OPTICAL ELEMENT AND OPTOMAGNETIC FIELD DETECTION SENSOR

摘要

PURPOSE:To reduce an attenuation factor of transmission light in substance by laminating singe crystal elements right and left in optical rotation at the right angle to the direction of transmitting light to minimize a reflection rate of the transmission light on an end face of the singe crystal elements. CONSTITUTION:Optical elements employ Bi12SiO20 and B12GeO20 and the like. They are a single crystal element having a right optical rotation and a magnetooptical rotation and a single crystal element with a left optical rotation and magnetooptical rotation respectively. To facilitate the assembling, a relative angle of inclination is set at 45 deg. between a polarizer 4 and an analyzer 6 sandwitching an optical element 2 and to detect the intensity of a magnetic field at the maximum sensitivity, the length of the crystal elements is adjusted to lR for the element 2R and lL for the element 2L so that a natural angle of rotation psi of transmission light of each signal crystal element reaches a multiple of 90 deg.. This enables detection of the intensity of a magnetic field and a current generated by the magnetic field at the maximum sensitivity and without detection errors attributed to a change in temperature from the intensity of light as received with a receiver 8 via the analyzer 6.