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17
Co
Brite
User Manual
4.6
Laser modes
Coarse tuning allows accessing the full specified tuning range while fine tuning (FTF) allows for
offsetting from the coarse tuning set point by a small range. The resulting set point is the sum of
coarse tuning set point and FTF/fine tuning value.
4.6.1
Coarse tuning
This tuning mode allows tuning the laser to any frequency of the available range specified for
the laser port. The tuning process will require the output to be disabled for a short period of
time.
Description of tuning process:
1. Output will be switched off (~1 second)
2. Output is switched on using new frequency
3. Power is increased until final output power is reached. Maximum tuning times for this
step differ from laser type to laser type.
4. Power is stabilized, tuning process is completed.
Note that the time to tune the laser is the actual time required to tune the laser, the software
based tuning indicator may indicate a tuning state for a longer time period than the actual tuning
requires.
4.6.2
Fine tuning (FTF)
Fine tuning allows detuning the laser within a small range from the target frequency set using
the coarse tuning parameter. The laser will detune to the target setting with output power on
during the tuning process which changes the output frequency in a linear ramp.
1.
–Tuning is triggered
time
Power
time
Freq
ue
nc
y
Wa
vele
ng
t
1
2
3
4
f
f
max
f
min
1. Coarse tuning setpoint
2. fine tuning range
f
f
max
f
min
