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QuEnG Seminar || Innovation : Ultra-wideband RF spectral analyzer based on spectral hole-burning in Tm:YAG crystal : from lab experiment to field demonstration

on the February 14, 2020

At 11:00am
As part of the next QuEnG Seminar || Innovation, we are pleased to welcome Perrine Berger, Thales Research Technology (Palaiseau)
Abstract

Quantum technologies can contribute to electromagnetic spectrum dominance through the use of SHB (spectral hole burning) based spectral holography in a 3K cooled rare earth doped crystal.

We perform on an out-of-lab demonstration of a multi-gigahertz bandwidth radio-frequency (RF) spectrum analyzer based on spectral hole burning in a 3 K-cooled Thulium3+ doped YAG crystal.

We implemented the so-called "rainbow" architecture, in which optically carried RF spectral components of the incoming signal experience a giant angular dispersion (6 rad/nm) within the crystal. This huge dispersion is obtained by storing a spectro-spatial pattern in the Zeeman sub-levels of ground state 3H6 of Tm :YAG with two periodically frequency-swept and angularly scanned laser beams. The microwave bandwidth of interest being then spread over more than 200 milliradians, it can be imaged and acquired with a high-speed pixelated photo-detector. With this setup, we have been able to monitor and record the spectrum of complex microwave signals over an instantaneous bandwidth of 40 GHz, with a time resolution in the µs range, an adaptable frequency resolution down to MHz, over a large multi-signal dynamic range. The analysis is continuous, leading to a 100% probability of intercept of short/pulsed RF signals, and to almost no latency. This architecture does not require high dynamic range RF analog-to-digital conversion, neither high throughout power spectral density computations, that are the main bottlenecks in standard ultra-wideband spectral analysis techniques. Optical techniques (laser frequency sweeps and stabilities, opto-mechanics) have been handled in order to perform real field tests.

ACCESS:
If you don't usually have acces to the Institut Néel main site (CNRS campus, Presqu'île) send an email to Thierry Chanelière before 10:00am on 14th of February so that your entry passes can be sent to you.


Published on February 10, 2020

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Centre National de la Recherche Scientifique (CNRS)
Room K223, Remy Lemaire 
25 Avenue des Martyrs, 38000 Grenoble