共 21 条
Carrier-envelope-phase-stable, 1.2 mJ, 1.5 cycle laser pulses at 2.1 μm
被引:147
作者:

Deng, Yunpei
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机构:
Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Schwarz, Alexander
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Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Fattahi, Hanieh
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Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Ueffing, Moritz
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Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Gu, Xun
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Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Ossiander, Marcus
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Max Planck Inst Quantum Opt, D-85748 Garching, Germany
Tech Univ Munich, Dept Phys, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Metzger, Thomas
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Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Pervak, Volodymyr
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机构:
Univ Munich, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Ishizuki, Hideki
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机构:
Natl Inst Nat Sci, Inst Mol Sci, Okazaki, Aichi 4448585, Japan Max Planck Inst Quantum Opt, D-85748 Garching, Germany

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Kobayashi, Takayoshi
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机构:
Univ Electrocommun, Adv Ultrafast Laser Res Ctr, Chofu, Tokyo 1828585, Japan
Japan Sci & Technol Agcy JST, Core Res Evolut Sci & Technol CREST, Chiyoda Ku, Tokyo 1020075, Japan Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Marcus, Gilad
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Max Planck Inst Quantum Opt, D-85748 Garching, Germany
Hebrew Univ Jerusalem, Benin Sch Engn & Comp Sci, IL-91904 Jerusalem, Israel Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Krausz, Ferenc
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Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Kienberger, Reinhard
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h-index: 0
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Max Planck Inst Quantum Opt, D-85748 Garching, Germany
Tech Univ Munich, Dept Phys, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Karpowicz, Nicholas
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Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany
机构:
[1] Max Planck Inst Quantum Opt, D-85748 Garching, Germany
[2] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
[3] Univ Munich, D-85748 Garching, Germany
[4] Natl Inst Nat Sci, Inst Mol Sci, Okazaki, Aichi 4448585, Japan
[5] Univ Electrocommun, Adv Ultrafast Laser Res Ctr, Chofu, Tokyo 1828585, Japan
[6] Japan Sci & Technol Agcy JST, Core Res Evolut Sci & Technol CREST, Chiyoda Ku, Tokyo 1020075, Japan
[7] Hebrew Univ Jerusalem, Benin Sch Engn & Comp Sci, IL-91904 Jerusalem, Israel
基金:
日本科学技术振兴机构;
关键词:
OPTICAL PARAMETRIC-AMPLIFIER;
HARMONIC-GENERATION;
ATTOSECOND PULSES;
AMPLIFICATION;
REGIME;
ULTRABROADBAND;
STABILIZATION;
2.1-MU-M;
D O I:
10.1364/OL.37.004973
中图分类号:
O43 [光学];
学科分类号:
070207 ;
0803 ;
摘要:
We produce 1.5 cycle (10.5 fs), 1.2 mJ, 3 kHz carrier-envelope-phase-stable pulses at 2.1 mu m carrier wavelength, from a three-stage optical parametric chirped-pulse amplifier system, pumped by an optically synchronized 1.6 ps Yb:YAG thin disk laser. A chirped periodically poled lithium niobate crystal is used to generate the ultrabroad spectrum needed for a 1.5 cycle pulse through difference frequency mixing of spectrally broadened pulse from a Ti:sapphire amplifier. It will be an ideal tool for producing isolated attosecond pulses with high photon energies. (C) 2012 Optical Society of America
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页码:4973 / 4975
页数:3
相关论文
共 21 条
[1]
90 GW peak power few-cycle mid-infrared pulses from an optical parametric amplifier
[J].
Andriukaitis, Giedrius
;
Balciunas, Tadas
;
Alisauskas, Skirmantas
;
Pugzlys, Audrius
;
Baltuska, Andrius
;
Popmintchev, Tenio
;
Chen, Ming-Chang
;
Murnane, Margaret M.
;
Kapteyn, Henry C.
.
OPTICS LETTERS,
2011, 36 (15)
:2755-2757

Andriukaitis, Giedrius
论文数: 0 引用数: 0
h-index: 0
机构:
Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria

Balciunas, Tadas
论文数: 0 引用数: 0
h-index: 0
机构:
Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria

Alisauskas, Skirmantas
论文数: 0 引用数: 0
h-index: 0
机构:
Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria

Pugzlys, Audrius
论文数: 0 引用数: 0
h-index: 0
机构:
Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria

