| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an electric field sensor head which has high detection sensitivity of electric field, small size and small number of connected optical fibers, and which is easy to handle. SOLUTION: The reflection-type electric field sensor head has an incident light waveguide 1, which is formed on a substrate 12 having electrooptics effects and receives the incident light; an optical fiber 8 supplying the incident light to the incident light waveguide 1; two phase shift light waveguides 3 and 4 of which the ends are connected to the incident light waveguide 1 and shift the phases of the incident light for a specific phase; and a reflector 7, placed at the other end of the phase shift light waveguides 3 and 4 and reflecting the lights from the phase shift light waveguides 3 and 4 as reflection lights to the phase shift light waveguides 3 and 4, which are supplied to the optical fiber 8, by way of the incident light waveguide 1. For the substrate 12, a ferroelectric crystal is used and the polarizing directions at the part the phase shift light waveguides 3 and 4 are set reverse to each other.</p> |
