Dr. Thomas Ehrenreich
Sr. Scientist at Missile Defense Agency
SPIE Involvement:
Conference Program Committee | Author
Area of Expertise:
Laser , Fiber , Atomics , Amplifiers , Experimental , Physics
Profile Summary

Development of narrow linewidth kilowatt class fiber lasers and amplifiers at 1µm and 2µm.
Lead scientist on custom-built amplifiers and lasers, government projects and Independent Research and Development. (IR&D).Manager for senior technologist and senior technician.
Experienced troubleshooter and problem solver on difficult projects.

Developed the first diode pumped alkali laser (DPAL) and Cesium vapor laser, with 81% slope efficiency and 65% optical-optical efficiency. High-precision lifetime measurements of the cesium 6P3/2 state using ultrafast laser pulse excitation and ionization.

Development of dual wavelength 1030nm & 1064nm 1.2 kW narrow linewidth Yt-doped fiber amplifier.

Spectral beam Combining of two 1.2-kW 1µm fiber amplifiers with air cooled volume Bragg grating, achieved output power of 2-kW with M2 < 1.16 of combined beam.

Development and delivery of three 700-Watt 1µm narrow linewidth polarization maintaining (PM) Ytterbium doped fiber amplifiers to major European defense manufacturer.

Development and delivery of three 1-kW 1µm narrow linewidth Ytterbium-doped fiber amplifiers with polarization control.

First demonstration of High Power 2130nm Holmium doped all glass fiber MOPA pumped by Thulium-doped fiber MOPA’s for US. Government program (JTO-HEL)

Development and delivery of 300-Watt 1101nm narrow linewidth PM Ytterbium-doped fiber amplifier to major U.S. Aero-space and defense manufacturer.

Development and delivery of six 1-kW 1µm narrow linewidth PM fiber amplifiers

Demonstration of 150-Watt 1.5µm Erbium-Ytterbium free-space coupled MOPA.

Development and delivery of 300-Watt all-glass 2µm Thulium-doped fiber MOPA.

First demonstration of 1-kW all-glass 2µm Thulium-doped fiber MOPA as subcontractor for U.S. Government program. (JTO-HEL)

Development and delivery of 20-Watt all-glass Thulium-doped single-frequency amplifier for major U.S. defense contractor.
Publications (9)

Proceedings Article | 22 February 2017 Paper
Proc. SPIE. 10083, Fiber Lasers XIV: Technology and Systems
KEYWORDS: Fiber amplifiers, Optical amplifiers, Photonic crystal fibers, Silica, Polarization, Scattering, Cladding, Diagnostics, Photonic crystals, Amplifiers, Structured optical fibers, Ytterbium

SPIE Journal Paper | 2 September 2016
OE Vol. 55 Issue 09
KEYWORDS: Fiber amplifiers, Diffractive optical elements, Optical amplifiers, Polarization, Beam splitters, Phase modulation, High power fiber amplifiers, Modulation, Phase shift keying, Signal attenuation

Proceedings Article | 9 March 2016 Paper
Proc. SPIE. 9728, Fiber Lasers XIII: Technology, Systems, and Applications
KEYWORDS: Clocks, Modulation, Cladding, Amplifiers, Ytterbium

Proceedings Article | 20 March 2015 Paper
Proc. SPIE. 9344, Fiber Lasers XII: Technology, Systems, and Applications
KEYWORDS: Fiber amplifiers, Optical amplifiers, Clocks, Phase modulation, Modulation, Laser scattering, Phase shift keying, Fiber lasers, Binary data, Visibility

Proceedings Article | 4 March 2015 Paper
Proc. SPIE. 9344, Fiber Lasers XII: Technology, Systems, and Applications
KEYWORDS: Multimode fibers, Fiber amplifiers, Optical amplifiers, Oscillators, Modulation, Light scattering, Laser applications, Amplifiers, Fiber lasers, Acoustics

Showing 5 of 9 publications
Conference Committee Involvement (1)
Laser Technology for Defense and Security XVI
12 April 2021 | Online Only, Florida, United States
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