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Aside from quantum optomechanics, this so-called piezospectroscopic effect offers interesting applications as a sensi- * email@example.com tive strain probe in bulk materials   [16 ...arXiv:2109.06577v1 fatcat:l4bynekbazd2fexxqvgjmvf26i
Ultrasound-modulated optical tomography (UOT) is an imaging technique that couples light and ultrasound in order to perform in-depth imaging of highly scattering media. In previous work, we introduced plane wave UOT, an imaging method analogous to x-ray tomography based on the filtered backprojection for image reconstruction. Angle-limited measurements, however, led to drastic loss of lateral spatial resolution. Here, we present a new structured ultrasonic plane wave UOT method that allowsdoi:10.1364/ao.58.001933 fatcat:gtuae7eobjetdd5lorkbzguxxm
more »... al recovery of the resolution. For image reconstruction, we present a generalization of the Fourier slice theorem along with a generalized filtered backprojection formalism. The method is successfully tested on simulated and experimental data.
Cryogenics is a pivotal aspect in the development of quantum technologies. Closed-cycle devices have recently emerged as an environmentally friendly and low-maintenance alternative to liquid helium cryostats. Yet the larger level of vibrations in dry cryocoolers forbids their use in most sensitive applications. In a recent work, we have proposed an inertial, broadband, contactless sensor based on the piezospectroscopic effect, ie the natural sensitivity of optical lines to strain exhibited byarXiv:2112.03713v2 fatcat:m6ebpuxa2fb4he7w3jfkaoztom
more »... purities in solids. This sensor builds on the exceptional spectroscopic properties of rare earth ions and operates below 4K, where spectral hole burning considerably enhances the sensitivity. In this paper, we investigate the fundamental and technical limitations of this vibration sensor by comparing a rigid sample attachment to cold stage of a pulse-tube cryocooler and a custom-designed exchange gas chamber for acoustic isolation.
We implement the ROSE protocol in an erbium doped solid, compatible with the telecom range. The ROSE scheme is an adaptation of the standard 2-pulse photon echo to make it suitable for a quantum memory. We observe an efficiency of 40% in a forward direction by using specific orientations of the light polarizations, magnetic field and crystal axes.doi:10.1364/ol.39.002711 pmid:24784084 fatcat:ggr4n6zaazfrjcjuoin7zkj6x4
We use a quantum non-demolition measurement to generate a spin squeezed state and to create entanglement in a cloud of 10^5 cold cesium atoms, and for the first time operate an atomic clock improved by spin squeezing beyond the projection noise limit in a proof-of-principle experiment. For a clock-interrogation time of 10 \mu\s the experiments show an improvement of 1.1 dB in the signal-to-noise ratio, compared to the atomic projection noise limit.doi:10.1088/1367-2630/12/6/065032 fatcat:55s2xgm4irc5xdtor4r3hxq4uy
Vibrations in cryocoolers are a recurrent concern to the end user. They appear in different parts of the acoustic spectrum depending on the refrigerator type, Gifford McMahon or pulse-tube, and with a variable coupling strength to the physical system under interest. Here, we use the piezospectroscopic effect in rare-earth doped crystals at low temperature as a high resolution, contact-less probe for the vibrations. With this optical spectroscopic technique, we obtain and analyze the vibrationdoi:10.1063/1.5080086 fatcat:jsiaholdtjhoznppqklrgihnca
more »... ectrum up to 700kHz of a 2kW pulse-tube cooler. We attempt an absolute calibration based on known experimental parameters to make our method partially quantitative and to provide a possible comparison with other well-established techniques.
Microwave Photonics (MWP) and the 2014 9th Asia-Pacific Microwave Photonics Conference (APMP) 2014 International Topical Meeting on
We report on the experimental demonstration of a multi-gigahertz bandwidth RF spectrum analyzer exhibiting a resolution below 20 MHz, based on spectral hole burning in a rare-earth ion-doped crystal. To be compatible with demanding real-time spectrum monitoring applications, our demonstrator is designed to reach a high time resolution. For this purpose, we implemented the so-called "rainbow" architecture in which the spectral components of the incoming signal are angularly separated by thedoi:10.1109/mwp.2014.6994566 fatcat:4x22g3ghpvct3mi7naxpnln67e
more »... al, and are then acquired with a pixelated photodetector. The Tm 3+ :YAG crystal is programmed with a semiconductor DFB laser which frequency scan is servocontrolled and synchronized with the angular scan of a resonant galvanometric mirror, while a high-speed camera is used to acquire the spectra. In the perspective of future implementation within a system, the crystal is cooled below 4 K with a closedcycle cryostat. With this setup, we have been able to monitor and record the spectrum of complex microwave signals over an instantaneous bandwidth above 20 GHz, with a time resolution below 100 µs, 400 resolvable frequency components and a probability of intercept of 100 %. Keywords-Analog optical signal processing, spectrum analysis, broadband microwave spectrum monitoring, spectral hole burning.
Ultrasound modulated optical tomography (UOT) is a powerful imaging technique to discriminate healthy from unhealthy biological tissues based on their optical signature. Among the numerous detection techniques developed for acousto-optic imaging, only those based on spectral filtering are intrinsically immune to speckle decorrelation. This paper reports on UOT imaging based on spectral hole burning in Tm:YAG crystal under a moderate magnetic field (200G) with a well-defined orientation. Thedoi:10.1364/ol.43.003993 pmid:30106935 fatcat:kqlxuafnqvbpxlhng4pyx2pboy
more »... and long-lasting holes translate into a more efficient UOT imaging with a higher contrast and faster imaging frame rate. We demonstrate the potential of this method by imaging calibrated phantom scattering gels.
Louchet-Chauvet, S. Merlet II. PRESENTATION OF THE THREE GRAVIMETERS The three gravimeters involved in the comparison are national references for their respective country. ...doi:10.1109/tim.2010.2099951 fatcat:julssdtybfcybcqvvlhrz2bmqa
., 2001; Louchet-Chauvet et al., 2011) . ... As in Louchet-Chauvet et al. (2011) , the tests were carried out under the assumption that parameters do not change between the measurements. ...doi:10.5194/gi-10-65-2021 fatcat:6rthb77pwfbaxgbznnt7klilzm
[ 1 ] 1 Anne Louchet-Chauvet, Tristan Farah, Quentin Bodart, André Clairon, Arnaud Landragin, Sébastien Merlet, and Franck Pereira Dos Santos, "The influence of trans-verse motion within an atomic gravimeter ...arXiv:1912.04793v1 fatcat:t64hmavjebfdjijfovpo3gykuy