Fast Servo Controller
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 centre 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 stabilisation
Linewidth narrowing
Optical cavity locking
Beatnote offset locking
Specifications
| General | |
| Bandwidth (fast output) Propagation delay External modulation Sweep mode Internal sweep rate Monitor outputs | >35 MHz (–3 dB) < 40ns 0 – 35MHz (–3 dB) Internal or external Adjustable, 1 – 50Hz 2 selectable monitors, ± 5V |
| Inputs | |
| A in, B in External sweep External gain control External fast modulation Input noise Error offset TTL lock input | SMA, 1MΩ, ± 2.5V SMA, 1MΩ, 0 to 2.5V, 10kHz bandwidth SMA, 1MΩ, ± 1.0V SMA, 1MΩ, ± 1.0V < 5.5nV/√Hz ± 450mV 3.5mm stereo jack, active low |
| Servo controls | |
| Servo type Controller action Slow gain Slow integrator Fast gain Fast integrator Fast differentiator Fast differentiator gain limit Adjustable low-pass filter Fast gain limit Slow output Fast output | Independently configurable fast and slow servos, can be nested Slow: I or I2 , Fast: PID -20dB to +20dB Off, 25Hz – 1kHz -14dB to +46dB Off, 10kHz – 2MHz Off, 100kHz – 10MHz 0 – 24dB Off, 25kHz – 200kHz Off, 0 – 60dB SMA, 0 - 5V, 50Ω impedance SMA, ± 2.5V, 50Ω impedance |
| IEC input Photodiode supply output Power consumption Dimensions | 100 or 110/120 or 220/240V, 50/60 Hz, 3A ±12V, 150mA, M8 connector < 10W 250x79x292mm (W x H x D), 2kg |
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