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Towards a FPGA-controlled deep phase modulation interferometer



Marcelo Teran, Victor Martin, Lluis Gesa, Ignacio Mateos, Ferran Gibert, Nico Karnesis, Juan Ramos Castro, Thomas Schwarze, Oliver Gerberding, Gerhard Heinzel, Felipe Guzman, Miquel Nofrarias


Deep phase modulation interferometry was proposed as a method to enhance homodyne interferometers to work over many fringes. In this scheme, a sinusoidal phase modulation is applied in one arm while the demodulation takes place as a post-processing step. In this contribution we report on the development to implement this scheme in a fiber coupled interferometer controlled by means of a FPGA, which includes a LEON3 soft-core processor. The latter acts as a CPU and executes a custom made application to communicate with a host PC. In contrast to usual FPGA-based designs, this implementation allows a real-time fine tuning of the parameters involved in the setup, from the control to the post-processing parameters.
Journal of Physics: Conference Series


laser interferometery, optical metrology, instrumentation, phasemeter


Teran, M. , Martin, V. , Gesa, L. , Mateos, I. , Gibert, F. , Karnesis, N. , Ramos Castro, J. , Schwarze, T. , Gerberding, O. , Heinzel, G. , Guzman, F. and Nofrarias, M. (2015), Towards a FPGA-controlled deep phase modulation interferometer, Journal of Physics: Conference Series (Accessed July 24, 2024)


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Created May 10, 2015, Updated October 12, 2021