A NARROW-BAND INTERFERENCE FILTER WITH PHOTOREFRACTIVE LINBO3

A narrow-bandwidth interference filter has been developed using volume holography in photorefractive LiNbO3 crystals. The device works as a Bragg reflector using a volume hologram recorded, fixed and developed in a LiNbO3 sample. With a 2 mm thick LiNbO3 plate the following perfo rmances have been achieved: a peak reflectivity above 32%, a full-widt h at half-maximum bandwidth below 0.05 nm, an angular field of view of about 3-degrees and a peak wavelength of 518.45 nm (for green Ar lase r writing wavelength). These performances compare well with that exhib ited by the conventional Lyot-Ohman and Solc filters. A complete expla nation of the fabrication procedure is given, including practical deta ils needed for producing such an efficiency with fixed holograms in Li NbO3.