OWNERS MANUAL | Cobolt Skyra™ |
D0423-E JANUARY 2018
15 | 45
Modulation Quick start
On the back side of the laser head there are 8 SMB connectors. Each of the four laser lines can be modulated individually
using both analog and/or digital modulation. Laser 1 is always a Diode pumped laser (DPL). Laser 2, Laser 3 and Laser
4 are Modulated laser diode (MLD) type lasers. There are some critical differences in the control electronics that have
an impact the modulation parameters and inputs specified in Section 7.1.1 : Modulation.
Settings
Low Current
The low current defines the drive current the laser diode is set to in the OFF state while in modulation
mode. This level can be adjusted to be more suitable for a particular application but in the case of
Laser 1: DPL there can be consequences to the pulse shape.
Laser 1 : DPL
Just below the lasing threshold, factory set
Laser 2,3 and 4 : MLD
0
mA, factory set
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.
TEC 3
The TEC3 temperature can be adjusted during modulation. This value is factory set to optimize
performance at 1 kHz digital modulation with a 50% duty cycle on Laser 1.
For more detailed instructions on how to adjust the above parameters see section See section 9 : Modulation mode
operation
