公开(公告)号：DE1589648B1

公开(公告)日：1970-07-30

申请号：DE1589648

申请日：1967-11-07

Applicant: CARY INSTRUMENTS

Inventor： BISHOP HOOPER PAIGE

IPC: G02F1/01

Abstract: 1,182,190. Light modulators. GARY INSTRUMENTS. 27 July, 1967 [13 April, 1967], No. 34563/67. Heading H4F. The subject matter of this Specification is substantially the same as that described in Specification 1,182,189 but the apparatus for modulating the ellipticity of polarization of a monochromatic light beam whose wavelength varies, so that the ellipticity varies cyclically and so that the amplitude of the cyclical variation of the ellipticity is maintained at an optimum level, which includes a modulator operable on a linearly polarized light beam to produce at least one emergent beam having cyclically varying ellipticity, and means operable upon one such emergent beam for deriving a modified beam whose intensity varies cyclically as a function of the cyclically varying ellipticity, is such that the modulator is only controlled by the modified light beam to maintain the amplitude of the cyclical variation of the ellipticity at the predetermined optimum level i.e. the modulator does not include a piezoelectric sensor and thus does not oscillate in a selfresonant manner.