MIRcat OPERATION
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D11-00028-02-A
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47
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Wavelength trigger
A TTL pulse is generated on Pin3 of the DB-9 connector at each
wavelength step once the step size and wavelength range is entered.
8. Width, Frequency and Duty Cycle
The following sections define how to set the width, frequency and duty cycle for the MIRcat laser head
using the MIRcat GUI Laser Settings menu. The dependencies between these three values are defined by
this formula:
Duty Cycle (%) = Width x Frequency x 100
Changing the value of one parameter in this equation will cause other values to change automatically, as
defined by the table below:
Action
Width
Frequency
Duty Cycle
Change Width
As Requested
Does not Change
Changes
Change Frequency
Changes
As Requested
Does not Change
Change Duty Cycle
Changes
Does not Change
As Requested
Note: The firmware defines a maximum allowable value for pulse width and duty cycle to prevent thermal
stress to QCLs in the MIRcat laser head:
Maximum Width value
1.0 µs
Maximum Duty Cycle value
10%
