Investigation of optical-field ionized plasmas by Thomson scattering

被引:0
作者
Jost, CM [1 ]
Fill, EE [1 ]
机构
[1] Max Planck Inst Quantum Opt, D-85748 Garching, Germany
来源
ECLIM 2000: 26TH EUROPEAN CONFERENCE ON LASER INTERACTION WITH MATTER | 2001年 / 4424卷
关键词
optical-field ionization; Thomson scattering; diatomic molecules; Hydrogen; Deuterium; electron temperature; ion temperature; Coulomb explosion; spectral blueshift; alignment;
D O I
10.1117/12.425551
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Using Thomson scattering of laser light we have studied optical-field ionized Hydrogen and Deuterium plasmas with respect to electron density, electron temperature and ion temperature. The plasmas were created by focusing 120 fs, 790 nm pulses of our 10 Hz ATLAS (R) Ti:sapphire laser system to intensities of up to 7x10(16) W/cm(2). The measurements were performed for linear and elliptic polarization of the ionizing laser light. We find that the ion temperatures for Deuterium and Hydrogen are not identical, whereas the corresponding electron temperatures show no significant difference. Considering standard theory for optical-field ionization we would expect much higher electron temperatures for elliptic than for linear laser polarization. But for Deuterium the electron temperature for elliptic polarization is found to be even slightly lower than for linear polarization. Also in case of Hydrogen we find that the electron temperature is almost the same for linear and elliptic polarization. With increasing particle density ionization defocusing of the laser beam and heating of the electrons due to inverse bremsstrahlung gain in significance.
引用
收藏
页码:533 / 536
页数:4
相关论文
共 12 条
[1]   LASER IONIZATION OF NOBLE-GASES BY COULOMB-BARRIER SUPPRESSION [J].
AUGST, S ;
MEYERHOFER, DD ;
STRICKLAND, D ;
CHIN, SL .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1991, 8 (04) :858-867
[2]   COLD-PLASMA PRODUCTION FOR RECOMBINATION EXTREME-ULTRAVIOLET LASERS BY OPTICAL-FIELD-INDUCED IONIZATION [J].
BURNETT, NH ;
CORKUM, PB .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1989, 6 (06) :1195-1199
[3]   ABOVE-THRESHOLD IONIZATION IN THE LONG-WAVELENGTH LIMIT [J].
CORKUM, PB ;
BURNETT, NH ;
BRUNEL, F .
PHYSICAL REVIEW LETTERS, 1989, 62 (11) :1259-1262
[4]   IONIZATION AND DISSOCIATION OF DIATOMIC-MOLECULES IN INTENSE INFRARED-LASER FIELDS [J].
DIETRICH, P ;
CORKUM, PB .
JOURNAL OF CHEMICAL PHYSICS, 1992, 97 (05) :3187-3198
[5]   LASER LIGHT SCATTERING IN LABORATORY PLASMAS [J].
EVANS, DE ;
KATZENSTEIN, J .
REPORTS ON PROGRESS IN PHYSICS, 1969, 32 (02) :207-+
[6]   FOCUSING LIMITS OF ULTRASHORT LASER-PULSES - ANALYTICAL THEORY [J].
FILL, EE .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1994, 11 (11) :2241-2245
[7]   SUBPICOSECOND THOMSON SCATTERING MEASUREMENTS OF OPTICALLY IONIZED HELIUM PLASMAS [J].
GLOVER, TE ;
DONNELLY, TD ;
LIPMAN, EA ;
SULLIVAN, A ;
FALCONE, RW .
PHYSICAL REVIEW LETTERS, 1994, 73 (01) :78-81
[8]   DEMONSTRATION OF A 1O-HZ FEMTOSECOND PULSE-DRIVEN XUV LASER AT 41.8-NM IN XE-IX [J].
LEMOFF, BE ;
YIN, GY ;
GORDON, CL ;
BARTY, CPJ ;
HARRIS, SE .
PHYSICAL REVIEW LETTERS, 1995, 74 (09) :1574-1577
[9]   LASER-INDUCED MOLECULAR ALIGNMENT PROBED BY A DOUBLE-PULSE EXPERIMENT [J].
NORMAND, D ;
LOMPRE, LA ;
CORNAGGIA, C .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1992, 25 (20) :L497-L503
[10]   Double-pulse measurements of laser-induced alignment of molecules [J].
Posthumus, JH ;
Plumridge, J ;
Frasinski, LJ ;
Codling, K ;
Langley, AJ ;
Taday, PF .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1998, 31 (24) :L985-L993