Optomechanics

MC1000A, Optical Chopper System, Thorlabs

Chopping With One Blade: 25Hz to 1kHz (6kHz With MC1F60 Blade)
Low Frequency Drift: <100ppm (parts per million)

Crystal Stabilized Phase-Locked Loop for Low Drift
Low Phase Jitter – 0.2° RMS at 1kHz, 10 Slot Blade
2-Frequency Blades Available for Pump-Probe and Other
Nonlinear Experiments
Phase & Frequency Lock on External Reference
Harmonic and Sub-Harmonic Chopping With Sum &
Difference Reference Outputs
Microprocessor Controlled
Save and Recall User Setups in Non-Volatile RAM
RS-232 Interface Standard Feature