Baltuska, Andrius
论文数: 0 引用数: 0
h-index: 0
机构:
Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria

Popmintchev, Tenio
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria

Chen, Ming-Chang
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria

Murnane, Margaret M.
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria

Kapteyn, Henry C.
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria
[2]
Controlling the carrier-envelope phase of ultrashort light pulses with optical parametric amplifiers
[J].
Baltuska, A
;
Fuji, T
;
Kobayashi, T
.
PHYSICAL REVIEW LETTERS,
2002, 88 (13)
:4-133901

Baltuska, A
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Tokyo, Fac Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan Univ Tokyo, Fac Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

Fuji, T
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Tokyo, Fac Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan Univ Tokyo, Fac Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

论文数: 引用数:
h-index:
机构:
[3]
High-harmonic generation of attosecond pulses in the ''single-cycle'' regime
[J].
Christov, IP
;
Murnane, MM
;
Kapteyn, HC
.
PHYSICAL REVIEW LETTERS,
1997, 78 (07)
:1251-1254

Christov, IP
论文数: 0 引用数: 0
h-index: 0
机构:
UNIV SOFIA,DEPT PHYS,BU-1126 SOFIA,BULGARIA UNIV SOFIA,DEPT PHYS,BU-1126 SOFIA,BULGARIA

Murnane, MM
论文数: 0 引用数: 0
h-index: 0
机构:
UNIV SOFIA,DEPT PHYS,BU-1126 SOFIA,BULGARIA UNIV SOFIA,DEPT PHYS,BU-1126 SOFIA,BULGARIA

Kapteyn, HC
论文数: 0 引用数: 0
h-index: 0
机构:
UNIV SOFIA,DEPT PHYS,BU-1126 SOFIA,BULGARIA UNIV SOFIA,DEPT PHYS,BU-1126 SOFIA,BULGARIA
[4]
Generation of 45 femtosecond pulses at 3 μm with a KNbO3 optical parametric amplifier
[J].
Fecko, CJ
;
Loparo, JJ
;
Tokmakoff, A
.
OPTICS COMMUNICATIONS,
2004, 241 (4-6)
:521-528

Fecko, CJ
论文数: 0 引用数: 0
h-index: 0
机构: MIT, Dept Chem, Cambridge, MA 02139 USA

Loparo, JJ
论文数: 0 引用数: 0
h-index: 0
机构: MIT, Dept Chem, Cambridge, MA 02139 USA

Tokmakoff, A
论文数: 0 引用数: 0
h-index: 0
机构: MIT, Dept Chem, Cambridge, MA 02139 USA
[5]
Parametric amplification of few-cycle carrier-envelope phase-stable pulses at 2.1 μm
[J].
Fuji, T
;
Ishii, N
;
Teisset, CY
;
Gu, X
;
Metzger, T
;
Baltuska, A
;
Forget, N
;
Kaplan, D
;
Galvanauskas, A
;
Krausz, F
.
OPTICS LETTERS,
2006, 31 (08)
:1103-1105

Fuji, T
论文数: 0 引用数: 0
h-index: 0
机构: Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Ishii, N
论文数: 0 引用数: 0
h-index: 0
机构: Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Teisset, CY
论文数: 0 引用数: 0
h-index: 0
机构: Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Gu, X
论文数: 0 引用数: 0
h-index: 0
机构: Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Metzger, T
论文数: 0 引用数: 0
h-index: 0
机构: Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Baltuska, A
论文数: 0 引用数: 0
h-index: 0
机构: Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Forget, N
论文数: 0 引用数: 0
h-index: 0
机构: Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Kaplan, D
论文数: 0 引用数: 0
h-index: 0
机构: Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Galvanauskas, A
论文数: 0 引用数: 0
h-index: 0
机构: Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Krausz, F
论文数: 0 引用数: 0
h-index: 0
机构: Max Planck Inst Quantum Opt, D-85748 Garching, Germany
[6]
Self-stabilization of carrier-envelope offset phase by use of difference-frequency generation
[J].
Fuji, T
;
Apolonski, A
;
Krausz, F
.
OPTICS LETTERS,
2004, 29 (06)
:632-634

Fuji, T
论文数: 0 引用数: 0
h-index: 0
机构: Vienna Tech Univ, Photon Inst, A-1040 Vienna, Austria

