Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Thomas Ehrenreich"'
Autor:
Roger Holten, Ken Rowland, Iyad Dajani, Brian Anderson, Thomas Ehrenreich, Angel Flores, Nader A. Naderi
Publikováno v:
2019 IEEE Research and Applications of Photonics in Defense Conference (RAPID).
We present an overview of fiber amplifier power-scaling and beam-combining at AFRL. Nonlinear mitigation and power-scaling results of kW amplifiers is discussed. Here nonlinear suppression is attained through phase modulation and laser gain competiti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::da50363db1952644df8ad02304e2108d
https://doi.org/10.1109/rapid.2019.8864407
https://doi.org/10.1109/rapid.2019.8864407
Autor:
Brian Anderson, Thomas Ehrenreich, Benjamin G. Ward, Benjamin Pulford, Cody Mart, Tony Sanchez, Iyad Dajani, Khanh Kieu
Publikováno v:
SPIE Proceedings.
Hybrid microstructured fibers, utilizing both air holes and high index cladding structures, provide important advantages over conventional fiber including robust fundamental mode operation with large core diameters (>30μm) and spectral filtering (i.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2b29feff44feb975e69f0f431f0b314e
https://doi.org/10.1117/12.2249863
https://doi.org/10.1117/12.2249863
Publikováno v:
Conference on Lasers and Electro-Optics.
An acoustic and gain tailored photonic crystal fiber (PCF), and a hybrid microstructured fiber, were used to demonstrate near diffraction limited output powers of 1160W and 820W, respectively, with spectral linewidths ≤1GHz. Both amplifiers suffici
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c1069dde72912128acf040710b01aed0
https://doi.org/10.1364/cleo_si.2017.sm1l.1
https://doi.org/10.1364/cleo_si.2017.sm1l.1
Publikováno v:
SPIE Proceedings.
We report results from two ~1.5 kW Yb-doped fiber amplifiers with comparable optical to optical efficiencies and linewidths. One amplifier utilized a fiber with a core diameter of 25 μm while the core diameter of the fiber utilized in the other ampl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::60ed4ff9ab1bbe1e12f18a02f44c69d6
https://doi.org/10.1117/12.2218216
https://doi.org/10.1117/12.2218216
Autor:
Brian Anderson, Ken Rowland, Angel Flores, Nader A. Naderi, Anthony D. Sanchez, Roger Holten, Iyad Dajani, Thomas Ehrenreich
Publikováno v:
Frontiers in Optics 2016.
We present multi-kW power scaling results of narrow line Yb-doped fiber amplifiers. Nonlinear suppression is attained through pseudo-random modulation. Subsequently, 5 pseudorandom modulated kW amplifiers were coherently combined into a 5kW beam.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c85a5db6d7ae86f8a8bdc8cbd3d38d11
https://doi.org/10.1364/fio.2016.fw5b.1
https://doi.org/10.1364/fio.2016.fw5b.1
Publikováno v:
SPIE Proceedings.
White noise phase modulation (WNS) and pseudo-random binary sequence phase modulation (PRBS) are effective techniques for mitigation of nonlinear effects such as stimulated Brillouin scattering (SBS); thereby paving the way for higher power narrow li
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b9b86db6e516069f16e74bd85d6c5b2a
https://doi.org/10.1117/12.2082713
https://doi.org/10.1117/12.2082713
Autor:
Benjamin Pulford, Roger Holten, Iyad Dajani, Thomas Hawkins, Christopher Vergien, Fanting Kong, Thomas Ehrenreich, Liang Dong, Cody Mart, Guancheng Gu, Nader A. Naderi
Publikováno v:
SPIE Proceedings.
Ytterbium-doped large mode area all-solid photonic bandgap fiber amplifiers were used to demonstrate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::21303635ebf1e88f8048f9e50257e193
https://doi.org/10.1117/12.2082709
https://doi.org/10.1117/12.2082709
Autor:
G. Brooke, B. M. Patterson, Randy Knize, M. A. Gearba, J. Scoville, Thomas Ehrenreich, Jerry Sell
Publikováno v:
Physical Review A. 91
The cesium 6${P}_{3/2}$ excited-state lifetime is measured using ultrafast laser pulse excitation and ionization in counterpropagating thermal atomic beams achieving an overall uncertainty of 0.15%, which represents a modest improvement over the best
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7d5fee76ba15cbb409178355627d623e
https://doi.org/10.1103/physreva.91.012506
https://doi.org/10.1103/physreva.91.012506
Autor:
S. J. Smith, Q. C. Kessel, N. Djuric, Winthrop Smith, J. A. Lozano, K. Miller, P. Gee, Thomas Ehrenreich, E. Pollack, Ara Chutjian
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 241:125-128
As part of an investigation of the interactions between solar-wind ions and cometary gases, UV/X-ray and optical measurements of the photons resulting from collisions of O5+ with CO have been made. Although O5+ is not a major solar-wind ion, its inte
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::304261579ef8af1fbf83178354936c9b
https://doi.org/10.1016/j.nimb.2005.07.075
https://doi.org/10.1016/j.nimb.2005.07.075
Autor:
Thomas Ehrenreich, Benjamin Pulford, Fanting Kong, Liang Dong, Iyad Dajani, Thomas Hawkins, Guancheng Gu, Christopher Vergien, Roger Holten
Publikováno v:
Advanced Photonics.
A ytterbium-doped all-solid photonic bandgap fiber laser with an approximately 50µm core diameter has been demonstrated with an efficiency of ~70% and good beam quality (M2
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::786d87df6fbe1620df7437d5901e0755
https://doi.org/10.1364/sof.2014.sotu4b.3
https://doi.org/10.1364/sof.2014.sotu4b.3