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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

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