Université de Neuchâtel

On the chromatic aberration of microlenses

Ruffieux, Patrick ; Scharf, Toralf ; Herzig, Hans-Peter ; Völkel, Reinhard ; Weible, Kenneth J.

In: Optics Express, 2006, vol. 14, no. 11, p. 4687-4694

The optical properties of plano-convex refractive microlenses with low Fresnel Number (typically FN < 10) are investigated. It turns out that diffraction effects at the lens aperture limit the range of the effective focal length. The upper limit of the focal length is determined by the diffraction pattern of a pinhole with equal diameter. In addition achromatic microlenses can be realized because...

Université de Neuchâtel

Optical optimization of binary phase fan-out elements

Weible, Kenneth J. ; Herzig, Hans-Peter

In: Optics Communications, 1994, vol. 113, no. 1-3, p. 9-14

An optical parallel processor is presented which optimizes binary phase diffractive optical elements using simulated annealing. A liquid crystal television is used to simulate the phase element. Experimental results are presented for the optimization of fan-out elements. The performance of the optical parallel processor is analyzed using Fast Fourier Transform methods.

Université de Neuchâtel

Diffractive optics for compact space communication terminals

Blattner, Peter ; Herzig, Hans-Peter ; Weible, Kenneth J. ; Teijido, Juan M. ; Heimbeck, Hans-Joerg ; Langenbach, E. ; Rogers, J.

In: journal of mo, 1996, vol. 43, no. 7, p. 1473-1484

Free-space laser communication links with data rates between 10 and 500 Mbits s-1 are required to cover the large amount of communication needs between low-orbit satellites, geostationary satellites and ground stations. The objective of this paper is to demonstrate the potential of diffactive optical elements for the design of optical and optoelectronic systems for advanced laser...

Université de Neuchâtel

Potential of dry etching for the fabrication of fused silica micro-optical elements

Nussbaum, Philippe ; Weible, Kenneth J. ; Rossi, Markus ; Herzig, Hans-Peter

In: Micromachine Technology for Diffractive and Holographic Optics (Proceedings of SPIE), 1999, vol. 3879, p. 63-70

We report on recent progress in the fabrication of fused silica micro-optical elements, such as blazed gratings, refractive microlenses and microprisms. The elements are first made in photoresist and then they are transferred into fused silica by reactive ion etching. High selectivity etching is needed to realize structures with a high aspect ratio. Results are shown using various metallic etch...

Université de Neuchâtel

Diffractive optical elements for space communication terminals

Herzig, Hans-Peter ; Ehbets, Peter ; Teijido, Juan M. ; Weible, Kenneth J. ; Heimbeck, Hans-Joerg

In: Space Optics 1994: Space Instrumentation and Spacecraft Optics (Proceedings of SPIE), 1994, vol. 2210, p. 104-111

The potential of diffractive optical elements for advanced laser communication terminals has been investigated. Applications include beam shaping of high- power laser diode arrays, optical filter elements for position detection and hybrid (refractive/diffractive) elements. In addition, we present a design example of a miniaturized terminal including diffractive optics.