Equalization For High Density Volume Holographic Storage
Venkatesh Vadde, B. V. K. Vijaya Kumar, et al.
Optical Data Storage 1998
A system of two aspheric lenses is described, which efficiently converts a collimated Gaussian beam to a flattop beam. Departing from earlier designs, both aspheric surfaces were convex, simplifying their fabrication; the output beam was designed with a continuous roll-off, allowing control of the far-field diffraction pattern; and diffraction from the entrance and exit apertures was held to a negligible level. The design principles are discussed in detail, and the performance of the as-built optics is compared quantitatively with the theoretical design. Approximately 78% of the incident power is enclosed in a region with 5% rms power variation. The 8-mm-diameter beam propagates approximately 0.5 m without significant change in the intensity profile; when the beam is expanded to 32 mm in diameter, this range increases to several meters. © 2000 Optical Society of America.
Venkatesh Vadde, B. V. K. Vijaya Kumar, et al.
Optical Data Storage 1998
John A. Hoffnagle, David L. Shealy
SPIE Optics + Photonics 2005
Geoffrey W. Burr, Hans Coufal, et al.
Optics Letters
John A. Hoffnagle, David L. Shealy
SPIE Photonic Devices + Applications 2007