| CPC G02B 5/208 (2013.01) [G01K 11/006 (2013.01); G01T 1/1606 (2013.01); G02B 1/04 (2013.01); G01J 5/0802 (2022.01)] | 20 Claims |

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1. A co-axial infrared filter comprising:
a body having
a wall forming an outer conductor characterized by a filling hole, and
a cylindrical central cavity having an open first end and an open second end; and
a first Subminiature version A (SMA) connector mechanically coupled to the open first end of the body and a second SMA connector mechanically coupled to the open second end of the body, wherein a respective connector pin of each of the first SMA connector and the second SMA connector are positioned along a long axis of the body and electrically coupled proximate the filling hole to define an inner conductor.
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