2-MIRROR UNOBSCURED OPTICAL-SYSTEM FOR RESHAPING THE IRRADIANCE DISTRIBUTION OF A LASER-BEAM

被引：43
|
作者：
MALYAK, PH
机构：
[1] Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, MA, 02173
来源：
APPLIED OPTICS | 1992年 / 31卷 / 22期
关键词：
IRRADIANCE REDISTRIBUTION; BEAM SHAPING; AFOCAL SYSTEMS;
D O I：
10.1364/AO.31.004377
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The design of a two-mirror optical system for reshaping the irradiance distribution of a laser beam is presented. The second mirror is decentered relative to the first to eliminate the obscuration inherent in an axially symmetric design. A geometric-optics approach is used to derive a set of equations that describe the surface figures of each of the mirrors. (In general, the mirror surfaces are not rotationally symmetric.) The special case of a system to convert a Gaussian input beam into a uniform output distribution is considered. The expressions for the surface figures are evaluated numerically for several specific systems to provide illustrative examples. It is observed that in some cases rotationally symmetric aspheres may be used to construct the beam-shaping system.
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页码：4377 / 4383
页数：7
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