Technique for eliminating undesirable reflections from optical systems

摘要

Undesirable reflections from an element in an optical system are eliminated by passing incoming light through a polarizer and a 45 DEG optical rotator before it strikes the reflective element. The reflected light component is again rotated 45 DEG by the rotator, for a total rotation of 90 DEG , whereupon it is blocked from leaving the system by the polarizer. Alternatively, a quarter wave plate or other circular polarizing component may replace the rotator to result in a net rotation of the polarization of the reflected light by 90 DEG .