Optical spectroscopy of laser plasma in a deep crater
- Natural Science Center, A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
- Institut fur Strahlwerkzeuge (IFSW), Universitat Stuttgart, Stuttgart (Germany)
The time dynamics of plasma-emission spectra is studied experimentally at different stages of the drilling of a steel plate by 100-fs and 5-ps laser pulses: from a shallow crater to a hole. The change in the time dependence of the plasma temperature caused by variations in the irradiated surface geometry is analysed. It is found that the time interval needed to reach a particular temperature (about 8000 K) drastically increases from 40-50 to 150-200 ns when a specific crater depth is achieved. The opposite tendency is observed as the crater depth grows further and a hole is produced. Strong self-absorption in a plasma plume inside a deep crater is experimentally confirmed which results in the appearance of line absorption against a continuous emission spectrum. (interaction of laser radiation with matter. laser plasma)
- OSTI ID:
- 21467138
- Journal Information:
- Quantum Electronics (Woodbury, N.Y.), Vol. 39, Issue 4; Other Information: DOI: 10.1070/QE2009v039n04ABEH013781; ISSN 1063-7818
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DRILLING
ELECTRON TEMPERATURE
EMISSION SPECTRA
HOLES
ION TEMPERATURE
LASER DRILLING
LASER RADIATION
PLASMA
PLATES
PLUMES
PULSES
SELF-ABSORPTION
SPECTROSCOPY
STEELS
SURFACE TREATMENTS
SURFACES
TIME DEPENDENCE
ABSORPTION
ALLOYS
CARBON ADDITIONS
ELECTROMAGNETIC RADIATION
IRON ALLOYS
IRON BASE ALLOYS
MACHINING
MATERIALS DRILLING
RADIATIONS
SORPTION
SPECTRA
TRANSITION ELEMENT ALLOYS