A new type of optical instrument, the curved hologram, is introduced that allows us the unique opportunity to independently control its spatial phase function and its shape (whereas in reflecting or refracting optical elements the shape uniquely determines the spatial phase function). We show how proper design of the hologram shape (using a simple analytic procedure) yields perfect uniform collimation and also collimation and concentration of diffuse (monochromatic) light at the thermodynamic limit of brightness conservation. The results of our experimental demonstration as well as those of our numerical ray-tracing simulations verify our design.
© 2002 Optical Society of America
Nándor Bokor and Nir Davidson, "Light collimation, imaging, and concentration at the thermodynamic limit," J. Opt. Soc. Am. A 19, 2479-2483 (2002)