An electrically tunable optical filters insensitive to polarization state of incident light
A polarization state and optical filter technology, applied in the field of optics, can solve the problems of restricting the application of electrically tunable optical filters, the full-height half-width of the transmission spectrum, and the thickness of the liquid crystal cell, etc., to achieve a large adjustment range of the transmission wavelength and a short response time , half-height full-width small effect
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[0023] Such as figure 1 As shown, an electrically tunable optical filter insensitive to the polarization state of incident light includes a first Fabry-Perot interference cavity 1 and a second Fabry-Perot interference cavity 2 . The incident light enters the first Fabry-Perot interference cavity 1 to be filtered for the first time, and then enters the second Fabry-Perot interference cavity 2 to be filtered for the second time.
[0024] Both the first Fabry-Perot interference cavity 1 and the second Fabry-Perot interference cavity 2 are liquid crystal cells that can be driven by a power supply.
[0025] The first Fabry-Perot interference cavity 1 includes two glass substrates (3-1, 3-2) separated by a certain distance, defining two opposing glass substrates (3-1, 3-2). The surface is the inner surface of two glass substrates, the inner surfaces of the two glass substrates are parallel to each other, the light incident direction is perpendicular to the inner surfaces of the two...
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