Fast Servo Controller (FSC)
The MOGLabs FSC fast servo controller provides high bandwidth low latency PID/PI2D feedback control for linewidth narrowing and frequency locking with a highfinesse optical cavity.
Front-panel controls of all loop parameters make it very easy to use: no fiddling with hidden rotary switches or trimpots.
Parallel FAST and SLOW control loops are designed for feedback to laser current and piezo. An internal ramp generator allows convenient scanning to find a peak, with simple scan/lock switch to lock.
Two photodiode power supplies are included, with standard Thorlabs-style connectors. A companion high-speed ultralow-noise photodetector suitable for PDH cavity locking is also available.
Features
- Low latency (<40ns)
- High bandwidth
- Intuitive controls
- Auto-lock to center of oscilloscope trace
- Two oscilloscope trace selector switches
- Two parallel feedback loops
- PID/PI²D loop shaping
- Ramp generator
- High-bandwidth external modulation
- Low-noise photodiode power supplies (±12V)
Applications
- Laser frequency stabilization
- Linewidth narrowing
- - Optical cavity locking
- - Beatnote offset locking
Specifications
General
| Bandwidth (fast output) | >35 MHz (–3 dB) |
|---|---|
| Propagation Delay | < 40ns |
| 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 | SMA, 1MΩ, ± 2.5V |
|---|---|
| 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 [measured 3.2nV/√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: I or I² , 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 low-pass filter | Off, 25kHz – 200kHz |
| Fast gain limit | Off, 0 – 60dB |
| Slow output | SMA, 0 - 5V, 50Ω impedance |
| Fast output | SMA, ± 2.5V, 50Ω impedance |
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 | 250x79x292mm (W x H x D), 2kg |
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