Comparison of methods for determining the bias index of a dichromated gelatin hologram

Gene Campbell, T. J. Kim, Raymond K. Kostuk

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Determination of the bias refractive index of a holographic emulsion before exposure and after development is an important factor in the design of holographic optical elements. Several experimental methods are discussed for determining the bias index of a volume hologram in dichromated gelatin, and the results for each technique are presented. It is shown experimentally that these measurement methods yield different results for the same hologram, and the cause of the differences is proposed to be a variation of the bias index with depth in the hologram. An index measurement technique is also presented that accounts for variation in the bias index and is shown to yield an accurate value for the bias index.

Original languageEnglish (US)
Pages (from-to)2548-2555
Number of pages8
JournalApplied optics
Issue number14
StatePublished - May 10 1995


  • Dichromated gelatin
  • Index measurement
  • Volume hologram

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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