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Digital Feedback Controlyzer:
DigiLock 110
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Module for laser control, locking and analysis
- General stabilization and locking module
- FPGA based laser locking: fast & flexible
- Fully digital and computer controlled
- Signal delay time: 200 ns, allowing for MHz bandwidths
- Even faster analog bypass
- Two PID channels for separate Piezo and current feedback
- One lock-in module for top-of-fringe locking
- "Click & Lock" technology
- Lock optimization with spectrum and network analysis as well as regulator simulation
Applications
- Easy locking for everyone
- Tight laser frequency stabilization
- Laser linewidth reduction
- Laser and spectroscopy transfer function analysis
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The DigiLock 110 is a digital solution for laser locking. It consists of FPGA based hardware with numerous analogue and digital inputs and outputs. The hardware module can be fitted into TOPTICA's SYS DC 110 rack system, and is controlled by special software via USB.
This combination allows numerous possibilities. The system can be used as a multi-channel oscilloscope to display a laser scan across an atomic resonance for example. The scan can be controlled by software to zoom into the absorption features, reducing the scan width. The "Click & Lock" technology then allows for the laser to easily be locked to any slope or peak in this spectrum. If more experienced users want to optimize the lock, they can take advantage of the network and spectrum analysis functions: measure transfer functions of all actuators in the laser, analyze the spectrum of the error signal, etc., etc. Together with all the advantages, that a digital lock offers over an analog solution, the result is not only easy locking, but also the optimum locking performance. |
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Specifications and implemented functions:
- 100 MHz FPGA (field programmable gate array)
- Digital inputs and outputs with up to 100 MHz and up to 16 bit (cascaded: 21 bit)
- 1 direct analog output that can be user manipulated and combined with the FPGA main output
- USB connection for computer control
- 2 DDS scan controllers with up to 1 MHz scan frequency
- Lock-in amplifier with up to 780 kHz dither frequency and integrated high quality filter
- Pound-Drever-Hall unit with up to 20 MHz modulation frequency
- 2 PID controllers with locking bandwidth in the MHz range
- Digital signal processing/delay time 200 ns
- Multi-channel digital oscilloscope functionality
- Network analyzer functionality
- Controller design (regulator function calculation and display)
- AutoLock with "Click and Lock" feature
- Automatic relock
- Communication with backplane lines of TOPTICA’s laser supply rack DC 110
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| DigiLock frequency scan across Doppler free Rb lines (red). The black trace shows the laser scanning to the lock point, that was chosen by "Click & Lock", and going into lock (black "cloud"). |
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| Screen shot of the computer display showing the DigiLock in scan mode with two PID controllers, and lock-in amplifier. The oscilloscope display shows a Doppler-free saturation spectroscopy signal of Rb and the lock-in error signal obtained using lock-in detection. |
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| Application Notes |
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| Contact |
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TOPTICA Photonics AG
Lochhamer Schlag 19
82166 Graefelfing (Munich)
Germany
T +49 89 85837-0
F +49 89 85837-200
TOPTICA Photonics Inc.
1286 Blossom Drive
Victor, NY 14564
USA
T 585.657.6663
F 877.277.9897
 sales@toptica.com
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