Chapter One: Introduction
© 2019 Cutting Edge Optronics, Inc.
5
Iklwa Laser User Manual
Approved for Public Release; NG19-2099 CEO-UMAN-0055E
Voltage - Max
14.4V
Resistance (Ohms)
6.31
Delta Tmax @ Th
67° C at 25° C
Shutter Drive
: the shutter requires 14VDC to turn on. When there is not voltage applied
to the shutter, the shutter blocks the laser cavity.
RF Power
: the nominal setting for 27 MHz RF power is 25 W. The window width
should be 5 µs. The window width is the width of the gap in the RF modulation envelope.
Laser on Indicator
: the Laser on Light requires 24VDC. The light should be illuminated
when diode current is turned on. Keep isolated from other circuits.
Cover Interlock
: there are two cover interlocks wired in series. When the cover is in
place, the shutter interlock switches are closed. When the cover is removed, the shutter
interlock switches are open. The cover interlock switch can be pulled up to defeat the
cover interlock when servicing the laser.
Flow Switch
: the flow switch is normally open circuit when no cooling fluid is flowing
through the Iklwa laser head. When there is at least one gallon per minute of coolant
flowing through the Iklwa laser head, the flow switch electrical contacts close.
Northrop Grumman will provide the required diode array current, diode array voltage,
chiller temperature, and TEC temperature operating parameters on the test report supplied
with the laser.
Thermal Control Subsystem
Thermal control and heat removal from the laser transmitter is accomplished by the
chiller. The laser is equipped with an integral flow switch that should be used to interrupt
drive current to the amplifier module and power to the Q-switch when the flow rate falls
below 1 gpm (3.8 lpm). Flow direction is labeled on the laser optics housing below the
coupler ports. Please observe the flow direction at all times. Please see the chiller set up
section for more details.
The thermal control system must be capable of maintaining the temperature set point to
±0.1 ºC with a flow rate of 1.5 gpm (5.7 lpm). An input pressure of approximately 49 psi
is required at the laser housing. Chiller pressure may be several psi higher if additional
filtering, flow metering, fittings, and long runs of coolant tubing are used.
Coolant used in the system must be compatible with the materials used in the internal
coolant lines of the laser. Tap or de-ionized water must be avoided because of corrosion
and mineral deposits. Northrop Grumman can supply an approved coolant for this
application.
