The Stanford Research System SR540 Low jitter optical chopper handles
all your optical chopping requirements - from simple measurements to dual-beam and intermodulation experiments.
The SR540 has a 4-digit frequency display, front-panel frequency control, analog voltage frequency control and
two reference outputs with selectable operating modes. Two anodized aluminum blades are provided: a 5/6 slot
blade for frequencies up to 400 Hz, and a 25/30 slot blade for frequencies up to 3.7 kHz. Reference outputs
are provided for frequencies corresponding to each row of slots, as well as the sum and difference frequencies.
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In this application, a single optical beam is chopped by the outer
row of slots, and the reference output from the right BNC is used to lock the lock-in amplifier to the chop
frequency. The inner row of slots could also be used, in which case the left BNC would be the reference output.
In either case, the REFERENCE MODE switch is in the up position.
In this arrangement, the output from a single source is split and
chopped at two different frequencies by the two rows of chopper slots. One beam passes through the experiment
while the other is used as a reference beam. The beams are recombined and sent to the same detector. Two lock-ins
are used to detect the signals at inner, corresponding to the experimental signal, and outer,
corresponding to the reference beam. If the detected signal in the experimental arm is ratioed to the detected
signal in the control arm, then effects due to changing source intensity and detector efficiency are removed.
SRS SR540 Features
- Low phase jitter
- Single and dual beam experiments
- 4 Hz to 3.7 kHz chopping frequencies
- Sum & difference reference outputs
- Bolt clamp or rod mounting
Ask for SRS SR540 detailed specification.