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Updated: Mar 8, 2026
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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
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Energetic material response to ultrafast indirect laser heating.
Applied Optics
|February 4, 2017
Summary
This study reveals how heat transfer initiates explosives. Adding oxidized polyethylene to cyclotrimethylene trinitramine affects its electronic structure and heat transfer rates, impacting initiation sensitivity.
Area of Science:
- Materials Science
- Physical Chemistry
- Chemical Engineering
Background:
- Understanding thermal energy transfer is crucial for explosives initiation.
- Femtosecond laser heating offers precise control over energy deposition.
- The role of additives in modifying explosive properties requires detailed investigation.
Purpose of the Study:
- To investigate the initial thermal energy transfer into solid explosives.
- To elucidate the role of temperature in shock-induced initiation.
- To study the effect of oxidized polyethylene (OPE) on cyclotrimethylene trinitramine (RDX) properties.
Main Methods:
- Indirect femtosecond laser heating technique.
- Picosecond timescale measurements.
- Time-resolved visible transient absorption (TA) spectroscopy (500-750 nm).
Main Results:
- Transient absorption (TA) was observed in RDX and RDX with OPE, but not in pure OPE.
- Increasing OPE content in RDX decreased TA intensity and increased signal observation time.
- Femtosecond laser pulses (15 mJ/cm²) induced electronic structure changes in RDX.
Conclusions:
- Thermal energy from femtosecond laser pulses can excite RDX molecules.
- Heat transfer rate in RDX is influenced by homogeneity and purity.
- OPE addition modulates the thermal response and initiation characteristics of RDX.
