Title:
【発明の名称】複屈折測定装置
Document Type and Number:
Japanese Patent JP2792315
Kind Code:
B2
Abstract:
The birefringence of an object is measured by emitting first and second linearly polarized laser beams having optical frequencies f1 and f2 and transmitted in a same z-axis direction. The directions of polarization of the two laser beams are perpendicular to each other. After passing through the object, the laser beams are separated irrespective of the polarized directions thereof. A first analyzer transmits therethrough one of the laser beams that has been separated and polarized by about 45 DEG with respect to the x-axis. A second analyzer transmits therethrough the other of the laser beams separated and polarized in the x-direction or y-direction. Respective photodetectors are provided for detecting the outputs of the first and second analyzers. The birefringence amount of the object and the direction of a lag-phase axis or of an advanced-phase axis is detected based on the outputs of the photodetectors and a difference in the frequencies f1 and f2 of the first and second laser beams.
Inventors:
YOSHIZUMI KEIICHI
KUBO KEIJI
KUBO KEIJI
Application Number:
JP5111492A
Publication Date:
September 03, 1998
Filing Date:
March 10, 1992
Export Citation:
Assignee:
MATSUSHITA DENKI SANGYO KK
International Classes:
G01N21/23; (IPC1-7): G01N21/23
Domestic Patent References:
| JP283428A | ||||
| JP6361936A | ||||
| JP545278A |
Attorney, Agent or Firm:
Tomoyuki Takimoto