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Yu T, Xia H, Xie W, Peng Y. Orbital angular momentum mode detection of the combined vortex beam generated by coherent combining technology. OPTICS EXPRESS 2020; 28:35795-35806. [PMID: 33379688 DOI: 10.1364/oe.409122] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 10/26/2020] [Indexed: 06/12/2023]
Abstract
Coherent beam combining (CBC) technology has distinct advantages in generating high power vortex beam. In this paper, a circularly arranged coherent beam array (CBA) with discrete vortex phases is constructed to generate vortex beams. We demonstrated that the combined vortex beam (CVB) generated by the CBA is a multiplexing vortices optical field, which sidelobe is the coaxial interference pattern of these spiral harmonic components. Using the designed Dammam vortex grating (DVG), the orbital angular momentum (OAM) spectrum of the CVB is detected. Moreover, taking the target OAM mode purity of the CVB as the evaluation function of active phase control system, we realized the closed-loop phase control of the CBA and obtained the phase-locked output of the CVB.
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2
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Miao B, Feder L, Shrock JE, Goffin A, Milchberg HM. Optical Guiding in Meter-Scale Plasma Waveguides. PHYSICAL REVIEW LETTERS 2020; 125:074801. [PMID: 32857573 DOI: 10.1103/physrevlett.125.074801] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 07/05/2020] [Accepted: 07/20/2020] [Indexed: 06/11/2023]
Abstract
We demonstrate a new highly tunable technique for generating meter-scale low density plasma waveguides. Such guides can enable laser-driven electron acceleration to tens of GeV in a single stage. Plasma waveguides are imprinted in hydrogen gas by optical field ionization induced by two time-separated Bessel beam pulses: The first pulse, a J_{0} beam, generates the core of the waveguide, while the delayed second pulse, here a J_{8} or J_{16} beam, generates the waveguide cladding, enabling wide control of the guide's density, depth, and mode confinement. We demonstrate guiding of intense laser pulses over hundreds of Rayleigh lengths with on-axis plasma densities as low as N_{e0}∼5×10^{16} cm^{-3}.
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Affiliation(s)
- B Miao
- Institute for Research in Electronics and Applied Physics University of Maryland, College Park, Maryland 20742, USA
| | - L Feder
- Institute for Research in Electronics and Applied Physics University of Maryland, College Park, Maryland 20742, USA
| | - J E Shrock
- Institute for Research in Electronics and Applied Physics University of Maryland, College Park, Maryland 20742, USA
| | - A Goffin
- Institute for Research in Electronics and Applied Physics University of Maryland, College Park, Maryland 20742, USA
| | - H M Milchberg
- Institute for Research in Electronics and Applied Physics University of Maryland, College Park, Maryland 20742, USA
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Goutsoulas M, Bongiovanni D, Li D, Chen Z, Efremidis NK. Tunable self-similar Bessel-like beams of arbitrary order. OPTICS LETTERS 2020; 45:1830-1833. [PMID: 32236010 DOI: 10.1364/ol.387115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Accepted: 02/17/2020] [Indexed: 06/11/2023]
Abstract
We predict that Bessel-like beams of arbitrary integer order can exhibit a tunable self-similar behavior (that take an invariant form under suitable stretching transformations). Specifically, by engineering the amplitude and the phase on the input plane in real space, we show that it is possible to generate higher-order vortex Bessel-like beams with fully controllable radius of the hollow core and maximum intensity during propagation. In addition, using a similar approach, we show that it is also possible to generate zeroth-order Bessel-like beams with controllable beam width and maximum intensity. Our numerical results are in excellent agreement with our theoretical predictions.
