The MOGLabs Fast Servo Controller (FSC) is an ultra-fast PID servo controller for high-bandwidth laser locking. The FSC has separate control loops for fast (current) and slow (piezo) feedback for complete laser frequency control.
The control loop can be tuned for optimal cavity locking, linewidth narrowing or beatnote offset locking applications.
Compatible with all laser heads that include direct injection modulation (such as the MOGLabs CEL or LDL) and drivers that include external piezo control (such as the DLC).
A matched low-noise 30MHz photodetector, the MOGLabs PDA030, can be powered directly from the FSC.
Specifications
| General | |
|---|---|
| Bandwidth (fast output) | >35 MHz (–3 dB) |
| Propagation delay | < 28ns |
| External modulation | 0 – 35MHz (–3 dB) |
| Sweep mode | Internal or external |
| Internal sweep rate | Adjustable, 1 – 50Hz |
| Monitor outputs | 2 selectable monitors, ± 5V |
| Inputs | |
| A in, B in | A in, B in |
| External sweep | SMA, 1MΩ, 0 to 2.5V, 10kHz bandwidth |
| External gain control | SMA, 1MΩ, ± 1.0V |
| External fast modulation | SMA, 1MΩ, ± 1.0V |
| Input noise | < 5.5nV/√Hz |
| Error offset | ± 450mV |
| TTL lock input | 3.5mm stereo jack, active low |
| Servo controls | |
| Servo type | Independently configurable fast and slow servos, can be nested |
| Controller action | Slow: PI or PI2, Fast: PID |
| Slow gain | -20dB to +20dB |
| Slow integrator | Off, 25Hz – 1kHz |
| Fast gain | -14dB to +46dB |
| Fast integrator | Off, 10kHz – 2MHz |
| Fast differentiator | Off, 100kHz – 10MHz |
| Fast differentiator gain limit | 0 – 24dB |
| Adjustable fast filter | Off, 25kHz – 200kHz |
| Fast gain limit | Off, 0 – 60dB |
| Servo output | SMA, ± 5V, 50Ω impedance, drives 50Ω loads |
| Power and dimensions | |
| IEC input | 100 or 110/120 or 220/240V, 50/60 Hz, 3A |
| Photodiode supply output | ±12V, 150mA, M8 connector |
| Power consumption | < 10W |
| Dimensions | 250 x79 x 292mm (W x H x D), 2kg |
Laser frequency stabilisation
Linewidth narrowing
Optical cavity locking
Beatnote offset locking
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Photonic Solutions Ltd
Unit 2.2 Quantum Court
Heriot-Watt University Research Park
Edinburgh
EH14 4AP
