Filtering coatings (interference filters) are designed to separate the required spectral range from the continuous radiation spectrum.
Beam-splitting coatings are designed to separate the incident beam into reflected and transmitted ones with a given intensity ratio.
Depending on the purpose, filters are subdivided into blocking (cut-off), narrowband and bandpass.
Visible and NIR coatings
KU-1 (Quartz) - HR 1.06 μm; HT 0.6-0.95μm
1.06 µm mirror with concurrent 0.6-0.95 µm high transmission.
The adhesion of the coating is checked with adhesive tape.
The coating has passed the climatic test (24 hours at a temperature of +50 degrees Celsius and a humidity of 98-99%) and mechanical durability (according to the instructions from paragraph 4.5.11 of MIL-C-675C).
The transmission of a quartz window with one surface coated is shown.
Beam splitter 0.65-1.25μm
Beam splitter for the range 0.65-1.25 μm on K8 glass.
The adhesion of the coating is checked with adhesive tape.
The coating has passed the climatic test (24 hours at a temperature of +50 degrees Celsius and a humidity of 98-99%) and mechanical durability (according to the instructions from paragraph 4.5.11 of MIL-C-675C).
The transmission of a K8 window with one surface coated is shown. Measurement is made at an angle of 21 degrees.
Bandpass filter 1.55μm
1550 nm bandpass filter with additional 1064 nm transmission on silicon.
The adhesion of the coating is checked with adhesive tape.
The coating has passed the mechanical durability test (according to the instructions in paragraph 4.5.11 of MIL-C-675C).