Patent ID: 6288827
Filing Date: 2001-09-11
Classification: G02F

Abstract:
A Faraday rotator comprising:a Faraday element which rotates the polarization plane of polarized light rays passing through said Faraday element when an external magnetic field is applied to said Faraday element,characterized in that the direction of said external magnetic field has been adjusted to satisfy the following conditions ""A"" and ""B"" regarding ##EQU5##that is the change of Faraday rotation angle per change of temperature, when the angle between the resultant magnetization direction of said Faraday element and the direction of the polarized light rays is represented by .alpha., the resultant Faraday rotation angle is expressed as .theta..sub.F =.theta..sub.Fmax.times.cos.alpha., wherein .theta..sub.Fmax is the maximum value of the Faraday rotation angle, which value is obtained when the magnetization direction is equal to the light ray direction, and wherein said resultant magnetization is due to said external magnetic field and said Faraday element wherein, condition A is: ##EQU6##where ""T"" represents the temperature; and, condition B is: the absolute value of one of the first amount ##EQU7##and second amount ##EQU8##is less than twice the absolute value of the other amount.