Tunable Coherent Light Filter Using Michelson Interferometer

The patent applies dynamics by making the filter wavelength tunable through mechanical adjustment of the etalon spacing. The etalon's optical path difference can be dynamically changed by moving the mirrors, allowing the filter to track moving laser wavelengths rather than being fixed at a single wavelength. This resolves the contradiction by enabling both effective filtering and adaptability to changing jamming conditions.

The patent changes the optical parameters of the filter by adjusting the physical spacing between etalon mirrors. By varying this spacing parameter, the filter wavelength can be tuned across different values, transforming a static filter into a dynamic one that can adapt to moving laser wavelengths while maintaining filtering effectiveness.

The patent segments the interferometer into a compact folded configuration using beam splitters and multiple reflection paths. This segmentation allows the optical path length to be extended without increasing the physical footprint or alignment complexity, as the light path is folded back on itself within a confined space rather than requiring a long linear path.

The interferometer employs nested reflection paths where light bounces between multiple mirrors and beam splitters in a compact arrangement. This nesting of optical paths within a small physical volume allows for long effective path lengths needed for coherent light rejection without proportionally increasing device complexity or alignment difficulty.