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Using an EOT ET-Series Photodetector to Detect Beat Notes

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Using an EOT ET-Series Photodetector to Detect Beat Notes

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In many laser-based experiments and devices, multiple lasers must operate at different, but strictly defined wavelengths. In this situation, it is often expeditious to reference one of these lasers, the socalled leader, to a primary wavelength standard such as an atomic transition and reference all the other lasers to this leader taking into account the wavelength o↵sets required by the goal of the device. An e↵ective way to achieve this is an o↵set phase lock between the leader and follower laser where the di↵erence between the observed o↵set and the target o↵set is used as an error signal to dynamically correct the o↵set via a servo loop.

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