Quantel Ultra Big Sky Laser Series User Manual page 92

88 | Contents | Troubleshooting
Problem Possible Cause
Energy is Low Flashlamp degradation
Coolant degradation
Incorrect Q-Switch delay
Misaligned
Flashlamp Trigger Trigger settings are
Delay Bypass incorrectly configured
command does not
Bypass was set to 1 (ON)
eliminate 500 µsec
during fire mode (A)
delay
Version M 22-April-2012
Solution/Suggestion
These changes are normal over time and after shot accumulation (>50 million). The pump energy
can be increased to compensate for lamp degradation. However, excessive input energy (voltage)
to the lamp must be avoided since pre-lasing and optics damage may result. If significant lamp
degradation is suspected, follow the instructions for
Operating the laser system with contaminated coolant can adversely affect energy. Inspect the
coolant. The coolant should be very clear and free from contaminants. There should be no large
particulate or organic contaminants in the coolant. Black particulate is a sign of pump wear. Green
or brown color is a sign of organic substances growing in the cooling system. If contaminated
coolant is suspected, the cooling system must be purged and properly cleaned prior to operating
the laser. Please consult Quantel for instructions on how to clean your cooling system if you
suspect organically contaminated coolant. See
for information on coolant properties.
The Q-Switch delay value is system dependent. Your system shipped with a Data Summary Sheet
specifying the correct Q-Switch delay for your system. The Q-Switch delay is set to a value in µs
with respect to the flashlamp firing (for example: 135µs).
Using an oscilloscope, connect channel 1 to the Lamp Sync BNC and channel 2 to the Q-Switch
Sync BNC. Trigger the oscilloscope channel 1. Verify that the delay from the rising edge of the
Lamp Sync to the rising edge of the Q-Switch Sync is approximately the value for your system (for
example: 135µs). If the Q-Switch delay is longer than the value listed for your system on the Data
Summary Sheet, the laser output will be attenuated.
If beam quality has degraded, it may suggest an alignment problem. Contact Quantel for details.
Flashlamp Trigger Delay Bypass is only valid when both the flashlamp and Q-Switch triggers are
configured for External Synch (E and QE respectively).
The BYPASS command only takes effect when transitioning from Stop to Fire. To resolve the issue,
press the Flashlamp Stop button on the Remote box to stop firing the laser, or send the command
"S" via the RS232 interface. Verify that BYPASS is set to 1 (ON) to bypass the flashlamp trigger
delay. Restart firing to activate the flashlamp trigger delay bypass feature.
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Ultra
Flashlamp Replacement on page
Replacing the DI Cartridge on page 72
74.