Phase dependent multimode interference device for coupled cavity lasers

    公开(公告)号:US10012794B2

    公开(公告)日:2018-07-03

    申请号:US15320445

    申请日:2015-06-18

    IPC分类号: G02B6/28 H01S5/10 H01S5/40

    摘要: A 3×3 multi-mode interference coupling device having a length L and a width W, a center input port between a pair of outer input ports, where each outer input port is displaced from the center input port by a distance W/3, and a center output port between a pair of outer output ports, where each outer output port is displaced from the center output port by a distance W/3, where the device is supports Cbar, Ccen, and a Cx coupling coefficients therein, when the outer input ports are equally excited with an input signal having a 180° phase difference, Ccen from each outer input port destructively interferes when the propagation length L is an integer number of Lπ/2, where the device outputs equal intensity laser modes from each outer output port when the propagation length is an integer multiple of Lπ/2.

    Laser processing apparatus and method and an optical component therefor

    公开(公告)号:US20180147661A1

    公开(公告)日:2018-05-31

    申请号:US15580751

    申请日:2015-06-09

    申请人: Corelase Oy

    摘要: The invention concerns an apparatus and its use for laser processing. The invention also concerns a method and an optical component. According to the invention, at a first laser device, providing a first optical feed fiber and a second laser device providing a second optical feed fiber is provided. A beam combining means connected to the first and second feed fibers and to a multi-core optical fiber is adapted to form a composite laser beam by having the first optical feed fiber aligned with a first core of the multi-core optical fiber and the second optical feed fiber aligned with at least one second core of the multi-core optical fiber. The first and second cores outputs a composite laser beam to a workpiece to be processed. A control unit individually controls the power density of the output laser beams.