Patent ID: 8855149

Claim:
A Fabry-Pérot tunable filter device, comprising: a first and a second reflecting element separated by an optical path length to form an optical resonator cavity, and a first actuator means, said first actuator means being: a) directly coupled with said first reflecting element, or b) indirectly coupled with said first reflecting element via a supporting member supporting said first reflecting element, wherein the first actuator means is configured to modulate the optical path length between said first and second reflecting elements by a modulation amplitude to thereby sweep the optical resonator cavity through a band of optical resonance frequencies with a sweep frequency of 70 kHz or more, wherein the tunable Fabry-Pérot filter device is further characterized in that the mechanical coupling between at least two elements out of the first actuator means, the first reflecting element and the supporting member is such that said at least two elements when operated at said sweep frequency of 70 kHz or more act as a system of coupled oscillating elements, and wherein the amplitude of the oscillation of the reflecting element is larger than that of the first actuator when operated at said sweep frequency of 70 kHz or more.