期刊
LASER AND PARTICLE BEAMS
卷 28, 期 3, 页码 393-397出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0263034610000376
关键词
Laser-produced plasma; Micro-radiography
资金
- RFBR [09-02-92482-MNKS-a, 10-02-91174-GFEN a, 10-02-000345 a]
- CRDF BRHE [Y5-P-11-02]
- Presidium RAS [12, 27]
- FCP [02.740.11.0236]
- MEXT, Japan [20244065]
K-shell emission from copper target was observed by focusing femtosecond laser pulses very close to the target surface-air interface. It was shown that mechanism of X-ray emission is connected with generation of fast electrons in the air plasma area. Experiments demonstrated that moderate intensity of laser radiation (I(L) < 10(15) W/cm(2)) was enough to produce considerable flux of X-ray photons of at least 10 keV energy. The parameters of generated X-ray emission were studied. It was found that after propagation through 40 cm thick air layer X-ray spectra consisted of pronounced K(a) and K(beta) characteristic lines and relatively small Bremsstrahlung continuum. Since transversal source size has an order of a few tens of micrometers, such a source can be used for absorption imaging of micro-objects in standard laboratory conditions. That can be particularly important for diagnostic of medical and biological samples in vivo.
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