Optics: measuring and testing – By polarized light examination – With birefringent element
Patent
1999-10-08
2000-12-05
Font, Frank G.
Optics: measuring and testing
By polarized light examination
With birefringent element
356366, 356367, G01J 400
Patent
active
061574481
ABSTRACT:
The object of the present invention is to measure the amount of birefringence of a target while enhancing spatial resolution. A birefringence measurement optical system is comprised of a Stabilized Transverse Zeeman Laser emitting laser beam in a predetermined polarization state toward a target, a halfwave plate (polarized light emission optical system), a linear polarizer (polarized light detection optical system) detecting information on the retardation, main axial direction and optical rotation angle of the target as a light signal which can be polarimetrically analyzed through the target, and a photo detector converting the light signal from the linear polarizer into an electric signal and detecting the electric signal. An optical fiber (light transmission path) taking out part of light fluxes of the light signal and optically transmitting the part of the light fluxes from the target toward the photo detector, is arranged between the photo detector and the target.
REFERENCES:
patent: 4681450 (1987-07-01), Azzam
patent: 4904863 (1990-02-01), McDearmon
patent: 5726744 (1998-03-01), Ferdinand et al.
patent: 5864403 (1999-01-01), Ajji et al.
Kowa Hiroyuki
Mochiduki Shinji
Umeda Norihiro
Font Frank G.
Punnoose Roy M.
Uniopt Co., Ltd.
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