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Gessner S, Adli E, Allen JM, An W, Clarke CI, Clayton CE, Corde S, Delahaye JP, Frederico J, Green SZ, Hast C, Hogan MJ, Joshi C, Lindstrøm CA, Lipkowitz N, Litos M, Lu W, Marsh KA, Mori WB, O'Shea B, Vafaei-Najafabadi N, Walz D, Yakimenko V, Yocky G. Demonstration of a positron beam-driven hollow channel plasma wakefield accelerator. Nat Commun 2016; 7:11785. [PMID: 27250570 PMCID: PMC4895722 DOI: 10.1038/ncomms11785] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 04/27/2016] [Indexed: 11/17/2022] Open
Abstract
Plasma wakefield accelerators have been used to accelerate electron and positron particle beams with gradients that are orders of magnitude larger than those achieved in conventional accelerators. In addition to being accelerated by the plasma wakefield, the beam particles also experience strong transverse forces that may disrupt the beam quality. Hollow plasma channels have been proposed as a technique for generating accelerating fields without transverse forces. Here we demonstrate a method for creating an extended hollow plasma channel and measure the wakefields created by an ultrarelativistic positron beam as it propagates through the channel. The plasma channel is created by directing a high-intensity laser pulse with a spatially modulated profile into lithium vapour, which results in an annular region of ionization. A peak decelerating field of 230 MeV m(-1) is inferred from changes in the beam energy spectrum, in good agreement with theory and particle-in-cell simulations.
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Affiliation(s)
- Spencer Gessner
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Erik Adli
- Department of Physics, University of Oslo, 0316 Oslo, Norway
| | - James M. Allen
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Weiming An
- Department of Electrical Engineering, University of California–Los Angeles, Los Angeles, California 90095, USA
- Department of Physics and Astronomy, University of California–Los Angeles, Los Angeles, California 90095, USA
| | | | - Chris E. Clayton
- Department of Electrical Engineering, University of California–Los Angeles, Los Angeles, California 90095, USA
| | - Sebastien Corde
- LOA, ENSTA ParisTech, CNRS, Ecole Polytechnique, Université Paris-Saclay, 91762 Palaiseau, France
| | - J. P. Delahaye
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Joel Frederico
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Selina Z. Green
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Carsten Hast
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Mark J. Hogan
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Chan Joshi
- Department of Electrical Engineering, University of California–Los Angeles, Los Angeles, California 90095, USA
| | | | - Nate Lipkowitz
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Michael Litos
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Wei Lu
- IFSA Collaborative Innovation Center, Department of Engineering Physics, Tsinghua University, Beijing 100084, China
| | - Kenneth A. Marsh
- Department of Electrical Engineering, University of California–Los Angeles, Los Angeles, California 90095, USA
| | - Warren B. Mori
- Department of Electrical Engineering, University of California–Los Angeles, Los Angeles, California 90095, USA
- Department of Physics and Astronomy, University of California–Los Angeles, Los Angeles, California 90095, USA
| | - Brendan O'Shea
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Navid Vafaei-Najafabadi
- Department of Electrical Engineering, University of California–Los Angeles, Los Angeles, California 90095, USA
| | - Dieter Walz
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Vitaly Yakimenko
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Gerald Yocky
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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Wang BY, Ge XL, Yue QY, Guo CS. Determining the vortex densities of random nondiffracting beams. OPTICS LETTERS 2015; 40:1418-1421. [PMID: 25831347 DOI: 10.1364/ol.40.001418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The evolutionary and statistical properties of the optical vortices that exist in random nondiffracting beams (RNDBs) are analyzed. It is found that the phase singularities (PSs) in the RNDBs originate from the zero rings of Bessel beams with the same ring-shaped spatial spectrum structure (but with zero phase fluctuations) as those of the RNDBs provided. It is also found that the average PS density or vortex density is determined by the average duration of the zero rings of the corresponding Bessel function. According to this model, we successfully derived, for the first time to our knowledge, an analytical formula for quantitatively predicting the PS density of the RNDBs. This formula could be helpful for understanding and designing RNDBs in their applications.
