Vescent D2-105, Manual

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2021/12/18 07:41 9/19 Laser Controller
Product Manuals - https://www.vescent.com/manuals/
Fig. 3: Temp control board with T2 Temp Servo Input gain switch circled
When the gain is set to “LOW”, the slope for changing the set point is ~95 mK/V.
When the gain is set to “HIGH”, turn the set point to the lowest desired temperature. Apply a voltage
between -10V and 10V to TEMP SERVO INPUT to adjust the set point temperature. With this
configuration, you can sweep the set point all the way from the low-temperature limit (-1°C) to the
high-temperature limit (58°C). NOTE that the Vescent Photonics Lasers should not be operated above
50°C or below the dew point for your laboratory conditions. The slope for changing the set point is ~9
K/V.
The “Low” mode is designed for slow temperature feedback for long-term (days) stability of the
locked laser. Normally the Temp Servo Input is used to drive the dc value from the Current Servo
Ouput on the Laser Servo to zero over long time scales. In other words, temperature tuning is used to
remove large, slow variations in the laser frequency. To accomplish this, connect the Temp Servo
Output from the Laser Servo module to the Temp Servo Input of the Laser Controller (with TEMP
SERVO INPUT Gain is set to “Low”). This connection is only important if the user is trying to maintain a
laser lock continuously over many days or even weeks. Without feedback to Temp Servo In the Laser
Servo can eventually run out of range.
Laser Temp Output (8-pin connector)
An 8-pin Hirose connector (see table 2 for identity of connectors) carries the signals for the
temperature control of the Laser module. The wiring diagrams are shown in table 1 below, where 1 (2)
refer to stage 1 (2) temperature control, which stabilizes the Laser Housing (Laser Diode). Rth and
Rth_Rtn are the two ends of a 10 kΩ
Analog Technologies ATH10KR8 Thermistor .
Pin Signal
1 TEC1+
2 TEC1-