The construction of a write-once-read-many-type optical write-read-head for volume holographic data storage
in disk-based photopolymer storage media is discussed. Its design is based on the photonic integration concept
called planar-integrated free-space optics. A proof-of-principle demonstrator was fabricated, it contains a 3mm
thick fused silica wafer that carries most passive components for the reference and the signal beam relay in
the form of diffractive optical elements, a translucent liquid crystal microdisplay, and the CCD sensor of a
webcam. Phenanthrenequinone-doped polymethylmethacrylate was chosen as storage material, a DPSS laser
with λ = 532nm serves as light source. We report about preliminary experiments to determine suitable exposure
parameters for holographic write-read operations, and on the use of data matrix codes for the encoding and
decoding of information.
We discuss the micro-integration of an optical write-read head for disk-based volume holographic data storage. A
particular approach based on the design principle of
planar-integrated free-space optics and on photopolymer storage
materials is proposed. Numerical construction parameters are calculated and initial experimental results concerning the
performance of the photopolymer are presented.