Dr. Glen P. Perram
Professor of Physics at Air Force Institute of Technology
SPIE Involvement:
Author | Instructor
Area of Expertise:
Gas Laser , Kinetics , Hyperspectral Imagery , Spectroscopy , Remote Sensing
Profile Summary

Dr. Glen Perram has served as a Professor of Physics at the Air Force Institute of Technology since 1989. He earned a B.S. in Applied and Engineering Physics from Cornell University in 1980 and his Ph.D. in Physics from AFIT in 1986. Dr. Perram received the 2013 Air Force Outstanding Civilian Senior Scientist Award for his work on Diode Pumped Alkali Lasers, is a fellow of the Directed Energy Professional Society, a registered professional engineer in the State of Ohio, and received the General Bernard A. Schriever Award for advancing aerospace power in 1995.
Publications (85)

SPIE Journal Paper | 22 October 2020
OE Vol. 60 Issue 03

SPIE Journal Paper | 11 January 2020
OE Vol. 59 Issue 10
KEYWORDS: Molybdenum, Phase modulation, Digital holography, Temporal coherence, Modulation, Holograms, Phase shift keying, Signal to noise ratio, Visibility, Optical engineering

Proceedings Article | 6 September 2019 Paper
Proc. SPIE. 11135, Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2019
KEYWORDS: Signal to noise ratio, Oscillators, Digital holography, Coherence (optics), Data modeling, Phase modulation, Modulation, Sensors, Digital imaging, Molybdenum

Proceedings Article | 6 September 2019 Paper
Proc. SPIE. 11135, Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2019
KEYWORDS: Signal to noise ratio, Continuous wave operation, Oscillators, Digital holography, Phase modulation, Signal attenuation, Molybdenum, Visibility

SPIE Journal Paper | 23 August 2019
OE Vol. 58 Issue 08

Showing 5 of 85 publications
Course Instructor
SC1036: Diode Pumped Alkali Lasers
The quest for a high power, electrically driven laser with excellent thermal management, lightweight packaging, and high brightness for tactical military applications may be realized with the advent of the Diode Pumped Alkali Laser (DPAL). The concept of using a gas phase medium for the phasing of large diode arrays via a highly efficient, cyclical photon engine combines the best features of electrically driven lasers with the inherent thermal management advantages of a gas lasers. Indeed, the DPAL concept has sparked great interest within the Directed Energy community resulting in a number of recent low power, highly efficient laser demonstrations. A modest national effort is underway to exploit this technology for military applications. Early laser demonstrations of the Diode Pumped Alkali Laser achieved output powers of 1-3 W in both rubidium and cesium with slope efficiencies as high as 82%. More recently, cw output powers as high as 145 W with in-band slope efficiencies of 28% have been reported. The system is a three level laser pumped by diode bars on the D2 transition, exciting the first 2P3/2 state of the alkali atom. Collisional relaxation to the 2P1/2 state is accomplished with a spin orbit relaxing gas such as ethane or methane, while pressure broadening of the absorption line has routinely been accomplished with He. The excited alkali atom then lases on the D1 line back to the ground state. Terminating the laser level at the ground state requires the gain volume to be fully bleached before achieving an inversion between the 2P1/2 and 2S1/2 states, resulting in pump threshold values of ~1 kW/cm2. This course will develop the background spectroscopy and kinetics of the DPAL system, summarize recent laser demonstrations, discuss narrow banding of diode pump sources, develop the key performance and scaling equations, and outline several issues in the development of these devices.
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