Experimental observation of the slowdown of optical beams by a volume-index grating in a photorefractive LiNbO3 crystal

Shiuan-Huei Lin*, Ken-Yuh Hsu, Pochi Yeh

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

We investigate the group velocity of light in a one-dimensional volume-index grating inside a photorefractive LiNbO3 crystal. The slowdown of the group electromagnetic propagation is observed experimentally by tuning of the wave number of the optical beam close to the outside edge of the forbidden bandgap. We obtain a large group index of up to 7.5 in a 3.5-cm crystal sample. The group index is compared with the result of a theoretical derivation. The results are presented and discussed.

Original languageEnglish
Pages (from-to)1582-1584
Number of pages3
JournalOptics Letters
Volume25
Issue number21
DOIs
StatePublished - 1 Nov 2000

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