Trichroic mirror
AssigneeInternational Telephone and Telegraph Corporation
InventorGerald Jankowitz
Life of this patent
Estimating the term…
Abstract
A trichroic mirror comprising an optical wedge having two multilayer dielectric interference filters, one disposed on a front surface of the wedge and the other disposed on a back surface of the wedge with the back surface being tilted in a given direction and at a given wedge angle with respect to the front surface, and a reflecting element spaced from the back surface and tilted in a direction opposite to the given direction and at an angle equal to the given wedge angle with respect to the front surface. This mirror separates incident radiation into three spectral bands, all of which may be detected by a single detector in time sequence.
Claims12
A trichroic mirror comprising:
- an optical wedge having a first multilayer dielectric interference filter disposed on a front surface of said wedge and a second multilayer dielectric interference filter disposed on a back surface of said wedge, said back surface being tilted in a given direction and at a given wedge angle with respect to said front surface;
- and
- a reflecting element spaced from said back surface and tilted in a direction opposite said given direction and at an angle equal to said given wedge angle with respect to said front surface.
A trichroic mirror comprising:
- a dichroic mirror having a back surface and a front surface upon which broad band radiation is incident;
- and
- a reflecting element spaced from said back surface and tilted at a given angle with respect thereto;
- said dichroic mirror and said reflecting element cooperating to produce three separate reflected beams.
Dependencies are inferred from the claim text.