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  1. AU="Cialdi, S"
  2. AU="Rabe, Lisa"
  3. AU="Chen, Jinghui"
  4. AU="Callegaro, Giulia"
  5. AU="Chen, Benson"
  6. AU="Paccou, Julien"
  7. AU="Martino, Eliana"
  8. AU="Omar, Sara Ibrahim"
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  1. Article ; Online: Effect of the local energy distribution of x-ray beams generated through inverse Compton scattering in dual-energy imaging applications.

    Paternò, G / Cardarelli, P / Fantoni, S / Masoumi, F / Mettivier, G / Cialdi, S / Taibi, A

    Applied optics

    2023  Volume 62, Issue 17, Page(s) 4399–4408

    Abstract: X-ray sources based on the inverse Compton interaction between a laser and a relativistic electron beam are emerging as a promising compact alternative to synchrotron for the production of intense monochromatic and tunable radiation. The emission ... ...

    Abstract X-ray sources based on the inverse Compton interaction between a laser and a relativistic electron beam are emerging as a promising compact alternative to synchrotron for the production of intense monochromatic and tunable radiation. The emission characteristics enable several innovative imaging techniques, including dual-energy K-edge subtraction (KES) imaging. The performance of these techniques is optimal in the case of perfectly monochromatic x-ray beams, and the implementation of KES was proven to be very effective with synchrotron radiation. Nonetheless, the features of inverse Compton scattering (ICS) sources make them good candidates for a more compact implementation of KES techniques. The energy and intensity distribution of the emitted radiation is related to the emission direction, which means different beam qualities in different spatial positions. In fact, as the polar angle increases, the average energy decreases, while the local energy bandwidth increases and the emission intensity decreases. The scope of this work is to describe the impact of the local energy distribution variations on KES imaging performance. By means of analytical simulations, the reconstructed signal, signal-to-noise ratio, and background contamination were evaluated as a function of the position of each detector pixel. The results show that KES imaging is possible with ICS x-ray beams, even if the image quality slightly degrades at the detector borders for a fixed collimation angle and, in general, as the beam divergence increases. Finally, an approach for the optimization of specific imaging tasks is proposed by considering the characteristics of a given source.
    Language English
    Publishing date 2023-09-14
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.489239
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Squeezing Phase Diffusion.

    Cialdi, Simone / Suerra, Edoardo / Olivares, Stefano / Capra, Stefano / Paris, Matteo G A

    Physical review letters

    2020  Volume 124, Issue 16, Page(s) 163601

    Abstract: We address the use of optical parametric oscillator (OPO) to counteract phase diffusion, and demonstrate phase-noise reduction for coherent signals traveling through a suitably tuned OPO. In particular, we theoretically and experimentally show that there ...

    Abstract We address the use of optical parametric oscillator (OPO) to counteract phase diffusion, and demonstrate phase-noise reduction for coherent signals traveling through a suitably tuned OPO. In particular, we theoretically and experimentally show that there is a threshold value on the phase noise, above which OPO can be exploited to "squeeze" phase noise. The threshold depends on the energy of the input coherent state, and on the relevant parameters of the OPO, i.e., gain and input-output and crystal loss rates.
    Language English
    Publishing date 2020-05-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.124.163601
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: Experimentally determining the incompatibility of two qubit measurements

    Smirne, Andrea / Cialdi, Simone / Cipriani, Daniele / Carmeli, Claudio / Toigo, Alessandro / Vacchini, Bassano

    2021  

    Abstract: We describe and realize an experimental procedure for assessing the incompatibility of two qubit measurements. The experiment consists in a state discrimination task where either measurement is used according to some partial intermediate information. The ...

    Abstract We describe and realize an experimental procedure for assessing the incompatibility of two qubit measurements. The experiment consists in a state discrimination task where either measurement is used according to some partial intermediate information. The success statistics of the task provides an upper bound for the amount of incompatibility of the two measurements, as it is quantified by means of their incompatibility robustness. For a broad class of unbiased and possibly noisy qubit measurements, one can make this upper bound coincide with the true value of the robustness by suitably tuning the preparation of the experiment. We demonstrate this fact in an optical setup, where the qubit states are encoded into the photons' polarization degrees of freedom, and incompatibility is directly accessed by virtue of a refined control on the amplitude, phase and purity of the final projection stage of the measurements. Our work thus establishes the practical feasibility of a recently proposed method for the detection of quantum incompatibility.

    Comment: 12+3 pages, 9 figures
    Keywords Quantum Physics
    Subject code 612
    Publishing date 2021-12-15
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Simple scheme for ultraviolet time-pulse shaping.

