Roland Andreas Bitterli

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Efficient light management is one of the key issues in modern energy conversion systems, be it to collect optical power or to redistribute light generated by high power light emitters. This thesis touches mainly on the subject of efficient light redistribu ...

We study experimentally and theoretically the electromagnetic field in amplitude and phase behind ball-lenses across a wide range of diameters, ranging from a millimeter scale down to a micrometer. Based on the observation, we study the transition between ...

In previous work, we showed that two degree of freedom oscillators can be advantageously applied to horological time bases since they can be used to eliminate the escapement mechanism. We subsequently examined planar two degree of freedom oscillators based ...

Certain high power laser applications require thin homogeneous laser lines. In this paper we describe the concept, fabrication and characterization of a 1-D diffuser that generates such a line. The device is based on an array of concave cylinder lenses wit ...

We define isotropic springs to be central springs having the same restoring force in all directions. In previous work, we showed that isotropic springs can be advantageously applied to horological time bases since they can be used to eliminate the escapeme ...

We present a new approach of beam homogenizing elements based on a statistical array of concave cylindrical microlens arrays. Those elements are used to diffuse light in only one direction and can be employed together with fly’s eye condensers to generate ...

L’échappement à détente est reconnu pour sa performance chronométrique, mais il n’est pas sécurisé pour la montre-bracelet. Plusieurs échappements ont été proposés pour adapter cet échappement à la montre, dont l’échappement Robin récemment sécurisé par Au ...

À l'origine, le but du tourbillon était d'améliorer la chronométrie d'une montre de poche en moyennant ses positions verticales. Avec I'avènement de la montre-bracelet, le tourbillon est prisé plus pour la prouesse technique de sa réalisation que pour sa f ...

Roland Andreas Bitterli

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On Micro Optical Elements for Efficient Light Diffusion

Refraction limit of miniaturized optical systems: a ball-lens example

Theory and design of spherical oscillator mechanisms

Fabrication and Characterization of 1-D diffusing elements

Isotropic springs based on parallel flexure stages

Fabrication and characterization of linear diffusers based on concave micro lens arrays

Echappements à impulsion virtuelle

Multifunctional Micro-Optical Elements for Laser Beam Homogenizing and Beam Shaping

Refractive statistical concave 1D diffusers for laser beam shaping

La géométrie du tourbillon