Figure 3-5: Example Of Laser Performance Dependence On The Shg Temperature - NORTHROP GRUMMAN Iklwa II TEM00 Service Manual

Figure 3-5: Example of Laser Performance Dependence on the SHG Temperature

6. Peak the laser power by increasing the current. Search for the peak power by
Figure 3-5 illustrates an example of the dependency of the output power and
pulse-to-pulse instability of the laser to operating current. Notice that the laser
power increases as the operating current is increased. The laser reaches peak
power around 23 A. In this example 23A is the rollover current, and the operating
current would be 22.5 A to 22.7 A. Fine-tune the current to optimize pulse-to-
pulse stability and roundness.
The slight difference between the actual operating current and the test report value
may be due to the performance difference of the chillers. An increase in the
operating current can compensate for the aging of the laser diodes.
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changing the current 0.1 A increments around the operating current. Once the
peak power is found, lower the current to reach 99.5 percent of the peak
power.
Chapter 3: Tuning and Testing Procedures
44 Patara II and Iklwa II Service Manual