We introduce a new method to make gradient index (GRIN) lenses in diffusive photopolymers with nearly arbitrary two-dimensional (2D) profiles. By modulating the 2D intensity pattern and power of the exposure with a deformable mirror device (DMD), the index profile of the GRIN lens can be controlled. Combined with the self-developing nature of the photophotopolymer, rapid on-demand printing of arbitrary micro-optics is enabled. We demonstrate the process by fabricating quadratic GRIN lenses, Zernike polynomials and multi-focal lenses.
We present a homodyne detection system implemented for a page-wise holographic memory architecture. Homodyne
detection by holographic memory systems enables phase quadrature multiplexing (doubling address space), and lower
exposure times (increasing read transfer rates). It also enables phase modulation, which improves signal-to-noise ratio
(SNR) to further increase data capacity. We believe this is the first experimental demonstration of homodyne detection
for a page-wise holographic memory system suitable for a commercial design.