Pyroelectric detection of submicrosecond laser pulses between 230 and 530 μm

Zhu, Wen‐Zhang; Izatt, Jerald R.; Deka, B. K.

doi:10.1364/ao.28.003647

Cited by 16 publications

(4 citation statements)

References 9 publications

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“…The question of the wavelength responsivity of pyroelectric detectors is more difficult to answer. There has been some experimental evidence from detectors that were similar but not identical to ours, that in the wavelength region 200-500 m, the responsivity exhibits interferencelike fringes and may vary by as much as a factor of 5 [22]. Since the mechanism proposed by the authors of [22] (multiple reflections on the crystal surfaces) depends critically on material thickness, electrode conductivity, etc., it is impossible to extrapolate reliably to our detectors and our wavelength region.…”

Section: B Correction Factorssupporting

confidence: 69%

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Longitudinal electron bunch profile diagnostics at 45 MeV using coherent Smith-Purcell radiation

Doucas

Blackmore

Ottewell

et al. 2006

Phys. Rev. ST Accel. Beams

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We have used coherent Smith-Purcell radiation in order to investigate the longitudinal (temporal) profile of the electron bunch at the FELIX facility. Detection of the far-infrared radiation was achieved by a simple and compact experimental arrangement, consisting of an array of 11 room-temperature pyroelectric detectors. Accurate determination of the background radiation, use of high quality optical filters, and an efficient light collection system are essential for this type of experiment. The radiated power is in good agreement with the predictions of the surface current description of this process. It is concluded that 90% of the bunch particles are contained within 5.5 ps, with a temporal profile that could be approximately triangular in shape.

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Section: B Correction Factorssupporting

confidence: 69%

“…A purely empirical extrapolation of the data of Ref. [22] to the wavelength region 500-2500 m suggests that the intensity variations in the interference fringes may have decreased to about 20% of the average value. This uncertainty will appear as an increase in the systematic error.…”

Section: B Correction Factorsmentioning

confidence: 87%

Longitudinal electron bunch profile diagnostics at 45 MeV using coherent Smith-Purcell radiation

Doucas

Blackmore

Ottewell

et al. 2006

Phys. Rev. ST Accel. Beams

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show abstract

“…This is a complicated task, especially in the far infrared, where absolute measurements are notoriously difficult and the availability of suitable sources is very limited. It should also be noted that, although pyroelectric detectors are supposed to have a flat spectral response, there have been reports in the literature that this may not be true [38]. The ideal solution to this problem would be a calibration of each detector against a Golay cell, taken over as many discreet wavelengths as possible, in the wavelength region of interest (0.5-2.6 mm); this statement assumes, of course, that the Golay cell itself has a flat spectral response.…”

Section: A Transmission Factorsmentioning

confidence: 99%

First measurements of the longitudinal bunch profile of a 28.5 GeV beam using coherent Smith-Purcell radiation

Blackmore

Doucas

Perry

et al. 2009

Phys. Rev. ST Accel. Beams

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Coherent Smith-Purcell (SP) radiation originating from three different gratings has been measured at End Station A, SLAC, and has been used to reconstruct the time profile of the electron bunches. The beam energy during these experiments was 28.5 GeV ( ffi 55 773) and the number of electrons in the bunch was 0:9-1:4 Â 10 10 . The spectral distribution of the radiated energy was measured by means of an array of 11 pyroelectric detectors. Typical values of the FWHM of the bunch length are about 2.5 ps, but sharper peaks with FWHM less than 2.0 ps have also been observed. The longitudinal profile also varies with accelerator conditions and can best be approximated by a superposition of 3-4 Gaussian curves. Some typical profiles are presented, together with a discussion of the limitations and strengths of coherent SP radiation as a diagnostic tool. It is concluded that SP radiation offers excellent prospects in this respect, not only in the picosecond range, but potentially in the femtosecond range as well.

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“…Characterization of the pyroelectric transducers in the far-infrared and terahertz regions is usually performed by measuring the broadband response of the detector to blackbody radiation of a Fourier transform infrared spectrometer (FTIR) source [27,28]. The use of monochromatic radiation is usually limited to HeNe or CO 2 lasers [29] with a few exceptions [30], since similar radiation sources in the THz region are not common [31,32]. There is also a lack of direct comparisons of different sensors made under identical or at least similar experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Single Crystal and Polymeric Pyroelectric Detectors in the 0.9–2.0 THz Range Using Monochromatic Laser Radiation of the NovoFEL

Melnikov,

Kalneus,

Getmanov

et al. 2023

Polymers

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The development of efficient and reliable sensors operating at room temperature is essential to advance the application of terahertz (THz) science and technology. Pyroelectric THz detectors are among the best candidates, taking into account their variety, outstanding performance, ease of fabrication, and robustness. In this work, we compare the performance of six different detectors, based on either LaTiO3 crystal or different polymeric films, using monochromatic radiation of the Novosibirsk Free Electron Laser facility (NovoFEL) in the frequency range of 0.9–2.0 THz. The main characteristics, including noise equivalent power and frequency response, were determined for all of them. Possible reasons for the differences in the obtained characteristics are discussed on the basis of the main physicochemical characteristics and optical properties of the sensitive area. At least three detectors showed sufficient sensitivity to monitor the shape and duration of the THz macropulses utilizing only a small fraction of the THz radiation from the primary beam. This capability is crucial for accurate characterization of THz radiation during the main experiment at various specialized endstations at synchrotrons and free electron lasers. As an example of such characterization, the typical stability of the average NovoFEL radiation power at the beamline of the electron paramagnetic resonance endstation was investigated.

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Pyroelectric detection of submicrosecond laser pulses between 230 and 530 μm

Cited by 16 publications

References 9 publications

Longitudinal electron bunch profile diagnostics at 45 MeV using coherent Smith-Purcell radiation

Longitudinal electron bunch profile diagnostics at 45 MeV using coherent Smith-Purcell radiation

First measurements of the longitudinal bunch profile of a 28.5 GeV beam using coherent Smith-Purcell radiation

Comparative Study of Single Crystal and Polymeric Pyroelectric Detectors in the 0.9–2.0 THz Range Using Monochromatic Laser Radiation of the NovoFEL

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