MIL-DTL-62422D(AT)
illuminated and examined with a 3X minimum magnifier. Any visual damage constitutes failure.
The energy density values specified in table V are maximum energy density values. For
gaussian energy distribution, the maximum energy density is twice the average energy density.
The average and maximum energy density shall be determined as specified in 4.5.10.1 and
4.5.10.2, respectively.
TABLE V. Laser damage test parameters.
Energy density
Wavelength (nm)
Repetition rate (Hz) 2/
(mJ/cm2) 1/
≥ 500
694
0.2+10%
≥ 650
1064
2.5+10%
1/ Millijoules per square centimeter (mJ/cm2)
2/ Hertz (Hz)
4.5.10.1 Average energy density. The average energy density shall be given by:
Q
Havg =
A2
where Q is the total pulse energy and A2 is the area bounded by the 1/e2 intensity points.
4.5.10.2 Maximum energy density. The maximum energy density shall be given by:
Q
Hmax =
= 2Havg
A1
where Q is the total pulse energy and Al is the area bounded by the 1/e intensity points.
4.5.11 Temperature stability. At least one filter per manufacturing lot shall be tested for
compliance to 3.5.8. The filter shall be allowed to stabilize at -40±5 °F for a minimum of
six hours and then the optical density shall be measured at the center of the filter for light
incidence of 80±1.5 degrees as specified in 4.5.3.2, except that the collimated beam diameter
incident on the filter shall be 4.8±1.7 mm (1/e2). The filter shall than be returned to room
temperature (70+10 °F) for a minimum of six hours and then allowed to stabilize at 140±5 °F at
a maximum relative humidity of 10 percent for at least six hours and then the optical density
shall be measured at the center of the filter for light incidence at 80±1.5 degrees as specified in
4.5.3.2.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as
specified in the contract or order (see 6.2). When packaging of materiel is to be performed by
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