Mr. Bruce Odom Profile

Bruce Odom

at US Army Combat Capabilities Development Command

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Proceedings Article | 3 October 2024 Presentation + Paper

Ultrashort pulsed laser research results at the U.S. Army DEVCOM Analysis Center

Daniel Short, Bryan Holtsberry, Ivan Dragulin, Bruce Odom

Proceedings Volume 13147, 1314702 (2024) https://doi.org/10.1117/12.3029591

KEYWORDS: Supercontinuum generation, Atmospheric propagation, Spectrographs, Sapphire, Spectral calibration, Mirrors, Collimators, Zinc sulfide, Sensors, Pulsed laser operation

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This paper describes research conducted by the U.S. Army Combat Capabilities Development Command (DEVCOM) Analysis Center (DAC) to characterize the supercontinuum (SC) effect generated from interactions between ultrashort pulsed lasers (USPL) and commonly used optical materials. The well-known supercontinuum effect occurs when an optical material is irradiated by a laser with pulses of temporal width typically in the femtosecond regime. Interactions between the laser pulses and the material will induce a time dependent self-phase modulation, which leads to an apparent frequency modulation resulting in radiation emitted from the material as a “white light” laser.

Supercontinuum can be generated in many commonly used dielectric materials, otherwise known as bulk materials. The generation of SC in these bulk materials has been well documented and is easily achieved in an indoor laboratory setting. However, inducing SC generation (SCG) in an outdoor setting through atmosphere has not been reported as frequently. We conducted an outdoor experiment at DAC’s Electro-Optical Vulnerability Analysis Facility (EOVAF) laser range in July of 2023. An USPL was used to irradiate an optical collimating system several hundred meters from the USPL with several different bulk materials placed at its exit aperture using a spectrometer system to measure the SCG induced in the materials. After the outdoor experiment was completed, the spectrometer was calibrated using a quartz tungsten halogen (QTH) lamp. The calibration data were used to create a spectral response function which was applied to the uncalibrated spectral data of the SCG resulting in calibrated measurements of spectral fluence.

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