Optical Chopper, Phase Locked, Includes 6 Wheels

The 3502 optical chopper head features a high-quality DC motor with a built-in photo-sensor, providing persistent feedback to provide superior drift and jitter parameters during operation.  The wheel cover allows for operator safety while in use, and also provides additional blocking of stray light to the photo-sensor element for improved performance.  Two mounting options are available for end use: mounted directly to an optical table on its base, or at elevated positions on a 1/2"-diameter post.  When mounted by its base, two set screws can be utilized for complete 360° rotation and position locking.  For replacement or stand alone ordering of this chopper head, contact your Newport sales representative for part number 90083484.

Six chopper wheels are included with the 3502 optical chopper system allowing for chopping frequencies from 4 Hz to 10.65 kHz (not included in the 3502-BASE model). Shown in the top row are the 60/2-slot, 7/5-slot, and 2-slot wheels, and the bottom row shows the 100-slot, 42/30-slot, and 60-slot wheels. All chopper wheels are 4.50 inch (114.3 mm) diameter.  These high quality chopper wheels are made of a beryllium copper alloy, which offer superior performance compared to lower cost steel alternatives.  This material choice allows for better thermal conductivity, higher strength, tighter machine tolerances, and are non-magnetic, non-sparking, and corrosion resistant.  If a wheel becomes lost or bent, replacement models are available.