TUNABLE OPTICAL FILTER AND TUNABLE OPTICAL FILTER MODULE

摘要

A tunable optical filter with an optical axis is provided. An input light field moves forward from an upstream end to a downstream end, and passes through the tunable optical filter to form an output light field. The input light field has a main frequency range and a sub-frequency range, and the output light field has the main frequency range. The tunable optical filter includes an optical filtering element and a temperature controlling assembly. The optical filtering element has a lens body, a first and second coating films. A resonant cavity with a cavity length is formed inside the lens body. The temperature controlling assembly is thermally connected with the optical filtering element. The temperature controlling assembly controls the temperature of the optical filtering element to adjust the cavity length, so as to select the main frequency range. A tunable optical filter module having the tunable optical filter is provided.

主权项

1. A tunable optical filter, having an optical axis, wherein an input light field moves forward from an upstream end to a downstream end of the optical axis, and passes through the tunable optical filter to form an output light field, the input light field has a main frequency range and a sub-frequency range, and the output light field has the main frequency range, the tunable optical filter comprising:
an optical filtering element, having a lens body, a first coating film and a second coating film, wherein the first coating film and the second coating film are respectively disposed on a first surface and a second surface of the lens body opposite to each other, and a resonant cavity with a cavity length is formed inside the lens body; and a temperature controlling assembly, thermally connected with the optical filtering element, wherein the temperature controlling assembly controls the temperature of the optical filtering element to adjust the cavity length, so as to select the main frequency range.