公开(公告)号：US3824717A

公开(公告)日：1974-07-23

申请号：US38393573

申请日：1973-07-30

Applicant: HUGHES AIRCRAFT CO

Inventor： EVTUHOV V ,  SOFFER B ,  TSENG D

IPC: G02F1/39 ,  H03F7/00

CPC classification number: G02F1/39 ,  G02F2201/17

Abstract: There is disclosed an optical frequency up-conversion system which uses a pair of dichroic mirrors positioned on the optical axis of an infrared collector to produce a multipass traverse of a nonlinear crystal positioned between the mirrors by a beam of pumping radiation in order to enhance the field of view, the conversion efficiency and the resolution of the system. The crystal is placed in the optical path at the interaction area of the infrared beam and the pump beam and between the dichroic mirrors. One of the mirrors is transparent to the infrared frequency and the other is transparent to the up-converter sum frequency. Both mirrors are reflective at the pump frequency. The system may be passive and collect a thermal image or it may utilize a pulsed ir illuminator laser in conjunction with a synchronously pulsed pump laser in order to increase the output power level.

Abstract translation: 公开了一种光学上变频系统，其使用位于红外线收集器的光轴上的一对分色镜，以通过泵浦辐射束产生位于反射镜之间的非线性晶体的多次扫描，以增强 视野，转换效率和系统的分辨率。 晶体放置在红外光束和泵浦光束之间以及分色镜之间的相互作用区域的光路中。 其中一个反射镜对于红外线频率是透明的，另一个对上变频器和频是透明的。 两个反射镜在泵频率下都是反射的。 该系统可以是无源的并且收集热图像，或者它可以利用脉冲式照明器激光器与同步脉冲泵浦激光器结合，以便增加输出功率电平。