MULTILAYER OTICAL BANDPASS FILTER Russian patent published in 2015 - IPC G02B5/28 B82Y20/00 

FIELD: physics.

SUBSTANCE: filter contains half-wave layers of dielectric which are resonators, and adjoining to them multilayered dielectric mirrors separating one resonator from another and from surrounding space, all together forming a symmetric structure. The period of i^th multilayered dielectric mirror is expressed by the structure AB_iC_iB_i, where A, B_i, C_i - three layers of dielectrics with indices of refraction n_A>n_B>n_C identical in all multilayered dielectric mirrors. A layer in all multilayered dielectric mirrors has the electric thickness θ_A=π/2, and electric thicknesses θ_Bi and θ_Ci of dielectric layers Bi and Ci depend on the location of the multilayered dielectric mirror and comply with the uniform condition $$tg2{\theta }_{Bi}tg{\theta }_{Ci}=2n_B{n}_C/(n_B^2+n_C^2).$$

EFFECT: possibility of implementation of practically any required width of the pass-band of the filter and reduction of unevenness of coefficient of passing of light in this band.

3 cl, 6 dwg, 3 tbl