The transverse velocity of a spiral galaxy can be measured to an accuracy 60 km s 1 by making parallax observations of quasars being microlensed by stars in the disk of the galaxy. To make the measurement, a quasar must be located behind the disk of the galaxy between about 1 and 2 scale lengths from the center. The quasar must then be monitored for microlensing events and the events followed s...

A new kind of plenoptic imaging system based on Laser Optical Feedback Imaging (LOFI) is presented and is compared to another previously existing device based on microlens array. Improved photometric performances, resolution and depth of field are obtained at the price of a slow point by point scanning. Main properties of plenoptic microscopes such as numerical refocusing on any curved surface ...

We propose a new method imaging through scattering media. An object hidden between two biological tissues (chicken breast) is reconstructed from any speckled images obtained from the output of a multichannel optical imaging system. The effect of multiple imaging is achieved with a microlens array. Each lens is the array projects a different speckled image onto a digital camera. The set of speck...

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 a uniform flat top line for high power coherent light sources. Conception, fabrication and characterization for such 1D diffusers are present...

III Novel submillimeter-size lenses have been fabricated in compound semiconductor substrates by mesa etching and heat treatment. These precision large-numerical-aperture microlenses are well suited for diode lasers and laser arrays in miniaturized systems. Alaser array has been efficiently coupled to an external cavity by a microlens array to achieve coherent phase locking. As part of a semico...

We present a polydimethylsiloxane (PDMS) microlens array on a glass substrate. By adjusting the temperature with indium tin oxide (ITO) microheaters, the properties of the individual microlenses are actively tuned without mechanical movement. We characterize the temperature-dependent changes of the microlenses by focal length and magnification measurements. Experimental results demonstrate that...