Novanta 32-1 Laser, Руководство пользователя

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CONTROL SIGNALS PAGE | 32
Control signals
• Control signals
• Operating modes
Much of the information provided in this section describes the use of a NOVANTA® UC-2000 Universal
Laser Controller to provide tickle and PWM signals to the laser. If you are using an alternate method of
laser control, thoroughly review this section for an understanding of the signal requirements necessary to
control NOVANTA 32-1 lasers. The table below lists input voltage and current specifications for 32-1 (PWM)
inputs. Tables above and below provide specific tickle pulse and PWM signal parameters.
Table 4-3 Input signal specifications.
Tickle pulse
32-1 lasers require a 1 μ s tickle pulse delivered at a nominal 5 kHz clock frequency from the Controller.
Tickle pulses pre-ionize the laser gas to just below the lasing threshold so that any further increase in pulse
width adds enough energy to the plasma to cause laser emission. This tickle signal causes the laser to
respond predictably and almost instantaneously to PWM signals, even when there is considerable delay
(laser off time) between applied PWM signals. The lase threshold is preset for 3
μ
s ±0.5
μ
s based on a
PWM and tickle frequency input of 5 kHz. See the following table for tickle specifications.
Table 4-4 Tickle pulse specifications.
Caution: Possible Equipment Damage
Applying PWM pulses directly to the laser without first sending tickle pulses, for at least two seconds,
will cause unpredictable laser emission, degrade optical rise time, and may lead to RF Driver failure.