Laser Diode Current Controller LQprO

Within our work on laser development we have developed a laser diode current controller. There are two versions:

  • an ultra-low noise current controller (up to 140 mA)
  • a low-noise current controller (up to 400 mA)

Feature List

  • Low noise
  • Stable operation
  • Modulation capabilities
  • Slow modulation over full scale
  • Simultaneous slow/fast modulation
  • Suitable for Pound-Drever-Hall stabilization
  • Four layer board SMD technology
  • Other currents/voltages upon request
  • 19'' Rack assembly incl. power supply available

Images

LQprO-140
Noise characteristics of LQprO-140 compared to other systems

Specifications

Parameters Ultra-Low Noise Low Noise Units Remarks
Output Current Range 0 – 140 0 – 400 mA Other Currents on request
Output Current Resolution 22.4 64 µA  
Output Current Accuracy 0.1 0.1 % FS  
Laser Output Compliance Voltage 1.7 – 2.9 1.7 – 2.9 V Other Voltages on request
Temperature Coefficient < 25 < 85 ppm FS/°C  
Output Current Short-Term Stability < 0.9 < 0.9 ppm FS 10 minutes
Output Current Long-Term Stability < 3.3 < 3.3 ppm FS 1 hour
Output Current RMS Noise < 21 < 60 nA 10 kHz – 100 kHz
  < 92 < 265 nA 10 kHz – 1 MHz
Output Current Noise density < 300 < 850 pA/sqrt(Hz) 10 kHz – 1 MHz
Current Limit Range 0 – FS 0 – FS mA  
Current Limit Resolution 70 200 µA  
Current Limit Accuracy 0.1 0.1 % FS  
Display Resolution 0.1 1 mA  
External Analog Modulation Input Impedance 1k 1k Ohm Slow Mod
  50 50 Ohm Fast Mod
External Analog Modulation Input Range -10 – 10 -10 – 10 V Slow Mod
  -10 – 10 -10 – 10 V Fast Mod
External Analog Modulation Transfer Function 8 – FS 12 – FS mA/V Slow Mod (Adjustable)
  1 1 mA/V Fast Mod
External Analog Modulation Bandwidth (3 dB) 200 200 kHz Slow Mod depending on Laser Diode
  up to 150 up to 150 MHz Fast Mod depending on Laser Diode
Display Type LCD Backlit LCD Backlit    

Data Sheet

The data sheet is available Opens external link in new windowhere.

More Information etc.

Please contact Thorsten Führer or Benjamin Rein for more details.

thorsten.fuehrer@physik.tu-...;
benjamin.rein@physik.tu-...;

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Kontakt

Prof. Dr. Thomas Walther

Laser und Quantenoptik
Institut für Angewandte Physik
Fachbereich 05 - Physik
Technische Universität Darmstadt
Schlossgartenstr. 7
D-64289 Darmstadt

+49 6151 16-20831 (Sekretariat)

+49 6151 16-20834

Thomas.Walther@physik.tu-...

News

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