Chapter 3: System Details
© 2018 Cutting Edge Optronics, Inc.
13
Patara I and II Laser User Manual
WARNING.
The screws filling the alignment hole are considered non-interlocked covers.
If the screws are not replaced and the Patara II laser is running, the opening will function
as an aperture. It can allow an output beam of up to 3 W at the same rep rate and pulse
width as the main beam. This beam would be capable of causing eye or skin damage
from direct exposure or specular reflection of the beam. Always replace the screws in the
alignment holes.
WARNING.
Additional adjustment holes in the top cover of the laser housing provide
access to the HR cavity mirror and HM cavity mirror. The access holes should be always
covered unless an alignment is being performed. Dust particles can cause damage to the
mirrors and crystals inside the laser. All the holes on the laser enclosure should be
sealed all times to prevent moisture penetration. Moisture in the enclosure can degrade
the lifetime of SHG crystal as well as the coatings on all optical components.
Figure 3-3. Patara II Top View
Closed Loop Chiller
The single most common cause of a laser returned for repair involves customer
damage. More than one third of these damaged lasers result from cooling
problems. Coolant problems almost always require the replacement of the diode
arrays—the single most expensive component in Northrop Grumman lasers. This
section describes how to avoid damaging arrays.
WARNING.
Do not operate laser without cooling. Inadequate heat dissipation will
seriously damage the laser diodes and will void warranty.
Table 3-1. Heat Capacity and Minimum Flow Rate
Model
Heat Capacity
1
Minimum Flow Rate
PA-020-QTG
800 W
1.5 gpm (5.7 lpm)
1
Heat c
apacity should be greater than the laser’s power consumption.
