The SR542 Precision Optical Chopper provides ultra-stable and flexible optical chopping. The chop frequency is tunable over a wide range, and frequency and phase can be controlled from a variety of input sources including synchronization to an external reference. The front panel provides an intuitive view of the entire configuration
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An optical chopper provides a direct way to modulate laser light. The SR542 Precision Optical Chopper offers enhanced features and configurability as well as optimized chopping performance. Whether your application requires
The chopper can be synchronized to a variety of input sources including an external frequency reference
The user can select the inner slots, outer slots, or the shaft
The chopper head employs a slotless, brushless DC motor (BLDC), which minimizes mechanical vibrations and helps keep your optical setup quiet. Furthermore, without the
Precision photo-etched blackened stainless steel chopper blades come in a variety of single and dual frequency designs, plus a variable duty factor design. Tight tolerances for the blade etching ensures low phase jitter of the optically chopped signals.
The chopper head can be mounted to a standard one inch optical breadboard using the slotted base plate
Chopper Head with Shroud
A removable shroud prevents accidental collisions with the operational chopper head.
While BLDC motors are typically controlled with high frequency PWM signals, the SR542 uses an analog current amplifier with
Six always-available rear-panel reference outputs provide flexibility for synchronization of multiple instruments, including the ability to cascade choppers or trigger other instruments
Intuitive Front Panel
The front panel of the SR542 controller displays a block diagram of the chopper control loop, which makes it easy and intuitive to see and adjust the instrument configuration. Numeric settings can be entered via either the number keypad or rotary knob.
The SR542 can also be operated as a simple optical shutter. With an Internal frequency set to 0 Hz, the static rotational orientation of the chopper blade can be controlled by the phase setting. By proper choice of phase, the user can alternately pass or block the optical beam.