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PDH/DLC pro

Pound Drever Hall Module

  • Module generates a dispersive error signal
  • Serves for high bandwidth top-of-fringe laser locking
  • Error signal generation by frequency modulation
  • Modulation frequency-selectable 5 MHz or 25 MHz
  • Features two channels

The Pound-Drever-Hall detector PDH is a built-in module of the DLC pro and serves to lock a diode laser to a maximum absorption or transmission of a reference medium (e.g. an optical resonator). The PDH features an internal HF modulation source for modulating the diode laser frequency. The signal from the reference is detected and demodulated phase sensitively to produce a high bandwidth dispersive error signal that can be used to lock the laser using a PID controller.