Computer modeling and analysis of high energy particle pumped gas lasers

Thesis/Dissertation · Thu Jan 01 00:00:00 EST 1981

OSTI ID:6232147

Lim, S S

Modeling of direct nuclear pumped (DNP) laser systems is carried out in support of laboratory and reactor experiments. The extensive model codes developed in previous years have been expanded to include details of high energy particle deposition, photoionization and excited state absorption processes. The goal of this study is to provide a reliable framework for the planning and interpretation of DNP laser experiments. The expanded numerical codes are summarized. The laser system of primary interest is the XeF C-A transition at 480 nm. Calculations presented here cover both direct pumped and photolytically pumped excimer systems. High pressure, /sup 3/He seeded, direct reactor pumped calculations are presented in support of experiments performed on the Aberdeen reactor. High energy deposition experiments planned for the AURORA facility are also outlined. In these experiments gamma rays are used to pump liquid xenon followed by 172 nm fluorescence which photodissociates XeF2. These latter calculations predict substantial lasing even though the maximum efficiency for laser energy out/gamma ray energy in is small, primarily due to a small optical view factor. For the infrared CO laser system, fundamental difficulties appear which suggest limitations for a high energy particle pumping scheme. Although high electron densities are produced under high energy deposition conditions, the large low energy vibrational cross sections lead to rather low mean electron temperatures. The observation of gain in CO under fission fragment pumping is shown to be consistent with a pumping mechanism from electronic quenching and ionic recombination processes.

• OSTI ID: 6232147
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CARBON MONOXIDE LASERS
NUCLEAR PUMPING
GAS LASERS
OPTICAL PUMPING
COMPUTERIZED SIMULATION
FISSION FRAGMENTS
THEORETICAL DATA
XENON FLUORIDES
DATA
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
LASERS
NUCLEAR FRAGMENTS
NUMERICAL DATA
PUMPING
RARE GAS COMPOUNDS
SIMULATION
XENON COMPOUNDS
420300* - Engineering- Lasers- (-1989)