An optical wavefront testing system includes a light source, an image capturing unit and a processing unit. The image capturing unit includes a lens array and a sensor module that is configured to detect light rays passing through an optical element and the lens array. The processing unit controls the sensor module to detect the light rays under a plurality exposure conditions for generating a plurality of images each including a plurality of light spots, obtains a plurality of light spot datasets corresponding to the light spots and each including a plurality of pixel coordinate sets and a plurality of pixel values, and obtains wavefront information associated with the light spots based on the light spot datasets of at least two of the images.

A compact adaptive optics system for long-range horizontal paths imaging that improves degraded images. The system uses a filter that corresponds to the three colors in a typical color detector element, one or more optic elements, a deformable mirror, and a detector. Focus errors, due to turbulence, in the image recorded by the detector element show up as image shifts in the three distinct color images. The shifts and statistics of these shifts between these simultaneous images are used to create control signals for the deformable mirror resulting in a compact adaptive optic system for horizontal paths without need for a point source located at the distance scene being imaged. Analysis of the relative pixel shifts in various regions of the image provides third order statistics revealing tip/tilt and additional Zernikes modes that are used to control a deformable mirror without the need for a guide star/point-source.

The present application relates to a device for testing optical properties and a method for testing optical properties using the same. The device of the present application has inexpensive manufacturing and maintenance costs, is capable of testing a wide range of plane directional phase differences, and provides the method for testing optical properties with improved identification efficiency of the phase retardation axis.

A computer-aided image correction method for images with at least spatially partially coherent light requiring only a phase-modulated image as input. It does not reconstruct the phases on the image sensor, but rather assumes that they should ideally all be the same. With this assumption, the invention formulates a constraint and an update rule. The result of the iteration is an amplitude distribution of the lightwave field, which could have been measured directly if aberrations in the form of wavefront distortions had not contributed to the actual image acquisition. Further, a device that can, using the image correction method, be used as an adaptive optic for imaging instruments.

The present invention is intended to provide an adaptive optics system and an optical device that allow correction of wavefront phase aberration with higher accuracy than before and have a wider correction range than the conventional ones, regardless of the distance between the observation target and the fluctuation layer, and the size of the observation target. An adaptive optics system includes: a wavefront phase modulator that makes aberration correction to incident light and emits the corrected light; and an imaging-conjugated position adjustment mechanism that adjusts freely within a specimen the position of a surface imaging-conjugated with a fluctuation correction surface formed by the wavefront phase modulator. The imaging-conjugated position adjustment mechanism adjusts the fluctuation correction surface to be imaging-conjugated with a fluctuation layer existing in the specimen.

An optical wavefront testing system includes a light source, an image capturing unit and a processing unit. The image capturing unit includes a lens array and a sensor module that is configured to detect light rays passing through an optical element and the lens array. The processing unit controls the sensor module to detect the light rays under a plurality exposure conditions for generating a plurality of images each including a plurality of light spots, obtains a plurality of light spot datasets corresponding to the light spots and each including a plurality of pixel coordinate sets and a plurality of pixel values, and obtains wavefront information associated with the light spots based on the light spot datasets of at least two of the images.

According to one aspect, the present description relates to a device for analysing a wavefront, configured to be connected to a fluorescence microscopy imaging system with optical sectioning, equipped with a microscope objective comprising a pupil in a pupil plane, the analysis device comprising a two-dimensional detector comprising a detection plane; a two-dimensional arrangement of microlenses, arranged in an analysis plane, each microlens being configured to form, on the detection plane, when the analysis device is connected to the microscopic imaging system, an image of an object situated in a focal plane of the microscope objective, with a given analysis field; an optical relay system configured to optically conjugate the analysis plane and the pupil plane; a field diaphragm positioned in a plane optically conjugated with the plane of detection, and configured to define said analysis field; a processing unit configured to determine, based on the set of images formed by the microlenses, a two-dimensional map of a characteristic parameter of the wavefront in said analysis plane.

A method for determining the complex amplitude of the electromagnetic field associated with a scene, comprising a) capturing a plurality of images of the scene by means of a photographic camera, the images being focused in planes of focus arranged at different distances, wherein the camera comprises a lens of focal length F and a sensor arranged at a certain distance from the lens in its image space, taking at least one image pair from the plurality of images and determining the accumulated wavefront to the conjugate plane in the object space corresponding to the intermediate plane with respect to the planes of focus of the two images of the pair.

The present invention provides a free space optical communication system that uses orthogonal modes of aberration in a laser beam as means for encoding the information. The system comprises a transmission station which transmits the user defined information in terms of the amplitudes of certain orthogonal aberration modes present in the transmitted beam. The beam then travels through free space before it reaches the receiving station. The receiving station comprises a high speed wavefront sensor of light beams. The wavefront sensor measures the amplitudes of various orthogonal aberration modes present in the incident beam at different instants of time. The amplitudes of the orthogonal modes at a certain regular time interval are then used to extract the user information.

A wavefront analyzer is modified to simply determine the differences in amplitude and tilt which can exist between the different regions of an initial wavefront (S0). To achieve this, interference between two waves only is produced from beams (F1, F2) which come from neighboring regions on the initial wavefront. Such an analyzer can be used to coherently combine laser radiation produced by different sources arranged in parallel. Another use is for the determination of the differences in height and inclination which exist between the neighboring mirror segments of a Keck telescope.