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Monitoring of overmodulation effect in high efficient generally slanted transmission gratings produced in photopolymers

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F16%3A00309207" target="_blank" >RIV/68407700:21340/16:00309207 - isvavai.cz</a>

  • Výsledek na webu

    <a href="http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2585106" target="_blank" >http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2585106</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1117/12.2256488" target="_blank" >10.1117/12.2256488</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Monitoring of overmodulation effect in high efficient generally slanted transmission gratings produced in photopolymers

  • Popis výsledku v původním jazyce

    In our laboratory, we use for fabrication of volume phase diffraction gratings a photopolymer recording material Bayfol HX. It is an extremely effective recording material; a high value of the refractive index modulation is obtained already during a holographic exposure. The value of this refractive index modulation influences the diffraction properties (e.g. efficiency) of the recorded gratings and, in the case of transmission gratings, the growth of this modulation beyond the optimal value leads to an effect of so called overmodulation. This effect is, in the most cases, unwanted as it causes the decrease of the diffraction efficiency from its maximum value (practically close to 100%). The analysis whether the grating is over-or under-modulated is relatively difficult as the value of the refractive index modulation can't be measured directly and it is evaluated from the measurement of the diffraction efficiency. However, the obtained value can be often incorrect due to the overmodulation effect. In this contribution, we would like to extend (to include any arbitrary slanted transmission gratings) and discuss a simple measurement method for the determination of the correct value of the refractive index modulation based on a multiple/two-wavelength measurement of a diffraction efficiency of transmission gratings. The theoretical idea of this method and also experimental results obtained on photopolymer Bayfol HX will be presented. From practical point of view, this approach help us mainly for correct adjustment of exposure parameters to reach efficient gratings.

  • Název v anglickém jazyce

    Monitoring of overmodulation effect in high efficient generally slanted transmission gratings produced in photopolymers

  • Popis výsledku anglicky

    In our laboratory, we use for fabrication of volume phase diffraction gratings a photopolymer recording material Bayfol HX. It is an extremely effective recording material; a high value of the refractive index modulation is obtained already during a holographic exposure. The value of this refractive index modulation influences the diffraction properties (e.g. efficiency) of the recorded gratings and, in the case of transmission gratings, the growth of this modulation beyond the optimal value leads to an effect of so called overmodulation. This effect is, in the most cases, unwanted as it causes the decrease of the diffraction efficiency from its maximum value (practically close to 100%). The analysis whether the grating is over-or under-modulated is relatively difficult as the value of the refractive index modulation can't be measured directly and it is evaluated from the measurement of the diffraction efficiency. However, the obtained value can be often incorrect due to the overmodulation effect. In this contribution, we would like to extend (to include any arbitrary slanted transmission gratings) and discuss a simple measurement method for the determination of the correct value of the refractive index modulation based on a multiple/two-wavelength measurement of a diffraction efficiency of transmission gratings. The theoretical idea of this method and also experimental results obtained on photopolymer Bayfol HX will be presented. From practical point of view, this approach help us mainly for correct adjustment of exposure parameters to reach efficient gratings.

Klasifikace

  • Druh

    D - Stať ve sborníku

  • CEP obor

    JA - Elektronika a optoelektronika, elektrotechnika

  • OECD FORD obor

Návaznosti výsledku

  • Projekt

  • Návaznosti

    S - Specificky vyzkum na vysokych skolach

Ostatní

  • Rok uplatnění

    2016

  • Kód důvěrnosti údajů

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Údaje specifické pro druh výsledku

  • Název statě ve sborníku

    SPIE Proceedings - Optics and Measurement International Conference 2016

  • ISBN

    978-1-5106-0754-5

  • ISSN

    0277-786X

  • e-ISSN

  • Počet stran výsledku

    10

  • Strana od-do

    1-10

  • Název nakladatele

    SPIE

  • Místo vydání

    Bellingham (stát Washington)

  • Místo konání akce

    Liberec

  • Datum konání akce

    11. 10. 2016

  • Typ akce podle státní příslušnosti

    WRD - Celosvětová akce

  • Kód UT WoS článku

    000393154700041