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

The result's identifiers

  • Result code in 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>

  • Result on the web

    <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>

Alternative languages

  • Result language

    angličtina

  • Original language name

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

  • Original language description

    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.

  • Czech name

  • Czech description

Classification

  • Type

    D - Article in proceedings

  • CEP classification

    JA - Electronics and optoelectronics

  • OECD FORD branch

Result continuities

  • Project

  • Continuities

    S - Specificky vyzkum na vysokych skolach

Others

  • Publication year

    2016

  • Confidentiality

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

Data specific for result type

  • Article name in the collection

    SPIE Proceedings - Optics and Measurement International Conference 2016

  • ISBN

    978-1-5106-0754-5

  • ISSN

    0277-786X

  • e-ISSN

  • Number of pages

    10

  • Pages from-to

    1-10

  • Publisher name

    SPIE

  • Place of publication

    Bellingham (stát Washington)

  • Event location

    Liberec

  • Event date

    Oct 11, 2016

  • Type of event by nationality

    WRD - Celosvětová akce

  • UT code for WoS article

    000393154700041