Method and device for generating second harmonic radiation by means of crystal with non-critical phase matching and for controlling relative phase between fundamental frequency electromagnetic field and electromagnetic field with double frequencies

• Main Authors: SERAFINI SIMONE, MICHAUT BARBARA, GATTI, NICOLA, WORTHWICK, LOUISE
• Format: Patent
• Language: Chinese; English
• Published: 04.07.2025
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

A method of generating second harmonic radiation from fundamental frequency radiation comprises the following operating steps: providing one or more nonlinear crystals (C) satisfying conditions of second harmonic generation (SHG) by non-critical phase matching; providing an optical phase actuator (A), upstream or downstream of said nonlinear crystal (C) with respect to the principal optical axis (O) of the nonlinear crystal, a step of varying one or more of said parameters of said optical actuator (A) over time by controlling the temperature of the optical actuator (A) itself, or by applying an electric or magnetic field to said optical actuator (A), the parameters of the optical actuator (A) are determined for which the measured power is maximum relative to the power measured during the execution of the plurality of measurements. 一种从基频辐射产生二次谐波辐射的方法，包括以下操作步骤：提供一个或多个非线性晶体(C)，满足通过非临界相位匹配的二次谐波产生(SHG)的条件；提供光学相位致动器(A)，相对于非线性晶体的主光轴(O)位于所述非线性晶体(C)的上游或下游，通过控制光学致动器(A)本身的温度，或通过向所述光学致动器(A)施加电场或磁场，随时间改变所述光学致动器(A)的一个或多个所述