Generation of picosecond pulses with variable temporal profiles and linear polarization by coherent pulse stacking in a birefringent crystal shaper

Liu, Fangming; Huang, Senlin; Si, Shangyu; Zhao, Gang; Liu, Kexin; Zhang, Shukui

doi:10.1364/oe.27.001467

Cited by 18 publications

(3 citation statements)

References 24 publications

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“…However, it is also possible to obtain more complicated shapes (e.g., a double triangle) by passing the input laser pulse through a stack of crystals rotated at optimized angles relative to the incident laser pulse. In (Liu et al, 2019;, they used this method to generate a double-triangular laser pulse which was then used in PE cathode gun to generate the corresponding double-triangular electron bunch as shown in Fig. 16.…”

Section: A Frequency Domain Laser Shapingmentioning

confidence: 99%

Bunch Shaping in Electron Linear Accelerators

Ha,

Kim,

Piot

et al. 2021

Preprint

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Modern electron linear accelerators are often designed to produce smooth bunch distributions characterized by their macroscopic ensemble-average moments. However, an increasing number of accelerator applications call for finer control over the beam distribution, e.g., by requiring specific shapes for its projection along one coordinate. Ultimately, the control of the beam distribution at the single-particle level could enable new opportunities in accelerator science. This review discusses the recent progress toward controlling electron beam distributions on the "mesoscopic" scale with an emphasis on shaping the beam or introducing complex correlations required for some applications. This review emphasizes experimental and theoretical developments of electron-bunch shaping methods based on bounded external electromagnetic fields or via interactions with the self-generated velocity and radiation fields. 1. Space-charge field with a single bunch 41 2. Space-charge field with a few bunches 43 3. Space-charge field with multiple bunches: space-charge oscillation 44 4. Space-charge field with multiple bunches: longitudinal cascade amplifier 46 5. Space-charge field with multiple bunches: plasma cascade amplifier 47 B. Shaping profiles using coherent synchrotron radiation 47 C. Shaping profiles using wakefields 49 1. Bunch compression 50 2. Bunch train generation 50 3. Single-bunch profile shaping 51 4. Control over the energy distribution 52 5. Control over longitudinal phase space 53 VI. Coupling between degrees of freedom for phase-space tailoring 54 A. Introduction 54 B. Coupling between the two transverse degrees of freedom 54 1. Producing beams with canonical angular momentum 54 2. Decoupling of CAM-dominated beams and transverse emittance partitioning 55 3. Phase-space exchange between the two transverse planes 57 C. Transverse-to-longitudinal phase-space exchangers 59 1. Emittance exchange 59 2. Current profile shaping 60 3. Bunch compression 62 4. Double phase-space exchangers 62 D. Generalized phase-space repartitioning between the three degrees of freedom 65 1. Flat beam transformation combined with emittance exchange 65 2. Coupling between the longitudinal and transverse phase spaces 65

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Section: A Frequency Domain Laser Shapingmentioning

confidence: 99%

Bunch Shaping in Electron Linear Accelerators

Ha,

Kim,

Piot

et al. 2021

Preprint

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“…Optical pulses with parabolic temporal intensity profiles have gotten much interest for a variety of applications, starting from high-power ultrashort pulse generation to optical nonlinear signal processing [7][8][9][10]. These parabolic pump pulses can be generated with different durations ranging from the sub-picosecond to a few tens of picoseconds by linear or nonlinear pulse shaping techniques [11][12][13] and birefringent filters [14][15]. Since it is well known that parabolic XPM can induce quadratic phase modulation on a probe pulse [16], many works based on XPM have been done in the last three decades in order to eliminate optical pulse degradation [17][18][19], spectral compression [20], and real-time temporal measurement of femtosecond pulses [21].…”

Section: Introductionmentioning

confidence: 99%

Tunable All-Optical System for Time-to-Frequency Mapping by Parabolic Cross-Phase Modulation in the Spectral Fraunhofer Regime

Driouche,

Benkelfat

2023

IEEE Access

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According to the new condition of the pump peak power, we report a developed approach to achieve time-frequency mapping (TFM) in the spectral Fraunhofer regime by a single all-optical time lens using parabolic cross-phase modulation (XPM). The condition is obtained by combining the far-field spectral Fraunhofer regime with the ability of parabolic pump pulses to induce a pure quadratic phase modulation. The derived condition allows the tunability of the mapping by different strategies when probe pulses with different durations are targeted. For design requirements, we show the complete family of bright and dark parabolic pump pulses, which can be implemented depending on the shape of the probe. In order to overcome the limits of the far-field TFM, we demonstrate as a solution the so-called near-field TFM for narrowband mapping. We also discuss potential applications in a variety of fields to provide more insight into the developed approach.INDEX TERMS Spectral Fraunhofer regime, Cross-phase modulation, Time-to-frequency mapping

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“…An advantageous distribution to drive photoinjectors is a transverse and longitudinal flattop in order to homogenize the charge distribution in the electron bunch. With such flattop pulses, low emittances of up to 2 nC bunch charge were demonstrated at the Photo Injector Test Facility at DESY in Zeuthen (PITZ) [4] using the a pulse-stacking technique with birefringent filters [5,6] and a beamshaping aperture (BSA) to generate a laser pulse distribution close to a homogeneously filled cylinder.…”

Section: Introductionmentioning

confidence: 99%

Towards Implementation of 3D Amplitude Shaping at 515 nm and First Pulseshaping Experiments at PITZ

Hoffmann,

Good,

Gross

et al. 2023

Photonics

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A key issue of X-ray free-electron lasers is the quality of the photoelectron beams generated from a photocathode by laser pulses in the high-gradient RF gun. Controlling the shape of these laser pulses can strongly reduce the transverse emittance of the generated electron bunch. For this purpose, a laser pulseshaper at 515 nm is presented that can be used directly with alkali antimonide photocathodes for photoemission. The first results regarding generation and measurement of flattop and parabolic pulses as well as introduction of modulations for THz generation are presented and show the potential for emittance optimization with 3D ellipsoidal pulses with the proposed pulseshaper. The experiments are carried out for Cs2Te photocathodes, which require second harmonic generation of the shaped pulses and thus allow investigation of pulseshape preservation in nonlinear frequency conversion processes.

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Generation of picosecond pulses with variable temporal profiles and linear polarization by coherent pulse stacking in a birefringent crystal shaper

Cited by 18 publications

References 24 publications

Bunch Shaping in Electron Linear Accelerators

Bunch Shaping in Electron Linear Accelerators

Tunable All-Optical System for Time-to-Frequency Mapping by Parabolic Cross-Phase Modulation in the Spectral Fraunhofer Regime

Towards Implementation of 3D Amplitude Shaping at 515 nm and First Pulseshaping Experiments at PITZ

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