Thorlabs MC1000 Optical Chopper System w/Manual Tested Working

This is a Thorlabs MC1000 Optical Chopper System. This Chopper was tested was found to be in good working condition (see video). It comes with a 30 slot blade that has a chopping frequency range: 75-3000 Hz. It also comes with an operating manual and we offer 30 days warranty.

Items included:

• MC1000 Optical Chopper head
• MC1000 Optical Chopper controller
• 6 feet cable that connects the head to controller
• USB flash drive containing PDF copy of the operating manual

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Manufacture's Description

The MC1000 Optical Chopper is a precision instrument utilizing advanced features to meet the most demanding applications. The MC1000 uses a phased-lock loop (PLL) motor speed control design to precisely lock the chopping speed and phase to a reference signal. An internal, crystal-stabilized frequency synthesizer provides an accurate and stable reference frequency for ultra-low long-term frequency drift. 

Unlike conventional, open-loop speed control designs, the PLL speed control circuit also allows the MC1000 chopper to be synchronized to external reference signals, including other MC1000 choppers and reference sources such as DSP lock-in amplifiers. The phase of the MC1000 chopper wheel is continuously adjustable from -π to +π (-180° to +180°.) 

For more advanced measurements, the MC1000 can lock to a harmonic, sub-harmonic, or fractional-harmonic of an external reference frequency. A second PLL circuit is used to multiply the external reference up to the 15th harmonic. This multiplier is followed by a digital divider to divide the reference down to the 15th sub-harmonic. By combining both the frequency multiplication and division together, a fractional harmonic can be obtained. 

The MC1000 also supports 2-frequency chopping from a single chopper blade. A special blade is available with 7 outer slots and 5 inner slots. This slot combination allows a single beam to be split and individually modulated for ratio metric experiments. Other applications include pump-probe experiments where the pump beam is modulated at the outer frequency while modulating a probe beam at the inner frequency. The MC1000 provides the sum and difference frequencies of the 2-frequency blade for accurate lock-in detection of the frequency-mixed response. 

A high-quality, Swiss-made, rare earth magnet DC motor drives the precision, photo-etched chopper optical wheel. The compact optical head has a wide base for extra stability. The base is slotted for two ¼-20 mounting screws on 2” centers. The interface cable uses standard RJ-45 modular connectors for easy setup. 

The MC1000 controller includes a large, 4-digit, easy to read LED display for monitoring the chopper frequency. All of the operating modes are accessible from streamlined, front panel push-button controls. Multiple user setups can be easily saved and recalled from non-volatile memory. An RS-232 serial interface is included as a standard feature for remote interfacing the MC1000 to other equipment. Thorlabs offers a number of different blades to extend the range of the chopping frequency.

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