Zeb Barber

Phone: 406.994.5925



Ph.D. Physics, University of Colorado\NIST
B.S. Physics, Montana State University
Research Interests
laser stabilization, metrology, precision spectroscopy, ladar, lidar, atomic physics, photonic signal processing












William Randal Babbitt

Phone: 406.994.6156

Research Interests
Professor Babbitt’s main research interest is developing applications of spatial-spectral holography. Spatial-spectral holography combines the spatial storage and processing attributes of persistent spectral holeburning. Spatial-spectral holographic (SSH) phenomenon encompasses optical coherent transients, photon echoes, and time-domain spectral hologram analogous to the manner in which angled beams are recorded in spatial holograms. A SSH material is basically a fully programmable spectral filter with ultra-high spectral resolution and broad processing bandwidth whose impulse response is dictated be the programming pulses and their temporal shapes and their relative delay and directional. An appropriately programmed material processes incoming broadband optical beams by multiplying their Fourier decomposition be the material’s programmed frequency response, resulting in a processed output temporal waveform. SSH materials thus offer an unmatched ability to store, process, and route complex broadband optical signals with precise phase and delay control.


Jason Dahl

Research Scientist
Phone: 406.994.6845


B.S. Physics; Montana State University 2005
M.S. Science & Engineering Management; Montana State University 2015

Cal Harrington

Research Scientist
Phone: 406.994.7191

B.S. Physics; Randolph Macon College 1987
M.S. Physics; Montana State University 1994
Research Interests
Cal began working for Spectrum Lab in February of 2004. Previously he worked in a variety of optics research positions including work at the Naval Research Lab, ’87 – ’91, studying the transient effects of radiation induced damage in optical fibers, and at ILX Lightwave Corporation, ’00 – ’02, building and managing a lab for calibrating the optical responsivity of photodiodes.



Dr. Krishna Rupavatharam

Senior Research Scientist
Phone: 406.994.7675

M.Sc Physics, SSS Institute of Higher Learning, Prashanti Nilayam, India
Ph.D. Physics, Indian Institute of Science, Bangalore India
Research Interests
Krishna's current research is geared towards developing applications of S2 technology. He has worked on developing a microwave spectrum analyzer for capturing and analyzing large bandwidth RF signals. Krishna's past research involved modeling and high level simulation of the S2CHIP as well as the design and implementation. He is also an adjunct faculty at Lund Institute of Technology and engages in research on quantum information processing involving rare-earth doped crystals. Krishna joined the Spectrum Lab in the Fall of 1999 as a research scientist.

Krishna's doctoral thesis dealt with Optical Phase Conjugation and Phase Conjugate Interferometry. The research involved the development of phase conjugate holographic devices using both polymers and photorefractive crystals, transient phase conjugation in polymers, high sensitivity phase conjugate and holographic real-time interferometers.

In 1997, he joined Prof. Kroll's group in Lund Institute of Technology, Lund, Sweden, where he worked on time domain optical data storage and quantum optics of phase memory systems. The research included diverse topics such as single photon self-interference realization, time domain analog of Fresnel to Fraunhofer diffraction transition, bit-selective erasure of photon echo based memories and fiber-based photon echo amplifiers.


Dr. Charles Thiel

Senior Research Scientist
Phone: 406.994.5239

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Tia Sharpe

Research Engineer
Phone: 406.994.7550


B.S Electrical Engineering, 1986, Montana State University
M.S Electrical Engineering, 1992, Montana State University
Research Interests


Tia joined the Spectrum Lab in January of 2010 as a research engineer. Her current research is geared towards developing applications of spectral-spatial holographic technologies. She works on developing a RF and microwave spectrum analyzer for capturing and analyzing very large bandwidth RF signals. Some technologies involved in her research system integration include high frequency signal generators and various RF components, laser electro-optic modulation and diffraction devices, rare earth crystals at cryogenic temperatures, and multiple signal capture and analysis techniques. Her past research involved electromagnetic interference and compatibility, fuzzy logic, high order statistics, and lidar/ladar. Tia also was adjunct faculty at Montana State University from 2001 to 2010 and is an experienced instructor for digital logic design, electrical power generation and distribution, machines, analog circuits, and signal processing. Tia enjoys teaching and tutoring young people and has been a substitute teacher, tutor, or robot club coach, specializing in math and science for grades K-8 since 1999.


 Diane Wesen Harn

 Administrative Associate IV

Phone: 406.994.7596

Phone: 406.994.6279



 Diane joined the Spectrum Lab in June of 2014.