THz pulse generation and single shot detection in a single ZnTe Crystal IRMMW- THz 2022

Single-cycle THz signal of few picoseconds duration, have been simultaneous generated via optical rectification and detected by electro-optic effect in the same ZnTe crystal. An unbalanced seemingly single shot detection scheme was performed to characterize the signal. The added simplicity of this scheme aided the independent analysis of the horizontal and vertical polarization arm of the chirped probe beam to explain the associated nonlinearities in the detected THz signal

Tunable ultra-fast infrared generation in a gas-filled hollow core capillary by a four-wave mixing process: erratum

This erratum reports corrections to the temporal axes in Figs. 12 and 13 of J. Opt. Soc. Am. B 39, 662 (2022)JOBPDE0740-322410.1364/JOSAB.444574

A Proof-of-Concept of a Multiple-Cell Upsets Detection Method for SRAMs in Space Applications

This work details a new way to deal with the Multiple-Cell Upsets (MCU) in SRAM memories for space applications. The method consists of spatially interleaving a memory plan with a network of memory radiation detectors. As a proof-of-concept, a prototype circuit composed of the radiation detectors was manufactured in the 350 nm CMOS Process Technology and tested considering two methodologies: electrically-induced SEU/MCU testing and SEE laser testing. Silicon measurement results confirm the correct operation of the circuit, detecting single and multiple events inserted in different positions of the evaluated detection plans. According to the ratio between the number of data and detection cells, the method proposed can provide a probability of detecting MCUs in a memory plan that can reach close to 100%

Art Painting Testing with Terahertz Pulse and Frequency Modulated Continuous Wave

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IEEE

Remote sensing of lithological changes is of high interest in industrial domains such as geotechnics and mineral exploration. Usually, applied methods are based in acoustics or ground penetrating radars working at HF/VHF frequencies. Their limitations are due to the trade-off between spatial resolution and rock penetration. Currently, frequency modulated continuous wave (FMCW) at frequencies higher than 60 GHz are more accessible and available at reasonable prices. However, their feasibility for measuring lithological changes has not been studied yet. Therefore, in this work we have proposed to make measurements with a 300 GHz FMCW radar to detect the interfaces between two limestone of similar refractive indices. As a result, they were successfully detected even after 2 cm rocks’ penetration

Terahertz frequency modulated continuous wave imaging advanced data processing for art painting analysis

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THz imaging with a hollow core waveguide

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Frequency modulated continuous wave terahertz imaging for art restoration

Art and heritage analysis techniques are important in the framework of restoration and conservation. Usual techniques for painting analysis are X-ray imaging and infrared raking light. We propose in this paper to present a case study of a painting analyzed by conventional methods and by terahertz imaging

Frequency modulated continuous wave terahertz imaging for art restoration

Art and heritage analysis techniques are important in the framework of restoration and conservation. Usual techniques for painting analysis are X-ray imaging and infrared raking light. We propose in this paper to present a case study of a painting analyzed by conventional methods and by terahertz imaging

Tunable ultra-fast infrared generation in a gas-filled hollow core capillary by a four-wave mixing process

International audienceIn this manuscript, we numerically and experimentally investigated the four-wave mixing process in a gas filled hollowcore capillary in the femtosecond regime. The interaction between a visible broad-band continuum and a chirped pump pulse resulted to the generation of a tunable near infrared pulse of 1.2 to 1.5 µm, and with the potentiality to reach the mid-infrared range. Numerical simulations were performed in order to fully understand the role of key parameters such as the gas pressure, chirps and relative delays of the involved pulses. The experimentation which demonstrated and highlighted the feasibility of the tunable femtosecond source, led to the generation of an idler at 1.2 µm with a duration of ~220 fs at the direct output of the capillary. The duration can ultimately be reduced to 45 fs in the presence of phase compensators