    Cialdi, S / Vicario, C / Petrarca, M / Musumeci, P

    Applied optics

    2007  Volume 46, Issue 22, Page(s) 4959–4962

    Abstract: We present a method to generate high-energy flat-top UV laser pulses such as the ones needed to optimally drive high-brightness radio-frequency photoinjectors. In this scheme we believe to be novel, the longitudinal profile of a laser pulse from a Ti: ... ...

    Abstract We present a method to generate high-energy flat-top UV laser pulses such as the ones needed to optimally drive high-brightness radio-frequency photoinjectors. In this scheme we believe to be novel, the longitudinal profile of a laser pulse from a Ti:sapphire master oscillator power amplifier system is controlled using a mechanical mask in the Fourier plane of a 4f stretcher located after the harmonic conversion crystals. Such a scheme allows us to overcome many of the difficulties faced by current state-of-the-art pulse-shaping designs. These are in fact based on various versions of preamplifier infrared shapers and hence suffer from the limitations set by the nonlinearities of chirped-pulse amplification and harmonic conversion. Beyond the clear advantages of simplicity and robustness, the proposed solution offers the possibility to deliver a pulse with very short rise and fall times and to freely change the output pulse length. We also note that, after proper calibration between spectral and temporal profiles, the shaper optical setup offers the possibility to retrieve the longitudinal profile of the laser pulse on a shot-to-shot basis.
    Language English
    Publishing date 2007-03-16
    Publishing country United States
    Document type Journal Article
    ISSN 1559-128X
    ISSN 1559-128X
    DOI 10.1364/ao.46.004959
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: High-power third-harmonic flat pulse laser generation.

    Cialdi, S / Petrarca, M / Vicario, C

    Optics letters

    2006  Volume 31, Issue 19, Page(s) 2885–2887

    Abstract: The generation of a high-power laser pulse at 266 nm that is longitudinally shaped according to a prefixed intensity profile is reported. The main features of the pulse shape modifications due to second- and third-harmonic conversions are measured, and ... ...

    Abstract The generation of a high-power laser pulse at 266 nm that is longitudinally shaped according to a prefixed intensity profile is reported. The main features of the pulse shape modifications due to second- and third-harmonic conversions are measured, and the results are in good agreement with the theory. The UV temporal shape depends on the chirp of the fundamental pulse and on the crystal phase-matching angle. Exploiting the large stretching imposed on the third-harmonic signal, we show that the pulse intensity profile can be obtained by spectral single-shot measurements.
    Language English
    Publishing date 2006-10-01
    Publishing country United States
    Document type Journal Article
    ISSN 0146-9592
    ISSN 0146-9592
    DOI 10.1364/ol.31.002885
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: BriXS, a new X-ray inverse Compton source for medical applications.

    Cardarelli, P / Bacci, A / Calandrino, R / Canella, F / Castriconi, R / Cialdi, S / Del Vecchio, A / di Franco, F / Drebot, I / Gambaccini, M / Giannotti, D / Loria, A / Mettivier, G / Paternò, G / Petrillo, V / Rossetti Conti, M / Russo, P / Sarno, A / Suerra, E /
    Taibi, A / Serafini, L

    Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)

    2020  Volume 77, Page(s) 127–137

    Abstract: MariX is a research infrastructure conceived for multi-disciplinary studies, based on a cutting-edge system of combined electron accelerators at the forefront of the world-wide scenario of X-ray sources. The generation of X-rays over a large photon ... ...

    Abstract MariX is a research infrastructure conceived for multi-disciplinary studies, based on a cutting-edge system of combined electron accelerators at the forefront of the world-wide scenario of X-ray sources. The generation of X-rays over a large photon energy range will be enabled by two unique X-ray sources: a Free Electron Laser and an inverse Compton source, called BriXS (Bright compact X-ray Source). The X-ray beam provided by BriXS is expected to have an average energy tunable in the range 20-180 keV and intensities between 10
    MeSH term(s) Electrons ; Lasers ; Photons ; Radiography ; X-Rays
    Language English
    Publishing date 2020-08-20
    Publishing country Italy
    Document type Journal Article
    ZDB-ID 1122650-x
    ISSN 1724-191X ; 1120-1797
    ISSN (online) 1724-191X
    ISSN 1120-1797
    DOI 10.1016/j.ejmp.2020.08.013
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    In stock of ZB MED Cologne/Königswinter

    Zs.B 2941: Show issues Location:
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  8. Article ; Online: Innovative method to investigate how the spatial correlation of the pump beam affects the purity of polarization entangled states.

