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www.thinkSRS.com Optical Chopper Experiments Application Note #11 Single Beam Experiment Dual Beam Experiment In this application, a single optical beam is chopped by the In this arrangement, the output from a single source is split outer row of slots, and the reference output from the right and chopped at two different frequencies by the two rows of BNC is used to lock the lock-in amplifier to the chop chopper slots. One beam passes through the experiment while frequency. The inner row of slots could also be used, in which the other is used as a reference beam. The beams are case the left BNC would be the reference output. In either recombined and sent to the same detector. Two lock-ins are case, the REFERENCE MODE switch is in the "up" position. 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. Aperture 0.84" (6-slot) Aperture 0.62" (5-slot) 4.65" (118 mm) Aperture 0.170" (30-slot) 5/6 slot blade (4.04" diameter) Aperture 0.124" (25-slot) 3.08" (78.2 mm) 25/30 slot blade (4.04" diameter) Stanford Research Systems phone: (408)744-9040 www.thinkSRS.com