Fast Servo Controller

The FSC is an ultra-fast PID servo controller for high-bandwidth laser locking,

with separate control loops for fast (typically diode current) and slow (usually piezo)

feedback for complete control of laser frequency.

Critical feedback parameters are easily adjusted using the front-panel control knobs for cavity locking,

linewidth narrowing or beatnote offset locking applications.

Compatible with all laser heads that include direct injection modulation

(such as the CEL or LDL) and

drivers that include external piezo control (such as the DLC).

A matched low-noise 30MHz photodetector, the PDA030,

can be powered directly from the FSC.

• High-bandwidth PID or PI²D control
• All-analogue signal processing with propagation delay 40ns
• Parallel FAST and SLOW control loops
• Feedback to both current and piezo
• Flexible control of loop parameters
• High-bandwidth external modulation
• Internal ramp generator
• Two low-noise photodetector power supplies
• TTL control