A new type of diffractive optical instrument, the curved hologram, for which the spatial phase function and the hologram shape can be controlled independently, is investigated for finite distance concentration of diffuse (quasi-monochromatic) light. We show how a simple analytic design for given light source and target geometries yields spatially uniform concentrations of diffuse light at the thermodynamic limit of brightness conservation. Such diffractive elements may provide a useful alternative to reflective cavities for efficient and uniform side-pumping of solid-state lasers.
© 2004 Optical Society of America
(090.1970) Holography : Diffractive optics
(140.5560) Lasers and laser optics : Pumping
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.1770) Optical design and fabrication : Concentrators
Nir Davidson and Nándor Bokor, "Curved diffractive optical element for uniform concentration at the thermodynamic limit at finite distance," J. Opt. Soc. Am. A 21, 656-661 (2004)