MIRcat OPERATION
•
D11-00028-02-A
Page
41
of
54
before clicking the Save Settings on the bottom of the screen and all changes will be saved.
The “Re-Initialize Tuning” button allows the user to reset the tuning index on the currently selected QCL.
This will force the QCL motor to find home index, rather than re-booting the entire system.
The “Wavelength (WL:)” meter shows what percent of full tuning the QCL is currently tuned to. A negative
number indicates the motor is out of normal tuning range on the index mark and is a normal operation.
The ‘%’ field below this indicates what percentage of full current the QCL is set to. For example, if the
maximum current is 750mA, then the indicator should read 100%. This helps the user know if the QCLs are
set to maximum allowed current.
NOTE:
Users must click the Save Settings button to save the changes before leaving the screen.
Laser Modes are selected using the pull-down menu. If the modes are not available, or not installed, then
the selections are not displayed. Newer versions of MIRcats have CW-modulation, and selectable noise
filters for CW performance. CW-Modulation is described in
Sec IV-9 Modulation Functions (CW)
. The CW-
Filter Mode 1 reduces the laser driver corner frequency to 14KHz which in turn reduces the CW laser RIN
about 5 dB (typical). This setting allows for some limited modulation of the laser (limited by the 14KHz
corner). CW-Filter Mode 2 reduces the laser driver corner frequency to 3Hz which reduces the CW laser
RIN by about 20 dB (typical). At this setting, laser modulation is not feasible.
Process Trigger Modes
- These modes affect Sweep Scan, Step and Measure Scan and Multi-Spectral Scan
modes. The DB-9 Pin 4 is active LO. This signal is only used when “Use External Step Mode” is selected. In
Sweep Scan mode, the laser will set up the requested sweep and wait for Pin 4 to go LO before starting the
