The 75160NF comes complete four chopper wheels, an enclosed chopper head with Oriel mounting flange, and a chopper controller with USB 2.0 interface. All it require to run is connect power cable and its ready for chopping action.

The controller drives the chopper head containing a multi-aperture wheel to modulate the light. The chopper head includes Oriel 1.5-inch series flanges, which couple to a wide variety of Oriel instruments. Chopper wheels are easily interchangeable. The enclosed chopper head design prevents detector saturation from unchopped background light and prevents scattering. When chopping lasers or UV beam, you can reduce potential hazards by enclosing the beam path.  For replacement or stand alone ordering of this chopper head, contact your Newport sales representative for part number 75150-1050.

The 75160NF comes with four chopper wheels. Oriel chopper wheels are precision etched, and coated with a broadband absorber to minimize retroreflections. The chopping rate may be set from 4 Hz to 2.00 kHz depend on the chopper wheel. Replacement models are available.

The front panel display of the controller allows monitoring of the chopping frequency, as well as a number of other operating parameters. Easy-to-use cursor keys provide easy adjustment of operating parameters. The chopping rate may be set from 4 Hz to 2.00 kHz, using either the internal frequency synthesizer or an external source as the reference. Chopping mode options are selectable at the fundamental, a harmonic (2 to 15), or even a sub-harmonic (1/2 to 1/15) of the reference.

For stable chopping with minimum jitter and drift, the chopper head uses precision photo-etched wheels mounted on a high-quality DC motor. In addition, the chopper controller has its own internal crystal-controlled frequency synthesizer and phase-locked loop for precisely locking the chopping frequency. A photo-interrupter on the chopper head monitors the chopping frequency, and the chopper controller actively stabilizes the motor speed to ensure stable chopping with a minimum of frequency drift.