–few-mode–single-mode structure

Jiang

Zhang

et al. 2015

High Pow Laser Sci Eng

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We demonstrate an all-fiber high-power Yb-doped 1018 nm fiber laser with a Gaussian-shaped output beam profile based on a mismatched structure, which consists of a pair of single-mode fiber Bragg gratings and a section of few-mode double-cladding gain fiber. The output power is up to 107.5 W with an optical-to-optical efficiency of 63%, and the 3 dB band is 0.26 nm at this power level. Such a structure of single-mode-few-mode-single-mode fiber oscillator can be used to generate high-power narrow-linewidth lasing with excellent beam quality in other spectral ranges.

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“…Fiber lasers have the beneficial features of long lifetimes, high efficiency, 2 and high beam quality. 3 A single mode fiber laser can now provide multiple kilowatts of power at wall plug efficiencies >25%. 4 The weight-to-power ratio for fiber lasers is approaching that of chemical devices.…”

Section: Introductionmentioning

confidence: 99%

Comparison of coherent and incoherent laser beam combination for tactical engagements

et al. 2012

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Abstract. The performance of a multibeam laser system is evaluated for coherent and incoherent beam combination under tactical scenarios. For direct comparison, identical aperture geometries are used for both, coherent or incoherent, combination methods. The analysis assumes a multilaser source coupled with a conventional 0.32 m diameter, on-axis, beam director. Parametric analysis includes variations over residual errors, beam quality, atmospheric effects, and scenario geometry. Analytical solutions from previous results are used to evaluate performance for the vacuum case, providing an upper bound on performance and a backdrop for organizing the multitude of effects as they are analyzed. Wave optics simulations are used for total system performance. Each laser in the array has a wavelength of 1.07 μm, 10 kW (25 kW) output power, and Gaussian exitance profile. Both tracking and full-aperture adaptive optics are modeled. Three tactical engagement geometries, air to surface, surface to air, and surface to surface, are evaluated for slant ranges from 2.5 to 10 km. Two near-median atmospheric profiles were selected based upon worldwide climatological data. The performance metric used is beam propagation efficiency for circular target diameters of 5 and 10 cm. © 2012 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Beam combining of ytterbium fiber amplifiers (Invited)

Cited by 198 publications

References 75 publications

Dielectric laser accelerators

Dielectric laser accelerators

A high-power narrow-linewidth 1018 nm fiber laser based on a single-mode–few-mode–single-mode structure

Comparison of coherent and incoherent laser beam combination for tactical engagements

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