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Wyniki wyszukiwania dla: two-photon vision
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Wyniki wyszukiwania dla: two-photon vision

  • Towards spectral sensitivity curve for two-photon vision mechanism

    Publikacja
    • M. J. Marzejon
    • Z. Agnieszka
    • D. Stachowiak
    • G. Soboń
    • M. Wojtkowski
    • K. Katarzyna

    - Rok 2022

    Abstract Purpose: The perceived brightness of different visible light sources can be compared with photometric units based on the standardized luminosity curves (300-780nm range). As reported previously (PNAS 111(50), pp. E5445-E5454 (2014)), near-infrared (NIR) radiation can cause isomerization of visual pigments by one- or two-photon absorption. The perceived color of the stimulus is red in the case of one-photon vision (1PV)...

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  • Effects of laser pulse duration in two-photon vision threshold measurements

    Publikacja

    - Proceedings of SPIE - Rok 2021

    Pulsed near-infrared (NIR) light sources can be successfully applied for both imaging and functional testing of the human eye, as published recently1. These two groups of applications have different requirements. For imaging applications, the most preferable is invisible scanning beam while efficiently visible stimulating beam is preferable for functional testing applications. The functional testing of human eye using NIR laser...

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  • Solid state versus fiber picosecond infrared lasers applied to two-photon vision tests

    Publikacja

    - Proceedings of SPIE - Rok 2019

    Development of new microperimetric tools dedicated for imaging of early functional changes in the retina may help in the monitoring of various ocular diseases progression e.g. Age-Related Macular Degeneration. Recently described two-photon vision may be applied to microperimetric devices. Many subjects with well-known disease history could be investigated with newly developed instrumentation that tests ability of human eye to perceive...

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  • Pupil detection supported by Haar feature based cascade classifier for two-photon vision examinations

    Publikacja

    - Rok 2019

    The aim of this paper is to present a novel method, called Adaptive Edge Detection (AED), of extraction of precise pupil edge coordinates from eye image characterized by reflections of external illuminators and laser beams. The method is used for monitoring of pupil size and position during psychophysical tests of two-photon vision performed by dedicated optical set-up. Two-photon vision is a new phenomenon of perception of short-pulsed...

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  • Pupil detection supported by Haar feature based cascade classifier for two-photon vision examinations

    Publikacja

    - Rok 2019

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  • Femtosecond Er-doped fiber laser source tunable from 872 to 1075 nm for two-photon vision studies in humans

    Publikacja
    • D. Stachowiak
    • M. J. Marzejon
    • J. Bogusławski
    • Z. Łaszczych
    • K. Komar
    • M. Wojtkowski
    • G. Soboń

    - Biomedical Optics Express - Rok 2022

    We report the development of a widely-tunable femtosecond fiber laser system and its application for two-photon vision studies. The source is based on an Er-doped fiber laser with spectral shift up to 2150 nm, followed by a second harmonic generation module to generate a frequency-doubled beam tunable from 872 to 1075 nm. The source delivers sub-230 fs pulses with nearly-constant duration over the entire tuning range, with output...

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  • Two-photon microperimetry with picosecond pulses

    Publikacja

    - Biomedical Optics Express - Rok 2021

    Two-photon vision is a phenomenon associated with the perception of short pulsesof near-infrared radiation (900-1200 nm) as a visible light. It is caused by the nonlinear processof two-photon absorption by visual pigments. Here we present results showing the influence ofpulse duration and repetition rate of short pulsed lasers on the visual threshold. We comparedtwo-photon sensitivity maps of the retina obtained for subjects with...

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  • Two-photon perimetry utilizing picosecond laser

    Publikacja

    - Rok 2022

    Age-related impairments are becoming more and more severe for aging societies. The sensory organ diseases are particularly troublesome as they exclude seniors from their everyday activity. Therefore, maintaining good quality eyesight is essential for normal functioning. New medical therapies help restrain age-related changes, but still, monitoring is essential to the treatment process. Humans do not have the natural ability to...

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  • Method for universal detection of two-photon polarization entanglement

    Publikacja
    • K. Bartkiewicz
    • P. Horodecki
    • K. Lemr
    • A. Miranowicz
    • K. Życzkowski

    - PHYSICAL REVIEW A - Rok 2015

    Detecting and quantifying quantum entanglement of a given unknown state poses problems that are fundamentally important for quantum information processing. Surprisingly, no direct (i.e., without quantum tomography) universal experimental implementation of a necessary and sufficient test of entanglement has been designed even for a general two-qubit state. Here we propose an experimental method for detecting a collective universal...

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  • Two-photon double ionization of atoms in attosecond x-ray radiation fields

    Publikacja

    - PHYSICAL REVIEW A - Rok 2010

    We consider two-photon double ionization of helium with 100, 200, and 400 eV excess energy for the two ejected electrons, corresponding to photon energies of 89.5, 139.5, and 239.5 eV, respectively. We focus on the case of ultrashort pulses (two oscillations of the field) and develop an approach to calculate the two-photon transition matrix elements within the lowest order of the time-dependent perturbation theory. One of the...

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