Dr. Mark F. Spencer is the Director of the Joint Directed Energy Transition Office (JDETO) within the Office of the Under Secretary of Defense for Research and Engineering (OUSD(R&E)). Mark is also an Adjunct Associate Professor of Optical Sciences and Engineering at the Air Force Institute of Technology (AFIT) within the Department of Engineering Physics. He is an active member of the Directed Energy Professional Society (DEPS), a senior member of Optica (the society advancing optics and photonics worldwide), and a fellow of SPIE (the international society for optics and photonics).
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To simulate the effects of multiple-longitudinal modes and rapid fluctuations in center frequency, we use sinusoidal phase modulation and linewidth broadening, respectively. These effects allow us to degrade the temporal coherence of our master-oscillator laser, which we then use to conduct digital holography experiments. In turn, our results show that the coherence efficiency decreases quadratically with fringe visibility and that our measurements agree with our models to within 1.8% for sinusoidal phase modulation and 6.9% for linewidth broadening.
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