Precision Electro-Optic and Laser Technologies

D2-105 Laser Controller

Contact Vescent

                          Laser Controller


  • New! Modified PID parameters for easier temperature control over low thermal mass lasers
  • Lowest noise current source commercially available
  • Two-stage PID temperature control
  • High-speed servo and RF inputs
  • Current limit and safe turn-on
  • High modulation bandwidth





The D2-105 is a precision diode laser current source, based on the Libbrecht-Hall* circuit. With a current noise density <100 pA/√Hz, the D2-105 has lower noise than any other commercially available laser controller. This ultra-low current noise is ideally suited for precision spectroscopy and metrology applications. Furthermore, two-stages of temperature control provide sub-mK stability, ensuring long-term frequency stability.

A front panel current servo BNC input enables high-speed (>10 MHz) servo control of the laser frequency. Additionally, extremely high speed modulation is enabled by a front panel RF port, which is connected directly to the laser current output SMA. This enables the user to directly write sidebands onto the laser via injection current, which can save the use of expensive AOMs and EOMs. To keep 60 Hz harmonics off the output current, the D2-105 is powered with either the linear D2-005 power supply or user-provided power via a breakout board (D2-001).

The D2-105 features two independent PID loop filters for controlling the temperature of your diode laser. The range of parameters for one of these loops is expanded to make it especially easy to temperature control low thermal mass lasers such as the Photodigm TOSA.  It is possible to have the other loop modified to control fast loops also.  Ask for the -FL option.

The D2-105 is designed to integrate into our Rackless Rack.  As such, it may be powered with our D2-005, or from an adjacent D2 electronics module.  If used as a stand-alone product, it may be powered with either a D2-005 or from a user-supplied power supply via a breakout board.

Current Source
Current Range0-2000-500mA
Current Noise Density<100<200pA/√ Hz
RMS Noise (10Hz – 100 kHz)<50<100nA
RMS Noise (10Hz – 1 MHz)<100<150nA
RMS Noise (10Hz – 10MHz)< 300< 500nA
Monitor Resolution (Display)0.11mA
Absolute Accuracy22%
Temperature Coefficient<1<5μA/oC
Current Servo Input
Input Impedance10001000Ω
Modulation Coefficient11mA/V
Input Modulation Range±10±10V
RF Input Bandwidth0.5 to >1,5000.5 to >1,500MHz
Temperature Servo Input
Input Impedance100100
Temp. Modulation Coefficient
Gain = Low-20-20mK/V
Gain = High-600-600mK/V
Temperature Control
Temperature Setpoint Range10 to 500 to 50oC
Long-term Stability (T2)33mK/day
Max. TEC Current (Voltage)1 (4)1 (4)A (V)

1We strongly recommend not lowering the diode temperature below the dew point for your conditions.