消背景干扰式四路接收激光干涉仪

Elimination Background Disturbance Type of Four Acceptance Laser Interferometer

本文介绍了一种新型单频激光干涉仪,它采用偏振分光、偏振接收技术,因而克服了一般单频激光干涉仪的缺陷。在设计中又以四路全孔径接收自动消直流,使仪器发展更完善。

In universally interferometers of take unimodal frequency-sta-bilizing Laser as source.With α viewto radiation beam Character of polari-zing.Which to determine take advantage of general beam analyzer,not onlyCannot turn laser energy to full account,but also surplus harmful backgroundlight,so that,sat up a series of faults stand in the way of electrical oroptical high in break down.The present invention differs from prtor automated measuring interferometerof unimodal fnequency-stabilizing laser system in this new type of interfero-meter typically polarizing technigues are used to distinguish the measuring andstandard beam,and then there are four separate detectrors full aperture Pola-rization reception photosignal.Elimination harmful backgroud light,so that,having D.C lavel Compensation,the final two electrical signals in quadra-ture that are utilized for determining the number and direction of frimge mo-vement are made free of any D.C Rignal Component these Signals varySymmetrically about zero volts.In this new type of interferometer take advantage of half-wave plate andquarter-wave plate make up phase modulator (make an angale of 22.5° withboth opticac axis),adjust the quadrature phase.