Title:
MEASURING METHOD FOR OPTICAL WAVELENGTH
Document Type and Number:
Japanese Patent JPH01113626
Kind Code:
A
Abstract:
PURPOSE:To make it possible to measure wavelengths highly accurately with a device of one system, by casting light from a light source into divided photosensors through a birefringence plate, wavelength plates having difference characteristics, and a birefringence plate. CONSTITUTION:Light emitted from a light source 1 becomes parallel light beams through a collimate lens 2. The light beams are incident into a birefringence plate 3 made of calcite. Linearly polarized lights, which are separated into a normal light beam A and an abnormal light beam B, are outputted from the birefringence plate 3. The light beams are incident into wavelength plate 7 comprising wavelength plates 7' and 7'' having the different characteristics. Circular polarized light and elliptical polarized light C and D having the different phases are outputted from the wavelength plates 7' and 7''. The polarized lights C and D are incidented into a birefringence plate 5 made of calcite. Thus, the normal light beams E and G and the abnormal light beams F and H of the polarized light C and the polarized light D are obtained. They are received with divided photosensors 8. An extinction ratio is computed based on the intensities of the received light beams. The wavelengths of the light source 1 is measured with the extinction ratio.
Inventors:
ASANUMA NOBUHISA
IGARASHI YASUTAKA
IGARASHI YASUTAKA
Application Number:
JP27135587A
Publication Date:
May 02, 1989
Filing Date:
October 27, 1987
Export Citation:
Assignee:
TOYO COMMUNICATION EQUIP
International Classes:
G01J9/00; G02B27/28; (IPC1-7): G01J9/00; G02B27/28