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Manual Interrupt Procedure
1. Close the shutter.
2. Resume operation by opening the shutter again. Laser will resume operation
NOTE:
Shut Down Procedure
1. Close the shutter to stop lasing.
2. Turn off the diode drive current. The laser diodes cease emission.
3. Turn off TEC controller.
4. Turn off chiller.
Output Power Control
Every laser application requires specific laser power settings for the best results. In some
cases, the output power has to be changed at different stages even in the same laser
process. Typically, the output power of a laser can be varied by changing the operating
current. However, the active laser crystals can exhibit strong thermal lensing, which is
related to the operating current. Variation of the operating current results in the change of
the thermal lensing. Therefore, the position of the focal point moves as the pump current
is varied. This is not desirable for most laser applications especially laser micro-
machining.
The output power of Iklwa laser can be changed either by changing the operating current
or by changing the Q-switch power. This unique, patented technology allows users to
adjust the laser output power continuously without changing the operating current. The
focal point is kept at the same position regardless of the power level. This feature is very
useful for precision micro-machining requiring different power levels to complete the
process.
External Triggering and FPS
The laser may be externally triggered using a TTL signal of 300 ns to 500 ns duration.
Figure 4-15 illustrates the RF signal output to the Q-switch without first pulse
suppression (FPS) and the laser pulse train with the first giant pulse. If the peak power of
these giant pulses is high enough, it can cause the damage to the mirrors and the laser
crystals. The giant pulse forms when the lasing was stopped while the pumping light is
still on during the laser processing cycle. The amplitude of the giant pulse is dependent
on the non-lasing duration as well as the operating current.
© 2019 Cutting Edge Optronics, Inc.
Approved for Public Release; NG19-2099
with no audible warning.
The laser diodes are operated at set pumping current while the shutter is closed.
Chapter Four: Installation and Operation
32
Iklwa Laser User Manual
CEO-UMAN-0055E
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