Vescent Photonics
D2 Series Product Manual
Cable Connector
The connections to the TECs and thermisters are made to an 8-pin circular connector. The pin
definitions are:
Pin
Signal
1
TEC1+
2
TEC1-
3
Rth-1
4
Rth1-RTN
5
TEC2+
6
TEC2-
7
Rth2
8
Rth2-RTN
NOTE: Earlier models use a push-pull connector for the 8-pin connector to the DBR module. To remove
take care to apply opposition forces with the thumb and forefinger knuckles against the housing.
Excessive force could displace the output beam and require realignment.
Laser Current (SMA)
Current is provided to the DBR chip through an SMA connector. The central conductor of the
SMA connects to the laser anode, and the shield connects to the laser cathode.
This is a direct,
unprotected connection to the DBR chip, so care must be taken to avoid ESD damage.
1.4.
Aligning the DBR Laser Module
The module should not need adjustments, but if necessary the following procedure can be used to fine
tune the beam positioning.
1. Loosen the three locking screws on the back of the DBR module ½ turn past the crack point.
2. With a 0.050” Allen driver, adjust the vertical adjustment setscrew on the top of the DBR housing
to level the beam.
3. Adjust the horizontal adjustment 4-40 set screw on the left side of the DBR housing (See Figure
3).
4. Alternatively, use the spectroscopy module as a beam target. Place the spectroscopy module as
far down the table as possible, bolt it down, and center the beam to the input hole.
5. Gently retighten the three locking screws.
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