MIL-DTL-62422D(AT)
3.4 Environmental weathering. Filters shall evidence no detonation or other physical
deterioration when exposed to an irradiance level of 1120 Watts per square meter (W/m2)
(355 British thermal units per square foot per hour (Btu/ft2/h)) and shall subsequently meet the
requirements of 3.5.1 through 3.5.8 (see 4.5.2).
3.5 Optical characteristics.
3.5.1 Optical density. The optical density of the filter shall be equal to or greater than
the value specified in table I for all angles specified and for incident radiation in both "P" and
"S" polarization states (see 4.4.3 and 4.5.3).
TABLE I. Optical density (O.D.).
Wavelength,
O.D. with angle
Unity device
(nm) 1/
(0 to 80) +/-1.5 degrees
w/filter
A
694
3.4
3.5
B
1048-1068
3.4
3.5
C
1064
3.4
3.5
1/ Nanometers (nm)
3.5.1.1 Ruby coating characterization. The ruby blocking coating shall be spectrally
characterized from 680 nm to 880 nm and shall have an optical density equal to or greater than
2 from 680 nm to 880 nm (see 4.5.4).
3.5.2 Photopic transmission. The photopic transmission of the filter shall be at least
65 percent at an angle of incidence of 0±1.5 degrees and at least 40 percent at angles of
incidence up to 50±1.5 degrees (see 4.4.3 and 4.5.5).
3.5.3 Chromaticity. The transmission spectrum of the filter at 0±1.5 degrees shall have
chromaticity coordinates (x, y) that fall within the chromaticity curve as specified in
ASTM E308 and the region bounded by the rectangle whose coordinates shall be:
x, 0.423±0.030 and y, 0.433±0.030 (see 4.4.3 and 4.5.6).
3.5.4 Resolution. The resolution through the filter shall be less than one minute of arc
(see 4.4.3 and 4.5.7).
3.5.5 Filter coating durability. The coating shall be capable of operation under adverse
environmental conditions without any evidence of flaking, peeling, cracking, or blistering
(see 4.5.8). The coated surface shall be free of blemishes such as stains, smears, discolorations,
streaks, and cloudiness.
3.5.6 Surface quality.
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