Dependence on chirp rate and spectral resolution of the terahertz field pulse waveform measured by electro-optic detection using a chirped optical pulse and a spectrometer and its effect on terahertz spectroscopy

Murakami, Hiroshi; Shimizu, Kohei; Katsurada, M.; Nashima, Shigeki

doi:10.1063/1.3021151

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…These nulls limit the temporal resolution and the loss of signal at or near the null frequencies cannot be reversed by deconvolution (i.e., to retrieve the input field E ( t ) from the recorded data). This theoretical result on the existence of nulls is consistent with previous experimental observations 29 , 30 , and ours, as we will see below. Conceptually, these nulls correspond to the dispersion penalty phenomenon observed in the photonic time-stretch digitizer 21 , as shown in Supplementary Material, Sections VB and VIA .…”

Section: Resultssupporting

confidence: 93%

Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording

et al. 2022

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Recording electric field evolution in single-shot with THz bandwidth is needed in science including spectroscopy, plasmas, biology, chemistry, Free-Electron Lasers, accelerators, and material inspection. However, the potential application range depends on the possibility to achieve sub-picosecond resolution over a long time window, which is a largely open problem for single-shot techniques. To solve this problem, we present a new conceptual approach for the so-called spectral decoding technique, where a chirped laser pulse interacts with a THz signal in a Pockels crystal, and is analyzed using a grating optical spectrum analyzer. By borrowing mathematical concepts from photonic time stretch theory and radio-frequency communication, we deduce a novel dual-output electro-optic sampling system, for which the input THz signal can be numerically retrieved—with unprecedented resolution—using the so-called phase diversity technique. We show numerically and experimentally that this approach enables the recording of THz waveforms in single-shot over much longer durations and/or higher bandwidth than previous spectral decoding techniques. We present and test the proposed DEOS (Diversity Electro-Optic Sampling) design for recording 1.5 THz bandwidth THz pulses, over 20 ps duration, in single-shot. Then we demonstrate the potential of DEOS in accelerator physics by recording, in two successive shots, the shape of 200 fs RMS relativistic electron bunches at European X-FEL, over 10 ps recording windows. The designs presented here can be used directly for accelerator diagnostics, characterization of THz sources, and single-shot Time-Domain Spectroscopy.

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Section: Resultssupporting

confidence: 93%

Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording

et al. 2022

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“…This explains why it is impossible to perform a deconvolution (i.e., to retrieve the input field E(t) from the recorded data) using a single channel Y 1 (t) or Y 2 (t), for broadband signals. This theoretical result on the existence of zeros is consistent with previous experimental observations [30,31], and ours, as we will see below. Conceptually, these nulls correspond to the dispersion penalty phenomenon which is observed in the photonic time-stretch digitizer [23], as shown in Supplementary Material, Sections IVC and VB.…”

Section: Deos Single-shot Recorder: Experimental Strategy and Novel T...supporting

confidence: 93%

Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording

Roussel,

Szwaj,

Steffen

et al. 2020

Preprint

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THz spectroscopy is an emerging tool for detection of microorganisms and harmful compounds in the food industry, the study of proteins in biomedicine and the development of electronbeam X-ray sources for molecular imaging and lithography. Recording of THz electric field evolution in single-shot is crucially needed in terahertz spectroscopy of irreversible processes in such applications as well as for data communication in the THz portion of the spectrum where there is an abundance of untapped bandwidth. However, achieving sub-picosecond resolution over a long time window has been an open problem for electro-optic sampling -the standard technique for recording terahertz waveforms. We introduce a new conceptual framework for this open problem that is inspired by timestretch theory. The novel framework unveils a solution to this 20 year-old problem leading to a dramatic enhancement of the achievable temporal resolution. We validate this new technology in two applications. First, we present single shot recordings of long free-propagating terahertz transients with record time resolution. Second, we present recordings of ultra-short relativistic electron bunches at the European X-ray Free Electron Laser. These results show that electric signals may be now recorded with terahertz bandwidth over arbitrarily long windows, thus enabling the realization of single-shot terahertz oscilloscopes and single-shot time-domain spectroscopy systems with an arbitrary timebandwidth product.

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“…Some single-shot techniques have been already proposed, and each of these has advantages and disadvantages for measurements. Optical chirped pulse detection enables the singleshot detection by mapping temporal information onto each frequency spectrum, [11][12][13][14][15] although the time-resolution was formerly limited by the spectral resolution. Recently, the disadvantage was overcome by using sufficiently short pulsed laser, or by resolving and analyzing the interference fringes using a spectrometer with sufficiently high spectral resolution, which is successfully applied to pulse shape monitoring of the electron bunch, for example in Refs.…”

mentioning

confidence: 99%

Single-shot measurement of a terahertz electric-field waveform using a reflective echelon mirror

Minami

Hayashi

Takeda

et al. 2013

Applied Physics Letters

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Single-shot measurements of terahertz (THz) electric-field waveforms are demonstrated using a reflective echelon mirror, which produces multiple probe pulses with different time-delays. The polarization rotation of the probe pulses, due to the electro-optic effect induced by the THz electric field generated from grating-coupled LiNbO 3 , was imaged onto a two-dimensional complementary metal-oxide-semiconductor camera. A waveform with a weak peak field strength of 0.6 kV/cm was obtained with a good signal-to-noise ratio, demonstrating precise single-shot detection of the THz electric field waveform. V

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Dependence on chirp rate and spectral resolution of the terahertz field pulse waveform measured by electro-optic detection using a chirped optical pulse and a spectrometer and its effect on terahertz spectroscopy

Cited by 6 publications

References 23 publications

Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording

Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording

Phase Diversity Electro-optic Sampling: A new approach to single-shot terahertz waveform recording

Single-shot measurement of a terahertz electric-field waveform using a reflective echelon mirror

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