Generation of 110 W infrared and 65 W green power from a 13-GHz sub-picosecond fiber amplifier

Zhao, Zhi; Dunham, Bruce; Bazarov, Ivan; Wise, Frank W.

doi:10.1364/oe.20.004850

Cited by 21 publications

(14 citation statements)

References 18 publications

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“…For all direct phase space and longitudinal profile data taken with our Emittance Measurement System (EMS), we exclusively used a 50 MHz laser to limit the beam power deposited into the interceptive EMS diagnostics. This laser system produces 520 nm, 1 ps rms pulses with comparable pulse energy to the primary 1.3 GHz laser used for full repetition rate experiments [19]. Four rotatable birefringent crystals temporally shape the primary pulses by splitting each into 16 copies with tunable relative intensities set by the crystal rotation angles.…”

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confidence: 99%

Demonstration of cathode emittance dominated high bunch charge beams in a DC gun-based photoinjector

Gulliford

Bartnik

Bazarov

et al. 2015

Applied Physics Letters

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We present the results of transverse emittance and longitudinal current profile measurements of high bunch charge (≥100 pC) beams produced in the DC gun-based Cornell Energy Recovery Linac Photoinjector. In particular, we show that the cathode thermal and core beam emittances dominate the final 95% and core emittance measured at 9-9.5 MeV. Additionally, we demonstrate excellent agreement between optimized 3D space charge simulations and measurement, and show that the quality of the transverse laser distribution limits the optimal simulated and measured emittances. These results, previously thought achievable only with RF guns, demonstrate that DC gun based photoinjectors are capable of delivering beams with sufficient single bunch charge and beam quality suitable for many current and next generation accelerator projects such as Energy Recovery Linacs (ERLs) and Free Electron Lasers (FELs).Linear electron accelerators boast a wide range of current and planned applications in the physical sciences. Examples include: x-ray sources [1-3], electron-ion coolers [4], Ultra-fast Electron Diffraction (UED) experiments [5][6][7][8], and fixed-target nuclear physics experiments [9]. A key feature of many of these applications is the potential to produce beams where the initial beam quality, set by the source, dominates the final beam quality at the usage point. This has lead to the design of a next generation of machines, such as high energy Energy Recovery Linacs (ERLs) [2], and Free Electron Lasers (FELs) [3] which could provide diffraction limited hard x-rays with orders of magnitude brighter beams than modern storage rings. The successful design and implementation of such machines has the potential to impact an impressively broad range of research in physics, chemistry, biology, and engineering.For next generation high energy x-ray sources like the proposed Linac Coherent Light Source-II (LCLS-II) [10], the creation (at MHz repetition rates) and effective transport of multi-MeV beams with high bunch charges (≥100 pC), picosecond bunch lengths, and sub-micron normalized transverse emittances represents a beam dynamics regime previously thought attainable only with RF gun based photoinjectors [11]. In this letter, we challenge this assumption, and show that the DC gun-based Cornell ERL injector can produce cathode emittance dominated beams which meet the bunch charge, emittance, and peak current specifications of a next generation light source. In doing so, we also demonstrate excellent agreement between measurement and simulation of the injector, and show that ultimate optimization of the emittance in high-brightness photoinjectors may require advanced transverse laser shaping along with the use of low intrinsic emittance photocathodes.Before discussing our experimental results, we review the definitions of the key figures of merit for beam quality in high-brightness accelerators relevant for this work: emittance and brightness. For the beam densities encountered in this work (10 17 -10 18 e/m 3 ), classical relativisti...

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confidence: 99%

Demonstration of cathode emittance dominated high bunch charge beams in a DC gun-based photoinjector

Gulliford

Bartnik

Bazarov

et al. 2015

Applied Physics Letters

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“…Fiber lasers are an excellent choice as they can deliver high average power with high slope efficiency and diffraction-limited beam quality [4,5]. High-power pump light can be efficiently coupled into the large-mode area, double-clad gain fibers, delivering IR ps pulses with more than 100 W average power [6][7][8][9][10][11][12][13][14][15], and green ps pulses through second harmonic generation (SHG) [10][11][12]15]. Also, the diffraction-limited beam quality can be reliably maintained in the very high-power regime due to the outstanding thermo-optical properties and the waveguide structure in the double-clad fibers.…”

Section: Introductionmentioning

confidence: 99%

“…Above a certain power level, the peak power in the fiber core becomes very high, and the nonlinear phase shift accumulated in the amplifier becomes significant, broadening the optical spectrum due to the self-phase modulation (SPM) and even distorting the temporal profile. One way to curb the nonlinear effect in the amplifier is to modestly chirp the input pulses and thus reduce the peak power in the fiber core [12]. By this means, the nonlinear effect can be efficiently removed, and the amplified pulses then de-chirped through a pair of gratings.…”

Section: Introductionmentioning

confidence: 99%

Generation of 167 W infrared and 124 W green power from a 13-GHz, 1-ps rod fiber amplifier

2014

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We report on the direct amplification of 1-ps pulses at 1.3 GHz repetition rate by using a large mode area rod fiber amplifier. An average power of 167 W at 1040 nm with nearly transform-limited duration is generated and converted into 124 W average green power through second harmonic generation. Both infrared and green pulses exhibit diffraction-limited beam quality. A frequency doubling efficiency of 75% and a pump-to-green efficiency of 45% have been achieved, which are to our knowledge the highest reported for fiber laser systems.

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“…Sub-picosecond pulsed fiber amplifier systems have reached output powers of 830 W at a 78 MHz repetition rate with a 640 fs pulse duration using a chirped pulse amplification architecture [13]. More recently a fiber master oscillator power amplifier (MOPA) system has achieved 110 W at a 1.3 GHz repetition rate with a 890 fs pulse duration requiring only modest pulse stretching [14]. As the repetition rate increases, the pulse energy decreases and the linear amplification regime can be used to correspondingly higher average powers before pulse stretching becomes neccessary.…”

Section: Introductionmentioning

confidence: 99%

Supercontinuum Generation With GHz Repetition Rate Femtosecond-Pulse Fiber-Amplified VECSELs

Head

Chan

Feehan

et al. 2013

IEEE Photon. Technol. Lett.

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Abstract-We report supercontinuum generation using a mode-locked VECSEL emitting 400-fs pulses at a 3-GHz repetition rate, amplified with a cascaded ytterbium-doped fiber amplifier system up to 40 W of average power. The pulses were then recompressed to their original duration via a high throughput transmission grating compressor, and used to generate supercontinuum in two samples of photonic crystal fiber (PCF); an all-normal dispersion PCF, and a PCF with a zero dispersion wavelength of 1040 nm, creating 20 dB spectral bandwidths of 200 nm and 280 nm respectively.

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Generation of 110 W infrared and 65 W green power from a 13-GHz sub-picosecond fiber amplifier

Cited by 21 publications

References 18 publications

Demonstration of cathode emittance dominated high bunch charge beams in a DC gun-based photoinjector

Demonstration of cathode emittance dominated high bunch charge beams in a DC gun-based photoinjector

Generation of 167 W infrared and 124 W green power from a 13-GHz, 1-ps rod fiber amplifier

Supercontinuum Generation With GHz Repetition Rate Femtosecond-Pulse Fiber-Amplified VECSELs

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