Time domain analysis of coherent terahertz synchrotron radiation

Hübers, Heinz‐Wilhelm; Semenov, Alexey; Holldack, K.; Schade, U.; Wüstefeld, G.; Gol'Tsman, G. N.

doi:10.1063/1.2120896

Cited by 26 publications

(11 citation statements)

References 10 publications

(9 reference statements)

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“…The average power measured with a calibrated Golay detector was ∼4.4 mW. Due to multiple reflections in the beamline the length of a bunch is more than 400 ps [21] and much longer than typical relaxation times in Ge:Ga. A polarizing step scan Fourier transform spectrometer (FTS) was installed at the THz port of the beamline. The FTS has a maximum optical path length difference of 70 mm.…”

Section: Methodsmentioning

confidence: 99%

Long wavelength response of unstressed and stressed Ge:Ga detectors

Hübers

Pavlov

Holldack³

et al. 2006

SPIE Proceedings

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Photoconductivity spectra of unstressed and stressed Ge:Ga detectors were measured. The experiments were performed with a polarizing step scan Fourier transform spectrometer using the synchrotron facility BESSY, which was operated in a dedicated mode with a low momentum compaction factor. By this way powerful and coherent synchrotron radiation below 50 cm -1 was generated. We observed a significant response of unstressed and stressed Ge:Ga detectors below 50 cm -1 and 25 cm -1 , respectively. This response can be attributed to transitions between bound excited states or from bound excited states to the valence band. The results indicate that in germanium detectors a fraction of the recombining holes is captured into bound excited states.

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Section: Methodsmentioning

confidence: 99%

Long wavelength response of unstressed and stressed Ge:Ga detectors

Hübers

Pavlov

Holldack³

et al. 2006

SPIE Proceedings

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“…While the theory-experiment comparison has been made possible by independent knowledge of the Coulomb temporal profile, for future applications we propose the converse, with the measured spectrum used to infer temporal information, as is common in electron bunch diagnostics. [1][2][3][4][5] In a separate experiment, we have verified that the optical fields are produced at opt Ϯ THz , according to Eqs. ͑4͒ and ͑5͒, by observing the upconversion of a quasimonochromatic THz FEL source which, together with a monochromatic optical probe, allows the sum and difference frequency mixing contributions to be observed distinctly.…”

Section: ͑1͒mentioning

confidence: 97%

“…Measurement of the spectrum of this Coulomb pulse can be used to characterize the temporal profile of the bunch. Measuring the spectrum radiated via mechanisms such as coherent transition radiation, 1,2 coherent synchrotron radiation, 3,4 or SmithPurcell radiation 5 poses problems as the radiated spectrum spans the far infrared ͑IR͒ to mid-IR. These techniques thus seek to measure an extremely broadband spectrum, specifically including the long wavelength components, which are subject to strong diffraction limitations, and which are required for reliable temporal profile reconstruction, but which cannot propagate except through near-field diffraction effects.…”

Section: Upconversion Of a Relativistic Coulomb Field Terahertz Pulsementioning

confidence: 99%

Upconversion of a relativistic Coulomb field terahertz pulse to the near infrared

Jamison

Berden

Phillips

et al. 2010

Applied Physics Letters

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We demonstrate the spectral upconversion of a unipolar subpicosecond terahertz (THz) pulse, where the THz pulse is the Coulomb field of a single relativistic electron bunch. The upconversion to the optical allows remotely located detection of long wavelength and nonpropagating components of the THz spectrum, as required for ultrafast electron bunch diagnostics. The upconversion of quasimonochromatic THz radiation has also been demonstrated, allowing the observation of distinct sum- and difference-frequency mixing components in the spectrum. Polarization dependence of first and second order sidebands at ωopt±ωTHz, and ωopt±2ωTHz, respectively, confirms the χ(2) frequency mixing mechanism.

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“…It is known that a high-peak-current beam in an electron storage ring emits a burst of coherent synchrotron radiation (CSR) in the THz region [1][2][3][4][5][6][7]. Compared with other methods for producing CSR radiation in an electron storage ring, this method supplies higher power and the CSR is easily obtained with no special expense.…”

Section: Introductionmentioning

confidence: 99%