Studies of photoexcitation for extreme ultraviolet lasers
Thesis/Dissertation
·
OSTI ID:6946923
A laser-produced plasma facility was constructed that is suitable for exciting very high densities of excited state ions and atoms for the production of extreme-ultraviolet lasers. This facility includes a high power Nd:YAG-glass system, which generates laser pulses at 1.06 ..mu..m with a duration of 0.1 to 1 ns with energies of 2 to 20 Joules, and a dye laser system which can produce tunable laser pulses of 20 ps duration with energies of 1 to 3 mJ. A new synchronously pumped oscillator was designed for the dye laser system to provide high power, broadly tunable, picosecond pulses would be appropriate for transferring or measuring excited-state populations. This facility has been used to generate x-rays from a laser-produced plasma on a tantalum target in order to photoionize core electrons in Li vapor to produce excited Li ions. Measurements of the Li/sup +/(1s2s)/sup 3/S metastable ion and Li/sup +/(1s3s)/sup 3/S ion densities were performed to study the dependences of these populations on time, Li pressure, laser energy, and distance from the target. Metastable densities as high as 3 x 10/sup 15/ cm/sup -3/ were achieved in the Li/sup +/ (1s2d)/sup 3/S state at 2 mm from the target with 2.3 joules of laser energy.
- Research Organization:
- Stanford Univ., CA (USA)
- OSTI ID:
- 6946923
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CATIONS
CHARGED PARTICLES
DYE LASERS
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
EXCITED STATES
EXTREME ULTRAVIOLET RADIATION
ION SOURCES
IONIZATION
IONIZING RADIATIONS
IONS
LASER-PRODUCED PLASMA
LASERS
LIQUID LASERS
LITHIUM IONS
PHOTOIONIZATION
PLASMA
PULSES
RADIATIONS
SOLID STATE LASERS
TUNING
ULTRAVIOLET RADIATION
X RADIATION
420300* -- Engineering-- Lasers-- (-1989)
640301 -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CATIONS
CHARGED PARTICLES
DYE LASERS
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
EXCITED STATES
EXTREME ULTRAVIOLET RADIATION
ION SOURCES
IONIZATION
IONIZING RADIATIONS
IONS
LASER-PRODUCED PLASMA
LASERS
LIQUID LASERS
LITHIUM IONS
PHOTOIONIZATION
PLASMA
PULSES
RADIATIONS
SOLID STATE LASERS
TUNING
ULTRAVIOLET RADIATION
X RADIATION