Tunable narrowband terahertz emission from mastered laser–electron beam interaction

Bielawski, S.; Évain, C.; Hara, Toru; Hosaka, Masahito; Katoh, Masahiro; Kimura, S.; Mochihashi, A.; Shimada, Miho; Szwaj, C.; Takahashi, Toshiharu; Takashima, Y.

doi:10.1038/nphys916

Cited by 104 publications

(65 citation statements)

References 22 publications

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“…Beams with density modulations at sub-mm wavelengths may be used to resonantly excite wake fields for advanced accelerators (Kumar et al, 2010;Muggli et al, 2008), and for the generation of narrow-band THz radiation (Bielawski et al, 2008;Shen et al, 2011)). Analysis shows that in addition to creating fine structures in the beam density distribution for the generation of fully coherent radiation at shorter wavelengths, the EEHG technique may also be used to produce long-scale density modulations (with modulation periods much longer than the laser wavelengths).…”

Section: Creating Long-scale Structures For Narrow-band Terahertz mentioning

confidence: 99%

Beam by design: Laser manipulation of electrons in modern accelerators

et al. 2014

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Accelerator-based light sources such as storage rings and free-electron lasers use relativistic electron beams to produce intense radiation over a wide spectral range for fundamental research in physics, chemistry, materials science, biology and medicine. More than a dozen such sources operate worldwide, and new sources are being built to deliver radiation that meets with the ever increasing sophistication and depth of new research. Even so, conventional accelerator techniques often cannot keep pace with new demands and, thus, new approaches continue to emerge. In this article, we review a variety of recently developed and promising techniques that rely on lasers to manipulate and rearrange the electron distribution in order to tailor the properties of the radiation. Basic theories of electron-laser interactions, techniques to create micro-and nano-structures in electron beams, and techniques to produce radiation with customizable waveforms are reviewed. We overview laser-based techniques for the generation of fully coherent x-rays, mode-locked x-ray pulse trains, light with orbital angular momentum, and attosecond or even zeptosecond long coherent pulses in free-electron lasers. Several methods to generate femtosecond pulses in storage rings are also discussed. Additionally, we describe various schemes designed to enhance the performance of light sources through precision beam preparation including beam conditioning, laser heating, emittance exchange, and various laser-based diagnostics. Together these techniques represent a new emerging concept of "beam by design" in modern accelerators, which is the primary focus of this article CONTENTS

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Section: Creating Long-scale Structures For Narrow-band Terahertz mentioning

confidence: 99%

Beam by design: Laser manipulation of electrons in modern accelerators

et al. 2014

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“…[206][207][208] Quasi-monochromatic CSR was also obtained owing to the periodic modulation of electron bunches created by an amplitude-modulated laser pulse at UVSOR-II. 209,210) In addition, a new type of accelerator, the energy recovery linac (ERL), can generate intense CSR in the THz region, whose average power is 10 4 to 10 6 times higher than that of normal SR. 211) Since CSR is a broadband source, a wide range of applications can be expected. For example, CSR has been used to study the Josephson plasma in high-T c cuprates 212) and the superconducting gap in boron-doped diamond.…”

Section: Ir Magneto-optical Imaging On Euomentioning

confidence: 99%

Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions

Kimura

Okamura

2013

J. Phys. Soc. Jpn.

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Owing to its high brilliance, infrared and terahertz synchrotron radiation (IR/THz-SR) has emerged as a powerful tool for spectroscopy under extreme (i.e., technically more difficult) experimental conditions such as high pressure, high magnetic field, high spatial resolution, and a combination of these. The methodologies for pressure-and magneticfield-dependent spectroscopy and microscopy using IR/THz-SR have advanced rapidly worldwide. By applying them to strongly correlated electron systems (SCESs), many experimental studies have been performed on their electronic structures and phonon/molecular vibration modes under extreme conditions. Here, we review the recent progress of methodologies of IR/THz-SR spectroscopy and microscopy, and the experimental results on SCESs and other systems obtained under extreme conditions.

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“…THz imaging) that require (or could benefit from) a powerful narrow-band THz radiation. The second category typically aims to provide such kinds of narrow-band THz radiation using bunched electron beam with a density modulation repeated at THz frequency [9,10]. One method is to use a train of laser pulses to illuminate the photocathode to generate a train of electron beams repeated at THz frequency and the bunch trains can be used to generate narrow-band THz radiation when they are accelerated to relativistic energy [10].…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. [9] a laser is first shaped to have a quasisinusoidal envelope at THz frequency and then used to generate energy modulation in the relativistic electron beam. After passing through a dispersion section, the energy modulation is converted to density modulation.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced tunable narrow-band THz emission from laser-modulated electron beams

Xiang

Stupakov

2009

Phys. Rev. ST Accel. Beams

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We propose and analyze a scheme to generate enhanced narrow-band terahertz (THz) radiation through down-conversion of the frequency of optical lasers using laser-modulated electron beams. In the scheme the electron beam is first energy modulated by two lasers with wave numbers k 1 and k 2 , respectively. After passing through a dispersion section, the energy modulation is converted to density modulation. Because of the nonlinear conversion process, the beam will have density modulation at wave number k ¼ nk 1 þ mk 2 , where n and m are positive or negative integers. By properly choosing the parameters for the lasers and dispersion section, one can generate density modulation at THz frequency in the beam using optical lasers. This density-modulated beam can be used to generate powerful narrow-band THz radiation. Since the THz radiation is in tight synchronization with the lasers, it should provide a high temporal resolution for the optical-pump THz-probe experiments. The central frequency of the THz radiation can be easily tuned by varying the wavelength of the two lasers and the energy chirp of the electron beam. The proposed scheme is in principle able to generate intense narrow-band THz radiation covering the whole THz range and offers a promising way towards the tunable intense narrow-band THz sources.

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Tunable narrowband terahertz emission from mastered laser–electron beam interaction

Cited by 104 publications

References 22 publications

Beam by design: Laser manipulation of electrons in modern accelerators

Beam by design: Laser manipulation of electrons in modern accelerators

Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions

Enhanced tunable narrow-band THz emission from laser-modulated electron beams

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