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Fischer P, Brown C, Morris J, López-Mariscal C, Wright E, Sibbett W, Dholakia K. White light propagation invariant beams. OPTICS EXPRESS 2005; 13:6657-6666. [PMID: 19498681 DOI: 10.1364/opex.13.006657] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Propagation invariant light fields such as Bessel light beams are of interest in a variety of current areas such as micromanipulation of atoms and mesoscopic particles, laser plasmas, and the study of optical angular momentum. Considering the optical fields as a superposition of conical waves, we discuss how the coherence properties of light play a key role in their formation. As an example, we show that Bessel beams can be created from temporally incoherent broadband light sources including a halogen bulb. By using a supercontinuum source we elucidate how the beam behaves as a function of bandwidth of the incident light field.
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Fan J, Parra E, Kim KY, Alexeev I, Milchberg HM, Cooley J, Antonsen TM. Resonant self-trapping of high intensity Bessel beams in underdense plasmas. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2002; 65:056408. [PMID: 12059716 DOI: 10.1103/physreve.65.056408] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2001] [Indexed: 05/23/2023]
Abstract
We present a comprehensive report based on recent work [Phys. Rev. Lett. 84, 3085 (2000)] on resonant self-trapping and enhanced absorption of high power Bessel beams in underdense plasmas. The trapping resonance is strongly dependent on initial gas pressure, Bessel-beam geometry, and laser wavelength. Analytic estimates, and simulations using a one-dimensional Bessel-beam-plasma interaction code consistently explain the experimental observations. These results are for longer, moderate intensity pulses where the self-trapping channel is induced by laser-heated plasma thermal pressure. To explore the extension of this effect to ultrashort, intense pulsed Bessel beams, we perform propagation simulations using the code WAKE [Phys. Rev. E 53, R2068 (1996)]. We find that self-trapping can occur as a result of a plasma refractive index channel induced by the combined effects of relativistic motion of electrons and their ponderomotive expulsion.
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Affiliation(s)
- J Fan
- Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA
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Alexeev I, Kim KY, Milchberg HM. Measurement of the superluminal group velocity of an ultrashort Bessel beam pulse. PHYSICAL REVIEW LETTERS 2002; 88:073901. [PMID: 11863896 DOI: 10.1103/physrevlett.88.073901] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2001] [Indexed: 05/23/2023]
Abstract
The superluminal group velocity of an ultrashort optical Bessel beam pulse is measured over its entire depth of field, corresponding to approximately 2x10(4) optical wavelengths. The method used is to measure the traveling ionization front induced by the pulse.
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Affiliation(s)
- I Alexeev
- Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA
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Bobrova NA, Esaulov AA, Sakai JI, Sasorov PV, Spence DJ, Butler A, Hooker SM, Bulanov SV. Simulations of a hydrogen-filled capillary discharge waveguide. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2002; 65:016407. [PMID: 11800790 DOI: 10.1103/physreve.65.016407] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2001] [Indexed: 05/23/2023]
Abstract
A one-dimensional dissipative magnetohydrodynamics code is used to investigate the discharge dynamics of a waveguide for high-intensity laser pulses: the gas-filled capillary discharge waveguide. Simulations are performed for the conditions of a recent experimental measurement of the electron density profile in hydrogen-filled capillaries [D. J. Spence et al., Phys. Rev. E 63, 015401 (R) (2001)], and are found to be in good agreement with those results. The evolution of the discharge in this device is found to be substantially different to that found in Z-pinch capillary discharges, owing to the fact that the plasma pressure is always much higher than the magnetic pressure. Three stages of the capillary discharge are identified. During the last of these the distribution of plasma inside the capillary is determined by the balance between ohmic heating, and cooling due to electron heat conduction. A simple analytical model of the discharge during the final stage is presented, and shown to be in good agreement with the magnetohydrodynamic simulations.
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Affiliation(s)
- N A Bobrova
- Institute for Theoretical and Experimental Physics, Bol'shaya Cheremushkinskaya Street 25, 117259 Moscow, Russia
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