Yeda Research and Develpment & Co. Ltd

Nir Davidson

Asher Albert Friesem

Erez Hasman

Amiel A Ishaaya

Liran Shimshi

Yochay Danziger

Ram Oron

Shmuel Blit

Nir Friedman

Moti Fridman

Ariel Kaplan

Measuring polarization profile along an input optical beam cross-section using an optical system includes a polarization beam splitting assembly for splitting the input beam into a predetermined number of beam components with a predetermined polarization relation between them, and including a polarization beam splitter in an optical path of the input beam splitting it into beam components having a polarization relationship and a birefringent element in an optical path of the beam components for splitting each of them into a pair of beams having ordinary and extraordinary polarizations, thereby producing the predetermined number of output beam components. The pixel matrix is located in substantially non-intersecting optical paths of the output beam components and generates a number of output data pieces indicative of intensity distribution within the output beam components and data contained therein being indicative of the polarization profile along the input beam cross-section.

System and method for polarization measurement

A resonator cavity (A) and method are provided. The resonator cavity (A) includes at least one gain medium () and end reflectors () which define together longitudinal modes of light in the cavity, and further includes an intra-cavity beam coupler assembly (). The beam coupler assembly () is configured to split light impinging thereon into a predetermined number of spatially separated light channels, and to cause phase locking and at least partial coherent combining of the light channels, having common longitudinal and transverse modes, in a double pass through the beam coupler assembly (). The resonator cavity (A) is configured and operable to produce at least one output combined light channel of a predetermined intensity profile.

Resonator cavity configuration and method

A resonator cavity (A) and method and presented. The resonator cavity (A) comprises at least one gain medium () and end reflectors () which define together longitudinal modes of light in the cavity, and further comprises an intra-cavity beam coupler assembly (). The beam coupler assembly () is configured to split light impinging thereon into a predetermined number of spatially separated light channels, and to cause phase locking and at least partial coherent combining of the light channels, having common longitudinal and transverse modes, in a double pass through the beam coupler assembly (). The resonator cavity (A) is configured and operable to produce at least one output combined light channel of a predetermined intensity profile.

An optical resonator supporting two sets of simultaneously co-existent oscillation modes (and), having polarizations orthogonal to each other. Mode control elements (and), such as apertures and phase elements, are introduced into the resonator to allow only preferred modes to exist. The placement and orientation of the sets are designed such that the high intensity zones of one set fall on the nodes or low intensity zones of the other set in an interlaced pattern. Thus, in a laser resonator, better utilization of the gain medium () is achieved and the beam quality and brightness over multimode lasing are improved. This configuration improves the performance of high Fresnel number resonators, in both pulsed and continuous lasers, for applications such as scribing, drilling, cutting, target designation and rangefinding. An application of the intra-cavity coherent summation of orthogonally polarized modes is described, whereby azimuthally or radially polarized beams may be obtained.

Optical resonators with orthogonally polarized modes

An acousto-optic scanning system, which relies on two counter propagating acoustic waves with the same frequency modulation. This scheme completely suppresses the linear frequency chirp, and thus enables the generation of fast non-linear scans and non-constant linear scans. By changing the phase between the modulating signals, this scheme also provides fast longitudinal scans of the focal point.

Acousto-optic scanning system with fast non-linear scan

Optical resonator with spiral optical elements

A triangulation optical system and method for determining at least one coordinate of a surface of an object, along at least one coordinate axis which is substantially transverse to the surface. The method includes the steps of providing incident light of a substantially wide wavelength bandwidth propagating along the axis. Passing the light through an axially dispersing optics so that the light of different wavelengths is focussed at different locations relative to the axis. The different locations defining a multi-colored measuring area and a distance between extreme locations along the axis defining a depth of measuring range. Further, off-axis imaging of the measuring area, detecting intensity of the image and determining the coordinate of the intersection of the surface with the measuring area.

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Rishon Lezion, Israel

Nir Davidson