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CHAPTER 6: OPERATING INSTRUCTIONS
Waveform Control
The LW250 Laser generates a waveform (pulse shape), as shown in Figure 6-2, by combining
the flash lamp pulse duration (FLASH1, FLASH2, FLASH3), interval time (COOL1, COOL2)
and the voltages (VOLTA, VOLTB). The voltage can be set to either VOLT A or VOLT B.
L25VOLT.WPG
Figure 6-2. Waveform Composition
You set the pulse duration of the flash lamp as follows:
0.3 msec
FLASH1 + FLASH2 + FLASH3
20 msec
Laser Output. Refer to Figure 6-3.
If VOLT A and VOLT B are set to the
same amplitude, SW-A and SW-B are
closed simultaneously regardless of the
absolute amplitude of VOLT A and VOLT
B. Thus, if a single laser beam shot is
emitted (with no waveform control) when
VOLT A and VOLT B have the same
amplitude, the total capacitance is double
(Laser Bank A + Laser Bank B) the
capacitance obtained when VOLT A and
VOLT B are not equal. Thus, a larger laser
output is obtained (see Figure 6-4).
L25FLASH.WPG
Figure 6-3. Capacitor Bank Switching
LW250 PULSED Nd: YAG LASER
990-605 REV B: May, 1997
6-5
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