Christian Keyser

Optical physicist physicist in pursuit of innovative advancements in nonlinear fiber sources and active imaging.

Research Expertise

Electrical and Electronic Engineering
Condensed Matter Physics
Anesthesiology and Pain Medicine
Atomic and Molecular Physics, and Optics

Legacy Map

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Publications

High conversion efficiency mass-limited Sn-based laser plasma source for extreme ultraviolet lithography
Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena
2004
Laboratory calibration of the Extreme-Ultraviolet Imaging Spectrometer for the Solar-B satellite
Applied Optics
2006
Charting a course to efficient difference frequency generation in molecular-engineered liquid-core fiber
Optics Express
2023
Modeling quasi-phase-matched electric-field-induced optical parametric amplification in hollow-core photonic crystal fibers
Optics Express
2021
Optics and mechanisms for the Extreme-Ultraviolet Imaging Spectrometer on the Solar-B satellite
Applied Optics
2006
Maximizing supercontinuum bandwidths in gas-filled hollow-core fibers using artificial neural networks
Journal of Applied Physics
2023
Single-pulse, Kerr-effect Mueller matrix LiDAR polarimeter
Optics Express
2020
Single-Pulse Mueller Matrix LiDAR Polarimeter: Modeling and Demonstration
IEEE Transactions on Geoscience and Remote Sensing
2019
Hybrid passive polarimetric imager and lidar combination for material classification
Optical Engineering
2020
Wavelength conversion through stimulated Raman scattering in an oxygen-filled fiber for multi-band LiDAR
Optics Letters
2024
Spectrally pure photons generated in a quasi-phase matched xenon-filled hollow-core photonic crystal fiber
Optics Express
2022
Dynamics of Mass-Limited Laser Plasma Targets as Sources for Extreme Ultraviolet Lithography
Japanese Journal of Applied Physics
2002
Analysis of quasi-phase-matched optical parametric amplification in hollow-core fibers using analytical static electric field solutions
Optics Express
2021
LADAR System and Algorithm Design for Spectropolarimetric Scene Characterization
IEEE Transactions on Geoscience and Remote Sensing
2018
Laser Plasma EUV Sources Based on Droplet Target Technology
EUV Sources for Lithography

Education

Optical Physics / December, 2003

Orlando, Florida, United States of America

Experience

Air Force Research Laboratory

Principal Physicist / June, 2012Present

• Principal investigator focused on applied research enabling disruptive technology advancements in active imaging and novel laser sources. • Invented/demonstrated temporally multiplexed spectropolarimetric LiDAR for low CSWAP sensor capable of automatic materials classification. • Developed system performance model to quantify probability of correct classification of materials as a function of system parameters. Effort involved development of a materials database, system model, signal processing, and machine learning techniques. • Currently investigating nonlinear optics in step-index silica fiber, and liquid/gas filled fiber for wavelength-agile, multispectral, and multipolarization laser sources. Utilizing Raman scattering, Kerr phase modulation, and electrostatic field induced quasi-phase matched difference frequency generation (QPM DFG). • Investigating photonic lantern wavefront sensors for sensor applications.

Northrop Grumman Laser Systems

Senior Electro-Optics Engineer / May, 2005June, 2012

• As the laser and threat identification system lead on an optical augmentation program, I led a team to develop a cutting-edge threat detection system based on optical augmentation using proprietary techniques to solve the clutter rejection problem and identify snipers using iron sites and rifle scopes. • As lead investigator, defined range finder architectures for future products to meet demanding CSWaP, accuracy and dynamic range requirements. • Invented a miniature diode pumped, Erbium glass laser employing a revolutionary pump-head and opto-mechanical design providing 10Hz, 5mJ, near diffraction limited, athermal performance while cutting the CSWaP. • Designed and tested a near diffraction limited, Erbium glass microchip laser for the ultra-low CSWaP rangefinder systems. • Constructed a high efficiency, intra-cavity second harmonic generated laser which provided 1W of green light for nonlethal dazzler system.

Artep Inc. at the Naval Research Laboratory

Physicist / August, 2002May, 2005

• Designed and constructed the optical test facilities that enabled the successful characterization of the multi-million dollar extreme ultraviolet and visible imaging spectrographs and coronographs launched on the Solar-B and Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI) missions. Assisted in testing of the instruments.

CREOL/UCF

PhD student / January, 1999May, 2003

• Dissertation: Optical and Spectral Characterization of Liquid Droplet EUV Laser Produced Plasmas Sources. • Designed and built multiple spectrographs to enable the characterization and optimization of EUV emission from the liquid droplet laser plasma. Built a nanosecond resolution, time resolved interferometer to characterize the droplet plasma expansion dynamics.

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