公开(公告)号：US20020154672A1

公开(公告)日：2002-10-24

申请号：US10099473

申请日：2002-03-15

Applicant: Yeda Research and Development Co. Ltd.

Inventor： Asher A. Friesem ,  Shmuel Blit ,  Ram Oron ,  Erez Hasman ,  Nir Davidson

IPC: H01S003/08

CPC classification number: H01S3/08036 ,  H01S3/08054 ,  H01S3/082 ,  H01S3/106 ,  H01S2301/20 ,  H01S2301/203

Abstract: An optical resonator supporting two sets of simultaneously co-existent oscillation modes (30 and 31), having polarizations orthogonal to each other. Mode control elements (28 and 29), 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 (24) 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.

Abstract translation: 支持两组同时共存的振荡模式（30和31）的光学谐振器，具有彼此正交的极化。 将模式控制元件（28和29）（诸如孔径和相位元件）引入到谐振器中，以仅允许存在优选的模式。 这些组的放置和取向被设计成使得一组的高强度区域以交错图案落在另一组的节点或低强度区域上。 因此，在激光谐振器中，实现了增益介质（24）的更好的利用，并提高了多模激光的光束质量和亮度。 这种配置提高了脉冲和连续激光器中高菲涅尔数谐振器的性能，适用于诸如划线，钻孔，切割，目标指定和测距等应用。 描述了正交偏振模式的腔内相干求和的应用，由此可以获得方位角或径向偏振光束。

公开(公告)号：US20010015851A1

公开(公告)日：2001-08-23

申请号：US09801808

申请日：2001-03-09

Applicant: YEDA RESEARCH AND DEVELOPMENT CO., LTD.

Inventor： Yochay Danziger ,  Erez Hasman ,  Asher Friesem

IPC: G02B027/44 ,  G02B005/18

CPC classification number: G02B5/1876

Abstract: A multilevel diffractive optical element comprising a base and a plurality of phase zones having phase levels of a substantially identical height h, each phase zone being defined by a local modulation depth d and a local number of phase levels nullnulld/h, the local number of phase levels null per phase zone being a real number, an integer of which defines the number of complete levels in the phase zone, which complete levels have identical widths, and a fraction of which, in at least one phase zone, defines an incomplete level which is narrower than the complete levels, said local number of phase levels nullnullnull(x, y) varying among different phase zones so as to provide corresponding variation of said local modulation depth dnulld(x, y) whereby local diffraction efficiencies and consequently an overall diffraction efficiency of the optical element is arbitrarily controlled.

Abstract translation: 一种多级衍射光学元件，包括基极和具有基本相同高度h的相位电平的多个相位区域，每个相位区域由局部调制深度d和本地相位级数xgr = d / h定义， 本地相位级数xgr 每个相位区域是实数，其整数定义了相位区域中的完整水平的数量，其完整水平具有相同的宽度，并且其一部分在至少一个相位区域中限定较窄的不完整水平 表示本地数量的相位水平＆xgr; =＆xgr（x，y）在不同相位区域之间变化，以便提供所述局部调制深度d = d（x，y）的相应变化，由此局部衍射效率和 因此光学元件的总体衍射效率是任意控制的。