Integrated electroholographic photorefractive gratings with sustained longevity by LED illumination

Aharon J. Agranat, Sagi Frishman, Yehudit Garcia, Daniel Rosenthal

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


A method for creating photorefractive electroholographic gratings with sustained operational longevity is presented and demonstrated. The method circumvents the thermal decay and erasure during readout characteristic of photorefractive devices by augmenting the device with a built-in mechanism that writes and periodically and/or continuously refreshes the space-charge gratings which are the core elements of such devices. The mechanism was demonstrated in a slab waveguide constructed in a KLTN:Cu crystal. The space-charge grating was created by illuminating the slab waveguide through a binary grating mask deposited on top of the surface of the crystal by incoherent illumination from a LED. The electroholographic performance manifested by the grating was similar to that of gratings constructed by interfering beams. This makes electroholography to be the basis for a viable technology for performing wavelength selective switching and electrical wavelength tuning at the device level, and enables their assembly in integrated photonic circuits.

Original languageAmerican English
Title of host publicationOptical Components and Materials XVII
EditorsShibin Jiang, Michel J. F. Digonnet
ISBN (Electronic)9781510633155
StatePublished - 2020
EventOptical Components and Materials XVII 2020 - San Francisco, United States
Duration: 4 Feb 20206 Feb 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceOptical Components and Materials XVII 2020
Country/TerritoryUnited States
CitySan Francisco

Bibliographical note

Publisher Copyright:
© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.


  • Electrical wavelength tuning
  • Electro-optical device
  • Electroholography
  • Integrated photonic circuit
  • Photorefractive effect
  • Volume holograms
  • Wavelength routing
  • Wavelength selective switching


Dive into the research topics of 'Integrated electroholographic photorefractive gratings with sustained longevity by LED illumination'. Together they form a unique fingerprint.

Cite this