    Cialdi, Simone / Brivio, Davide / Tabacchini, Andrea / Kadhim, Ali Mohammed / Paris, Matteo G A

    Optics letters

    2012  Volume 37, Issue 19, Page(s) 3951–3953

    Abstract: We present an innovative method to address the relation between the purity of type-I polarization entangled states and the spatial properties of the pump laser beam. Our all-optical apparatus is based on a spatial light modulator, and it offers ... ...

    Abstract We present an innovative method to address the relation between the purity of type-I polarization entangled states and the spatial properties of the pump laser beam. Our all-optical apparatus is based on a spatial light modulator, and it offers unprecedented control on the spatial phase function of the entangled states. In this way, we demonstrate quantitatively the relation between the purity of the generated state and the spatial field correlation function of the pump beam.
    Language English
    Publishing date 2012-10-01
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.37.003951
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Real-time dosimetry with Yb-doped silica optical fibres.

    Veronese, Ivan / Chiodini, Norberto / Cialdi, Simone / d'Ippolito, Eduardo / Fasoli, Mauro / Gallo, Salvatore / La Torre, Stefano / Mones, Eleonora / Vedda, Anna / Loi, Gianfranco

    Physics in medicine and biology

    2017  Volume 62, Issue 10, Page(s) 4218–4236

    Abstract: Over the years, many efforts have been made to develop radiation detectors to handle the complex issues of small field dosimetry and achieve the increasing accuracy, precision and in vivo dose monitoring required by the new advanced treatment modalities. ...

    Abstract Over the years, many efforts have been made to develop radiation detectors to handle the complex issues of small field dosimetry and achieve the increasing accuracy, precision and in vivo dose monitoring required by the new advanced treatment modalities. In this context, interest has surged in the development of sensors based on scintillating optical fibres. In this paper, the near-infrared radioluminescence and dosimetric properties of Yb-doped silica optical fibres, coupled with a laboratory prototype based on an avalanche photodiode, were studied by irradiating the fibres with photons and electron beams generated by a Varian Trilogy accelerator. The performance of the system in standard and small field sizes has also been investigated, comparing the output factor, percentage depth dose and off-axis ratio measurements of the prototypal detector with other commercial sensors, including the Exradin W1 scintillator. The results of this study demonstrate that the drawback due to the stem effect in Yb-doped silica optical fibres can be managed in a simple but effective way by optical filtering. The robustness of the system in complex dosimetric scenarios and the accuracy and precision achieved by Yb-doped fibres in relative dose assessments suggest an effective use of the system for real-time in vivo dosimetry applications.
    MeSH term(s) Optical Fibers ; Photons ; Radiometry/instrumentation ; Silicon Dioxide/chemistry ; Time Factors ; Ytterbium/chemistry
    Chemical Substances Silicon Dioxide (7631-86-9) ; Ytterbium (MNQ4O4WSI1)
    Language English
    Publishing date 2017-03-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 208857-5
    ISSN 1361-6560 ; 0031-9155
    ISSN (online) 1361-6560
    ISSN 0031-9155
    DOI 10.1088/1361-6560/aa642f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 199: Show issues Location:
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  10. Article: Laser sources for efficient two-step Positronium excitation to Rydberg states

    Becucci, M / Ferrari, G / Boscolo, I / Castelli, F / Cialdi, S / Villa, F / Giammarchi, M.G

    Journal of molecular structure. 2011 May 3, v. 993, no. 1-3

    2011  

    Abstract: Antihydrogen production by charge exchange reaction between Positronium atoms and antiprotons benefits from an efficient excitation of Positronium atoms to high-n levels (Rydberg levels). A two-step optical excitation, the first from ground to n=3 and ... ...

    Abstract Antihydrogen production by charge exchange reaction between Positronium atoms and antiprotons benefits from an efficient excitation of Positronium atoms to high-n levels (Rydberg levels). A two-step optical excitation, the first from ground to n=3 and the second from this level to a Rydberg level, is proposed and a proper laser system to be developed is discussed. The requirements on the energy and bandwidth of the excitation laser suggest the use of optical parametric generation technology for both wavelengths. The laser system is composed of two subsystems: one for the generation of 205nm radiation and the other for the generation of 1670nm radiation. We report on the progress towards the realization of the short wavelength source.
    Keywords energy requirements ; lasers ; wavelengths
    Language English
    Dates of publication 2011-0503
    Size p. 495-499.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 194476-9
    ISSN 0022-2860 ; 0377-046X
    ISSN 0022-2860 ; 0377-046X
    DOI 10.1016/j.molstruc.2011.01.064
    Database NAL-Catalogue (AGRICOLA)

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    Zs.A 1205: Show issues Location:
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