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OWNERS MANUAL | Cobolt 08-01 Series | D0141-K SEPTEMBER 2020
High Current
The high current defines the drive current the laser diode will modulate up to while in
modulation mode. The default factory setting is the current needed to reach nominal output power in the
ON
state.
It is not always sufficient to increase the TEC_LD
mod
temperature to achieve maximum average power.
When necessary the High current level can be increased up to as much as 3000 mA, the maximum safe operating
current for 06-DPLs as set at the factory.
TEC LD
mod
The TEC LD
mod
temperature can be adjusted to optimize the laser
’s
modulation performance in
application.
The 06-DPLs optical output power is influenced heavily by
the match between the pump diode’s emission
spectrum and
the laser crystal’s gain spectrum
. Modulation mode operation is achieved by direct modulation of the
drive current to the pump diode. Decreasing the ON time and thereby the diode temperature, must be compensated
by an increase in the platform temperature to maintain a constant pump diode wavelength. TEC_LD
mod
is a ‘virtual
TEC’ used to control the platfor
m temperature when in modulation mode and can be used to optimize the temperature
of the pump diode. Adjust the TEC_LD
mod
temperature inversely with duty cycle.
Thermal compensation for wavelength shift in modulation mode
