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///focus control

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This system can be mounted on the lamp port of any commercial microscope and keeps the sample in focus in long lasting experiments or when the sample is moved and must rapidly be refocused.

The system is based in the focus error signal provided by a 780nm laser reflected on the surface of the slide or cover slip. Once the focus is set a feedback PID loop keeps the system in focus even under fast movements of the stage in search for different sample regions. If, by accident, the focus is lost the system can automatically recover it if required.

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