Interferometer controller IC 5 controls any interferometer-type deflection measurement
For ultra-sensitive detection of cantilever deflections, fiber interferometry is a powerful technique. Nanonis has introduced an active feedback loop to control the gap between the fiber-end and the back surface of the cantilever, ensuring detection of the cantilever motion at the optimal working point of the interferometer signal.
The module performs an automatic calibration of cantilever deflection and piezo movement according to the wavelength of the laser, and automatically adjusts the operating point in order to optimize the sensitivity.
The deflection can be measured either through the interferometer signal (open loop) or by the piezo movement (closed loop).
The module is compatible with a Fabry-Pérot interferometer type.