The Model 3502 replaces our very popular 3501 optical chopper and is primarily used in non-linear optics and ultrafast experiments, fluorescence lifetime experiments, or applications requiring light modulation when optical signals are small.  The redesigned electronics allows us to offer the 3502 chopper at a lower price while preserving the performance and functionality of the 3501.
● Stable and reliable phase locking
● Chopping is phase-locked to an internal frequency synthesizer
● Frequencies from 4 Hz to 10.65 kHz
● Lock to external references for harmonic or sub-harmonic chopping

Specifications

Model	Description	Lowest Frequency (Fouter)	Highest Frequency (Fouter)	Jitter (µs p-p, typical)
3511				@ Minimum Frequency	@ Maximum Frequency
3512	Chopper Wheel, 2 Slot, for 3502 Chopper	4 Hz	213 Hz	2000	50
3513	Chopper Wheel, 7 and 5 Slot, for 3502 Chopper	14 Hz	746 Hz	1000	15
3514	Chopper Wheel, 42 and 30 Slot, for 3502 Chopper	84 Hz	4.48 kHz	150	5
	Chopper Wheel, 60 Slot, for 3502 Chopper	120 Hz	6.4 kHz	150	3
	Chopper Wheel, 100 slot, for 3502 Chopper	200 Hz	10.65 kHz	200	5