| 摘要 |
PURPOSE:To obtain the small-sized polarization plane rotating element with high performance by controlling a temperature control means on the basis of the output of a transmitted light monitor, and specifying the distance between both reflecting films through the thermal expansion of a magneto-optic medium and increasing magneto-optic effect. CONSTITUTION:Linear polarized light 1 with wavelength lambda which is incident in a (z) direction is reflected several times between reflecting films 3 and 3' provided on both end surfaces of the magneto-optic medium 2' which induces an angle theta0 of Faraday rotation when light passes through the magneto-optic medium 2' in the presence of an impressed external magnetic field 5 while the plane of polarization is rotated, and the light is projected as the sum of respective reflected light electric field vectors. The distance l between the reflecting films is adjusted to an integral multiple of lambda/2 and then the angle theta of Faraday rotation increases the value that the magneto- optic medium 2' has originally. A heater is wound around a resonator so as to the work accuracy of the magneto-optic medium 2' nearly as high as the wavelength of the light, and the thermal expansion due to the temperature rise of the magneto-optic medium 2' is utilized to adjust the distance l between the reflecting films. |