Apolonski, A
论文数: 0 引用数: 0
h-index: 0
机构: Vienna Tech Univ, Photon Inst, A-1040 Vienna, Austria

Krausz, F
论文数: 0 引用数: 0
h-index: 0
机构: Vienna Tech Univ, Photon Inst, A-1040 Vienna, Austria
[7]
Attosecond control and measurement: Lightwave electronics
[J].
Goulielmakis, E.
;
Yakovlev, V. S.
;
Cavalieri, A. L.
;
Uiberacker, M.
;
Pervak, V.
;
Apolonski, A.
;
Kienberger, R.
;
Kleineberg, U.
;
Krausz, F.
.
SCIENCE,
2007, 317 (5839)
:769-775

Goulielmakis, E.
论文数: 0 引用数: 0
h-index: 0
机构: MPQ, D-85748 Garching, Germany

Yakovlev, V. S.
论文数: 0 引用数: 0
h-index: 0
机构: MPQ, D-85748 Garching, Germany

Cavalieri, A. L.
论文数: 0 引用数: 0
h-index: 0
机构: MPQ, D-85748 Garching, Germany

Uiberacker, M.
论文数: 0 引用数: 0
h-index: 0
机构: MPQ, D-85748 Garching, Germany

Pervak, V.
论文数: 0 引用数: 0
h-index: 0
机构: MPQ, D-85748 Garching, Germany

Apolonski, A.
论文数: 0 引用数: 0
h-index: 0
机构: MPQ, D-85748 Garching, Germany

Kienberger, R.
论文数: 0 引用数: 0
h-index: 0
机构: MPQ, D-85748 Garching, Germany

Kleineberg, U.
论文数: 0 引用数: 0
h-index: 0
机构: MPQ, D-85748 Garching, Germany

Krausz, F.
论文数: 0 引用数: 0
h-index: 0
机构: MPQ, D-85748 Garching, Germany
[8]
Generation of carrier-envelope-phase-stable 2-cycle 740-μJ pulses at 2.1-μm carrier wavelength
[J].
Gu, Xun
;
Marcus, Gilad
;
Deng, Yunpei
;
Metzger, Thomas
;
Teisset, Catherine
;
Ishii, Nobuhisa
;
Fuji, Takao
;
Baltuska, Andrius
;
Butkus, Rytis
;
Pervak, Volodymyr
;
Ishizuki, Hideki
;
Taira, Takunori
;
Kobayashi, Takayoshi
;
Kienberger, Reinhard
;
Krausz, Ferenc
.
OPTICS EXPRESS,
2009, 17 (01)
:62-69

Gu, Xun
论文数: 0 引用数: 0
h-index: 0
机构:
Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Marcus, Gilad
论文数: 0 引用数: 0
h-index: 0
机构:
Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Deng, Yunpei
论文数: 0 引用数: 0
h-index: 0
机构:
Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Metzger, Thomas
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Munich, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Teisset, Catherine
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Munich, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Ishii, Nobuhisa
论文数: 0 引用数: 0
h-index: 0
机构:
Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Fuji, Takao
论文数: 0 引用数: 0
h-index: 0
机构:
Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Baltuska, Andrius
论文数: 0 引用数: 0
h-index: 0
机构:
Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Butkus, Rytis
论文数: 0 引用数: 0
h-index: 0
机构:
Vilnius State Univ, Laser Res Ctr, LT-10223 Vilnius, Lithuania Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Pervak, Volodymyr
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Munich, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Ishizuki, Hideki
论文数: 0 引用数: 0
h-index: 0
机构:
Inst Mol Sci, Okazaki, Aichi 4448585, Japan Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Taira, Takunori
论文数: 0 引用数: 0
h-index: 0
机构:
Inst Mol Sci, Okazaki, Aichi 4448585, Japan Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Kobayashi, Takayoshi
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Electrocommun, Dept Appl Phys & Chem, Tokyo 1828585, Japan
Univ Electrocommun, Inst Laser Sci, Tokyo 1828585, Japan
JST, ICORP, Ultrashort Pulse Laser Project, Kawaguchi, Saitama 3320012, Japan Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Kienberger, Reinhard
论文数: 0 引用数: 0
h-index: 0
机构:
Max Planck Inst Quantum Opt, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany

