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|  MIL-T-48604(MU)
and applied to the tube assembly. The plasma tube shall lase and meet
the requirements of 3.7.2 and 3.7.3. This shall be repeated 10 times with
at least a 30 second rest between applying these over-voltage pulses.
4.7.2 Starting time. - This test shall be performed in conjunction
with 4.7.1 to determine compliance with the requirements of 3.7.2.
4.7.3 Power output. - This test shall also be performed in conjunction
with 4.7.1 to determine compliance with the requirements of 3.7.3. A cali-
brated He-Ne power meter shall be used (with an output for an oscilloscope)
to monitor the power to within 0.10 mini-watts.
4.7.4 Sustaining current. - With the voltage developed across the tube
assembly of between 1.2 KVDC to 1.6 KVDC (see Figure 1) and the power
output within the requirements of 3.7.3. The current through the tube
shall be measured to determine compliance with the requirements of 3.7.4.
4.7.5 Frequency sensitivity. - With a 75 volt peak-to-peak ripple volt-
age at a frequency varying between 5 to 25 KHZ superimposed on the input
for a period of not less than five minutes, the tube assembly shall be
subsequently subjected to the test of 4.7.1 to 4.7.4 inclusive to deter-
mine compliance with 3.7.5.
4.7.6 Beam alignment. - Beam alignment shall be accomplished by es-
tablishing a true line of sight from the geometric center of the clamping
diameter to a wall target. With the tube assembly held as shown in Fig-
ure 2, rotate the tube assembly 360 and note diameter of the circle tran-
sctibed by thelaser spot. The diameter shall not exceed that specified
in 3.7.6 (2mini-radians). - The laser beam existing from the tube assem-
bly shall be centered within 0.01 inch of the center of the clamping dia-
meter.
4.7.7 Beam roundness. - Beam roundness is required to verify TEMoo mode.
(Fundamental mode). Beam roundness is accomplished by visually observing
the projected beam using a microscope objective with at least a 1 cm aperture
and a short focal lengtth (approximately .25cm) to enlarge the beam spot. The
observed spot shall be round in shape without discontinuities in the intensity
across the diameter.
4.7.8 Beam divergence. - Beam divergence shall be calculated using
the maximum diameter as determined in 4.7,7 and the distance between the
laser tube and the wall target in the following relationship:
a. Divergence rad = d R, where:
R = distance from laser tube to wall target.
d = maximum diameter of laser spot.
The results shall not exceed the mill-radians specified in 3.7.8.
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