Division cavity wave length variable Fabry pero filter

摘要

It is formed vis-a-vis incidence angle from low the wave length variable Fabry pero filter which possesses sensitivity, the cavity (the air gap), by replacing with the division cavity which possesses bigger effective refractive index than as many as 1. This division cavity includes the division cavity induced electricity layer of 1 pair in the reflector of both sides of the variable air gap. As for these induced electricity layers, each one, has smaller optical thickness than as many as 1/4 of shortest wave length in the tuning range of the filter. The division cavity of 3 layer which is obtained result half integer two times the transmitted wave length in the tuning range of the filter (m) with has substantially equal effective optical thickness.