Thomas J. Papetti

Principal Research Scientist VI,


301 Sparkman Drive
Optics Building
Room 446
Huntsville, AL 35899
Campus Map


Over 44 years of work in solid-state laser design, nonlinear optics, coherent optical sensing, optical
speckle phenomenology, indoor optical test range design and operation, surface scattering
characterization, laser beam diagnostics, large optical system alignment, metrological interferometry,
beam control for directed energy, and atmospheric turbulence measurements.


  • B.S., Physics, University of Central Florida, 1979


  • U.S. Patent 5,199,042, March 30, 1993, Unstable Laser Apparatus, T. Papetti et al.


  • Active Laser Seeker (International Laser Systems, 1979-1980)
  • Phase Conjugate Laser Amplifier, Medium Energy Laser Program for U.S. Army Night Vision Labs (Litton Laser Systems, 1985-1989):
  • Active pre-lase control of a self-seeded Q-switched Nd:YAG laser oscillator
  • 10 mm aperture Faraday rotator design
  • Graded reflectivity unstable resonator with compensation for thermally-induced birefringence
  • Pulse-burst coherent Nd:YAG ladar transceiver
  • Software-Defined Coherent Lidar, specifically implementing a pseudo-randomly phase modulated waveform for range-Doppler imaging without range or Doppler ambiguities
  • Directed Energy projects

Recent Publications

  • “MRDF and BRDF Measurements of Low-Scatter Materials”, Papetti, T. J. et al, SPIE Symposium on Defense
    and Security, Paper No. 6550-16, (2007).

  • “Coherent Backscatter: Measurement of the Retroreflective BRDF Peak Exhibited by Several Surfaces
    Relevant to Ladar Applications”, Papetti, T.J. et al, SPIE Optics and Photonics Symposium, Paper No.
    6682-13, (2007).

  • “Coherent Mode-locked 1.06 micron Ladar Transmitter”, Papetti, T. J. et al, SPIE Proceedings Vol. 1633, pp 6-
    14, (1992).