Krausz, Ferenc
论文数: 0 引用数: 0
h-index: 0
机构:
Max Planck Inst Quantum Opt, D-85748 Garching, Germany
Univ Munich, D-85748 Garching, Germany Max Planck Inst Quantum Opt, D-85748 Garching, Germany
[9]
Ultrabroadband, highly flexible amplifier for ultrashort midinfrared laser pulses based on aperiodically poled Mg:LiNbO3
[J].
Heese, C.
;
Phillips, C. R.
;
Gallmann, L.
;
Fejer, M. M.
;
Keller, U.
.
OPTICS LETTERS,
2010, 35 (14)
:2340-2342

Heese, C.
论文数: 0 引用数: 0
h-index: 0
机构:
ETH, Inst Quantum Elect, Dept Phys, CH-8093 Zurich, Switzerland ETH, Inst Quantum Elect, Dept Phys, CH-8093 Zurich, Switzerland

Phillips, C. R.
论文数: 0 引用数: 0
h-index: 0
机构:
Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA ETH, Inst Quantum Elect, Dept Phys, CH-8093 Zurich, Switzerland

Gallmann, L.
论文数: 0 引用数: 0
h-index: 0
机构:
ETH, Inst Quantum Elect, Dept Phys, CH-8093 Zurich, Switzerland ETH, Inst Quantum Elect, Dept Phys, CH-8093 Zurich, Switzerland

Fejer, M. M.
论文数: 0 引用数: 0
h-index: 0
机构:
Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA ETH, Inst Quantum Elect, Dept Phys, CH-8093 Zurich, Switzerland

Keller, U.
论文数: 0 引用数: 0
h-index: 0
机构:
ETH, Inst Quantum Elect, Dept Phys, CH-8093 Zurich, Switzerland ETH, Inst Quantum Elect, Dept Phys, CH-8093 Zurich, Switzerland
[10]
High-energy, phase-stable, ultrabroadband kHz OPCPA at 2.1 μm pumped by a picosecond cryogenic Yb:YAG laser
[J].
Hong, Kyung-Han
;
Huang, Shu-Wei
;
Moses, Jeffrey
;
Fu, Xing
;
Lai, Chien-Jen
;
Cirmi, Giovanni
;
Sell, Alexander
;
Granados, Eduardo
;
Keathley, Phillip
;
Kaertner, Franz X.
.
OPTICS EXPRESS,
2011, 19 (16)
:15538-15548

Hong, Kyung-Han
论文数: 0 引用数: 0
h-index: 0
机构:
MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
MIT, Elect Res Lab, Cambridge, MA 02139 USA MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

Huang, Shu-Wei
论文数: 0 引用数: 0
h-index: 0
机构:
MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
MIT, Elect Res Lab, Cambridge, MA 02139 USA MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

Moses, Jeffrey
论文数: 0 引用数: 0
h-index: 0
机构:
MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
MIT, Elect Res Lab, Cambridge, MA 02139 USA MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

Fu, Xing
论文数: 0 引用数: 0
h-index: 0
机构:
MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
MIT, Elect Res Lab, Cambridge, MA 02139 USA MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

Lai, Chien-Jen
论文数: 0 引用数: 0
h-index: 0
机构:
MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
MIT, Elect Res Lab, Cambridge, MA 02139 USA MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

Cirmi, Giovanni
论文数: 0 引用数: 0
h-index: 0
机构:
MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
MIT, Elect Res Lab, Cambridge, MA 02139 USA MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

Sell, Alexander
论文数: 0 引用数: 0
h-index: 0
机构:
MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
MIT, Elect Res Lab, Cambridge, MA 02139 USA MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

Granados, Eduardo
论文数: 0 引用数: 0
h-index: 0
机构:
MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
MIT, Elect Res Lab, Cambridge, MA 02139 USA MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

Keathley, Phillip
论文数: 0 引用数: 0
h-index: 0
机构:
MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
MIT, Elect Res Lab, Cambridge, MA 02139 USA MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

Kaertner, Franz X.
论文数: 0 引用数: 0
h-index: 0
机构:
MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
MIT, Elect Res Lab, Cambridge, MA 02139 USA
Univ Hamburg, Dept Phys, Hamburg, Germany
Univ Hamburg, DESY Ctr Free Electron Laser Sci, Hamburg, Germany MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA