Fringe modulation for an MROI beam combiner

T. M. McCracken; C. A. Jurgenson; D. H. Baird; J. K. Seamons; K. M. McCord; D. F. Buscher; C. A. Haniff; J. S. Young

doi:10.1117/12.857295

21 July 2010 Fringe modulation for an MROI beam combiner

T. M. McCracken, C. A. Jurgenson, D. H. Baird, J. K. Seamons, K. M. McCord, D. F. Buscher, C. A. Haniff, J. S. Young

Proceedings Volume 7734, Optical and Infrared Interferometry II; 77343V (2010) https://doi.org/10.1117/12.857295
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

We report on the testing of the modulators within the MROI fringe tracking beam combiner. Modulation in the beam combiner will be performed via modulators introducing an optical path difference in increments of λ/4 into the beams. Knowledge of the path difference introduced needs to be accurate to within 1!. To achieve this accuracy, the modulators are characterized and the desired step waveform optimized through a Fourier analysis technique. Control is implemented in an FPGA embedded system and performance will be monitored by means of a slow loop Fourier algorithm. Details of the progress on characterization, optimization and future implementation are presented here.

Citation Download Citation

T. M. McCracken, C. A. Jurgenson, D. H. Baird, J. K. Seamons, K. M. McCord, D. F. Buscher, C. A. Haniff, and J. S. Young "Fringe modulation for an MROI beam combiner", Proc. SPIE 7734, Optical and Infrared Interferometry II, 77343V (21 July 2010); https://doi.org/10.1117/12.857295

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