Laser features
28
Koheras ADJUSTIK & ACOUSTIK
If the module is used within either the ADJUSTIK or ACOUSTIK chassis, auto-start
is overruled and cannot start laser emissions even if the auto-start bit is set.
KeyUpdater
To enable/disable the Auto-Start feature, use the KeyUpdater tool with either
key below.
• Enable key – enables the Auto-start feature
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• Disable key – disables the Auto-start feature
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Emission delay The laser has an Emission Delay register which is set to 1.5 seconds by default.
When emission is enabled, the emission LED on the front of the module and the
emission output pin of the electrical interface will immediately indicate emission.
However with this feature, the emission of actual laser light is delayed by the
time set with the register. See “Setting the emission delay” on page 75.
Shutdown delay This feature delays disabling laser emission by 100 ms after the interlock/enable
pins (See “Main electrical Interface” on page 24) are set to low or a disable
command is sent. When the laser is integrated with an amplified system, the
shutdown delay ensures the laser’s seed signal does not disappear before an
interfacing amplifier is turned off.
High temperature
shutdown
To prevent thermal run-away when the laser module temperature exceeds 65 °C,
the emission is automatically turned off. The high temperature shutdown feature
uses the thermal control function inside the laser to turn off the emission.
Note: The laser remains ON and has communications enabled, only the emission
is turned off by the feature.
Auto-Start
If after the high temperature shutdown feature turns off emission, the module
temperature subsequently drops below 60 °C, laser emission is automatically re-
initiated. This only occurs when laser emission was enabled before high
temperature shut down and auto-start are enabled.
Power verification This feature internally monitors the output power level from the fiber stage. If
power drops below a predefined level in relation to the measured pump current,
laser emission is automatically shut off.
Note: The slope is different for each individual laser as their emission efficiency
varies.
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