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Dive into the research topics where Joseph D. Rowley is active.

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Featured researches published by Joseph D. Rowley.


Optics Letters | 2012

Broadband terahertz pulse emission from ZnGeP 2

Joseph D. Rowley; J. K. Pierce; A.T. Brant; L. E. Halliburton; N. C. Giles; Peter G. Schunemann; Alan D. Bristow

Optical rectification is demonstrated in (110)-cut ZnGeP(2) (ZGP) providing broadband terahertz (THz) generation. The source is compared to both GaP and GaAs over a wavelength range of 1150 nm to 1600 nm and peak-intensity range of 0.5 GW/cm(2) to 40 GW/cm(2). ZGP peak-to-peak field amplitude is larger than in the other materials due to either lower nonlinear absorption or larger second-order nonlinearity. This material is well suited for broadband THz generation across a wide range of infrared excitation wavelengths.


Optics Express | 2012

Terahertz generation by optical rectification in uniaxial birefringent crystals

Joseph D. Rowley; J. K. Wahlstrand; Kevin T. Zawilski; Peter G. Schunemann; N. C. Giles; Alan D. Bristow

The angular dependence of terahertz (THz) emission from birefringent crystals can differ significantly from that of cubic crystals. Here we consider optical rectification in uniaxial birefringent materials, such as chalcopyrite crystals. The analysis is verified in (110)-cut ZnGeP2 and compared to (zincblende) GaP. Although the crystals share the same nonzero second-order tensor elements, the birefringence in chalcopyrite crystals cause the pump pulse polarization to evolve as it propagates through the crystal, resulting in a drastically different angular dependence in chalcopyrite crystals. The analysis is extended to {012}- and {114}-cut chalcopyrite crystals and predicts more efficient conversion for the {114} crystal cut over the {012}- and {110}-cuts.


Applied Physics Letters | 2009

Efficient picosecond optical parametric oscillator based on periodically poled lithium tantalate

Kalyan V. Bhupathiraju; Joseph D. Rowley; Feruz Ganikhanov

Generation of transform limited picosecond pulses continuously tunable across wavelengths in the near-infrared (995–1340 nm) and midinfrared (2.1–3.6 μm) range is demonstrated in an optical parametric oscillator (OPO) based on a periodically poled stoichiometric lithium tantalate crystal. The OPO, which is synchronously pumped by a mode-locked Ti:sapphire laser, delivers about 1 W in combined average power at a repetition rate of 74 MHz, which represents close to 45% extraction efficiency in output power. With wavelength and bandwidth controlled via an intracavity diffraction grating, about 2.7 ps pulses with 3.8–10.9 cm−1 bandwidth (full width at half maximum) were generated across the tuning range in the near-infrared thus making the OPO an optimal source for use in various nonlinear spectroscopy and microscopy applications that require high spectral resolution.


conference on lasers and electro optics | 2012

Properties of broadband terahertz generation in birefringent ZnGeP 2

Joseph D. Rowley; Alan D. Bristow; Peter G. Schunemann

Generation of terahertz pulses by optical rectification is demonstrated in chalcopyrite ZnGeP2 (ZGP) as a function of pump intensity, wavelength and crystal orientation. For infrared excitation, ZGP emission exceeds that of GaAs and GaP.


ACS Catalysis | 2013

Photocatalytic Water Oxidation by Hematite/Reduced Graphene Oxide Composites

Fanke Meng; Jiangtian Li; Scott K. Cushing; Joeseph Bright; Mingjia Zhi; Joseph D. Rowley; Zhanglian Hong; Ayyakkannu Manivannan; Alan D. Bristow; Nianqiang Wu


Journal of The Optical Society of America B-optical Physics | 2013

Terahertz emission from ZnGeP 2 : phase-matching, intensity, and length scalability

Joseph D. Rowley; Derek A. Bas; Kevin T. Zawilski; Peter G. Schunemann; Alan D. Bristow


Applied Physics B | 2013

Multi-color ultrafast laser platform for nonlinear optical imaging based on independently tunable optical parametric oscillators

Shan Yang; Sanjay Adhikari; Manoj Dobbala; Sasidhar Adusumilli; Joseph D. Rowley; Feruz Ganikhanov; Lingquin Zhang; Glen S. Marrs; Robert Wysolmerski; George A. Spirou


Bulletin of the American Physical Society | 2013

Semiconductor-core optical fibers for terahertz waveguides

Derek A. Bas; Scott K. Cushing; Joseph D. Rowley; John Ballato; R. Rice; Alan D. Bristow


Bulletin of the American Physical Society | 2013

Velocity-matching dispersion maps for zincblende and chalcopyrite terahertz sources

Joseph D. Rowley; Kevin T. Zawilski; Peter G. Schunemann; Derek A. Bas; Alan D. Bristow


Journal of the Optical Society of America | 2011

Power and tuning characteristics of a broadly tunable femtosecond optical parametric oscillator based on periodically poled stoichiometric lithium tantalate

Joseph D. Rowley; Shan Yang; Feruz Ganikhanov

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Derek A. Bas

West Virginia University

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Shan Yang

West Virginia University

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N. C. Giles

Air Force Institute of Technology

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A.T. Brant

West Virginia University

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Ayyakkannu Manivannan

United States Department of Energy

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