| 摘要 |
<p>PURPOSE:To obtain the titled measuring apparatus having high temp. resistance, by constituting the same so as to measure the polarized light intensity of laser beam by irradiating optical substance to which a magnetic field or an electric field is applied with laser beam through a polarization-plane holding fiber. CONSTITUTION:The linear polarized beam emitted from a laser diode 21 is transmitted by a polarization-plane holding fiber 300 through a lens 31 and incident to Faraday rotary glass 50 while made parallel by a lens 32. Incident beam A is advance while repeatedly reflected and the plane of polarization is rotated corresponding to Verde's constant, a light path length and the intensity of a magnetic field. The emitted beam is transmitted by a polarization-plane holding fiber 400 through a lens 42 and detected by light receiving elements 81, 82 while splitted into two components crossed at right angles to each other through a lens 41 and a polarization beam splitter 90. The sum and the difference of the outputs thereof are calculated by an adding means 81 and a substraction means 82 and the ratio thereof is calculated by a dividing means 83. Because the polarization-plane holding fiber is used, a measuring apparatus having moisture resistance is obtained.</p> |
