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Title
Vorrichtung zur polarisationsempfindlichen Spektroskopie
Date Issued
1995
Author(s)
Tacke, M.
Grisar, R.
Patent No
1993-4343663
Abstract
On devices for polarization-sensitive spectroscopy, in particular a strongly scattering sample, the fact that the scattered light is uncorrelated in its face and polarization direction with relation to the input light is exploited. In a device, a mixed beam (17,26) whose frequency is shifted by a frequency shifting device (12) and which is depolarized by a depolarization device (14) is superimposed on a sample beam (9,24) and a reference beam (6). The mixing frequency signals detected by detectors (19,29) are led to a signal mixing device (32), by means of which the scattered light which is uncorrelated with reference to phase compared with the output light (2,4) of a light source (1) can be filtered. In another device, the sample is applied to a waveguide in the form a sample layer. In an area of the sample layer adjacent to the waveguide, a modal conversion of the input light takes place, whereby the generated mode is re-injected into the waveguide, whereas scattered light propagates in all spatial directions, and thus does not produce any negative influence on the intensity of the output light of the waveguide. The two devices can be combined together to achieve particularly high scattered light suppression.
Language
de
Patenprio
DE 1993-4343663 A: 19931221