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-switchable 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.

Request a Quotation Application Note Phase and Frequency Locking of Diode Lasers

Specification

PDH module
Number of channels	2
Input/Output connectors	3x SMB per channel
Modulation output 1/2
Waveform	Sine
Level	-49.2 dBm .. 13.8 dBm (2.2 mV .. 3.1 V peak-to-peak voltage)
Frequency	5 MHz or 25 MHz, switchable
Output Impedance	50 Ω

Additional Information

Pound-Drever-Hall detection scheme

Pound-Drever-Hall error signal

Locking using frequency modulation
Applications
- Metrology
- Cavity ring down spectroscopy
- Rydberg Excitation (Rydberg Flyer for complete laser solutions)
- Optical Clocks
Downloads
- Product Brochure Scientific Lasers (please see website for latest specs!)
Literature
- Application Note: 12 orders of coherence control
- Application Note: Trapping and Quantum Computing
Related Products
The PDH module generates error signals that serves as input for PID controller such as FALC pro, FALC 110, DigiLock 110 or DLC pro Lock.
- FALC pro: High performance PI³D² regulator for linewidth narrowing, external module of DLC pro
- DigiLock 110: Versatile digital module for computerized locking tasks
- FALC 110: High bandwidth PID for linewidth narrowing
- ECDL/DFB diode lasers, high power diode lasers and frequency converted diode lasers can conveniently be locked with PDHand a PID module
- FPI 100: Fabry-Perot interferometer and detector unit
- Wavelength meters

Input range	-10 dBm, 0 dBm, + 10 dBm (max. input level)
Mod./Demod. Relative Phase Step	1.3° (5 MHz), 6.5° (25 MHz)
Error Signal Bandwidth (digital)	1.5 MHz (- 3 dB)
Input Impedance	50 Ω
Error Output 1/2
Range	±1.5 V
Output Impedance	50 Ω
Bandwidth	50 MHz (-3 dB)
Group delay	20 ns
LO Output 1/2
Level	- 20.7 dBm .. 10.8 dBm (58 mV .. 2.2 V peak-to-peak voltage)
Output	Impedance 50 Ω