Institut National De La Recherche Scientifique

Marco Peccianti

Roberto Morandotti

Alessia Pasquazi

Yoann Jestin

Luca Razzari

Matteo Clerici

José Azana

David James Moss

Anna Mazhorova

Yongwoo Park

Sze Phing Ho

A method and a system for terahertz detection, using at least a first and a second electrodes separated by a centro-symmetric material. The system comprises at least a first and a second electrodes with conductive pads for connection to a voltage source, separated by a centro-symmetric material; the method comprising second harmonic generation in the centro-symmetric material by overlapping of a probe and a terahertz beams.

Fully-coherent terahertz detection method and system

A laser system comprises a high-Q nonlinear optical resonator, a cavity comprising an amplifying element and a dispersive element, an optical delay line adapted to tune the length of the cavity, and a large pass-band filter adapted to tune the cavity's central oscillation wavelength, the nonlinear optical resonator being selected with a linewidth (LW) comparable to the cavity free-spectral range (FSR). There is provided a method for generating highly stable pulse streams, comprising providing a cavity comprising an amplifying element and a dispersive element; selecting a high-Q nonlinear optical resonator with a linewidth (LW) comparable to the cavity free-spectral range (FSR); tuning the length of the cavity; and tuning the cavity's central oscillation wavelength.

Stable mode-locked laser for high repetition rate operation

An interferometric method and system enabling light echoes-to-spectrum mapping, applicable for laser rangefinder, biomedical imaging including surface 3D mapping and tomography, vehicle position identification, and spectrum analysis. The direct mapping into spectrum allows a time-of-flight detection without using any timing pulse modulation. The sensitivity of the detection can be as high as that of the conventional low coherence interferometry, thereby an eye-safe and low-cost solution not compromising performance. In a practical implementation, high accurate range detection can be easily achievable with the level of accuracy equivalent to the laser rangefinder using a 20 ps Full-Width-at-Half-Maximum (FWHM) timing pulse. The system and method comprise applying dispersion-unbalanced interference (referred to as 'cross-chirp interference') and gating a phase matched spectral component. The dispersion unbalance used to induce linear one-to-one correspondence between the relative time delay and the spectral component, the performances in terms of range and resolution of the system and method increase with the increase in dispersion unbalance.

Cross-chirped interferometry system and method for light detection and ranging

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Brighton, United Kingdom

Marco Peccianti