Miniature narrow-band filter for multistage filtering
A narrow-band filter and narrow-band filtering technology, applied in the direction of instruments, light guides, optics, etc., can solve problems such as limiting the application range of narrow-band filters, achieve narrow line width, good reliability and stability, and achieve tuning effects
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[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0028] Figure 4 It is a structural schematic diagram of a miniature narrowband filter for multi-stage filtering in an embodiment of the present invention, and the miniature narrowband filter includes: an input collimator 51, a primary filter 3, an FP cavity 2 and an output collimator 52, wherein:
[0029] The input collimator 51 is used to transmit the input optical signal to the primary filter 3 through free space after beam expansion;
[0030] The primary filter 3 is used to transmit the optical signal transmitted from the input collimator 51 to the FP cavity 2 through free space after primary filtering;
[0031] The FP cavity 2 is used for narrow-band filtering the optical signal filtered by the primary filter 3 and ...
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