A small lamellar grating interferometer for the very far-infrared

Milward, R. C.

doi:10.1016/0020-0891(69)90012-8

Cited by 29 publications

(3 citation statements)

References 21 publications

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“…Figure 1 shows the schematic setup of the interferometer, and figure 2 is a photograph of the instrument. Two 90 • off-axis parabolic mirrors guide the THz beams and no other optical guiding elements, such as light pipes [8,9,11] or flat mirrors [5][6][7], are needed. The source under test is positioned at the focus of the input parabolic mirror.…”

Section: Instrument Configurationmentioning

confidence: 99%

“…Without a beam splitter, there is no power reflected back into the source under test. Different types of far-infrared interferometers using lamellar mirrors [5][6][7] were reported previously and their basic theory of operation was covered in [8][9][10]. These instruments were designed for FIR transmission spectroscopy and employed black-body sources or, in one case, synchrotron radiation [11] described here uses a greatly simplified configuration and was designed specifically for source characterization and operation at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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A simple interferometer for the characterization of sources at terahertz frequencies

Eisele¹,

Naftaly²,

Fletcher³

2007

Meas. Sci. Technol.

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The design and performance of a simple and compact far-infrared Fourier-transform spectrometer for the characterization of sources is described. The spectrometer works as a Michelson interferometer without a beam splitter and employs a Golay cell or a pyroelectric detector. A pair of flat lamellar mirrors with a computer-controlled displacement introduces a precisely defined phase difference between two parallel beams of nearly equal radiated power. The interferometer is intended for operation at frequencies between 0.1 and 3 THz with a frequency resolution of 6 GHz, and is used to characterize both continuous-wave and pulsed sources.

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Section: Instrument Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A simple interferometer for the characterization of sources at terahertz frequencies

Eisele¹,

Naftaly²,

Fletcher³

2007

Meas. Sci. Technol.

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“…For a long time the working horse for XUV pump-XUV probe experiments was a double-mirror split-and-delay unit [11][12][13] which impedes phase-resolved measurements due to the nature of its wavefront splitting (see [14][15][16] and Section 2). However, recent successful adaptations of ideas originally invented for far-infrared interferometry [17][18][19][20] to UV [21] and XUV [22] frequencies open new opportunities for phase-resolved (interferometric) experiments at short wavelength FELs with a typical spectral bandwidth of 1%.…”

Section: Introductionmentioning

confidence: 99%

Split-And-Delay Unit for FEL Interferometry in the XUV Spectral Range

et al. 2017

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In this work we present a reflective split-and-delay unit (SDU) developed for interferometric time-resolved experiments utilizing an (extreme ultraviolet) XUV pump-XUV probe scheme with focused free-electron laser beams. The developed SDU overcomes limitations for phase-resolved measurements inherent to conventional two-element split mirrors by a special design using two reflective lamellar gratings. The gratings produce a high-contrast interference signal controlled by the grating displacement in every diffraction order. The orders are separated in the focal plane of the focusing optics, which enables one to avoid phase averaging by spatially selective detection of a single interference state of the two light fields. Interferometry requires a precise relative phase control of the light fields, which presents a challenge at short wavelengths. In our setup the phase delay is determined by an in-vacuum white light interferometer (WLI) that monitors the surface profile of the SDU in real time and thus measures the delay for each laser shot. The precision of the WLI is 1 nm as determined by optical laser interferometry. In the presented experimental geometry it corresponds to a time delay accuracy of 3 as, which enables phase-resolved XUV pump-XUV probe experiments at free-electron laser (FEL) repetition rates up to 60 Hz.

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Ferninfrarot‐Fourier‐Spektroskopie als Methode zur Strukturaufklärung in der Chemie

Knözinger

1976

Angewandte Chemie

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Hinter dem für so manchen verwirrenden Begriff „Fourier‐Spektroskopie”︁ verbirgt sich das Zusammenspiel einer grundlegenden physikalischen Idee, eines einfachen mathematischen Prinzips und moderner Datentechnik. Durch Einführung dieser relativ jungen Methode in die Meßgerätetechnologie haben die Kernresonanz‐ und die Infrarot‐Spektroskopie neue Impulse erhalten. Ganz besonders hat die infrarot‐spektroskopische Untersuchung niederfrequenter Molekülschwingungen davon profitiert; man spricht in diesem Zusammenhang von Ferninfrarot‐(FIR)‐Fourier‐Spektroskopie, die eine Vielfalt interessanter Anwendungsmöglichkeiten in der Organischen, Anorganischen und Physikalischen Chemie erschlossen hat.

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A small lamellar grating interferometer for the very far-infrared

Cited by 29 publications

References 21 publications

A simple interferometer for the characterization of sources at terahertz frequencies

A simple interferometer for the characterization of sources at terahertz frequencies

Split-And-Delay Unit for FEL Interferometry in the XUV Spectral Range

Ferninfrarot‐Fourier‐Spektroskopie als Methode zur Strukturaufklärung in der Chemie

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