Formation of conic microstructures upon pulsed laser evaporation of solids

Journal Article · Thu Aug 31 00:00:00 EDT 2000 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2000V030N08ABEH001795· OSTI ID:21442750

Voronov, Valerii V; Dolgaev, Sergei I; Lavrishchev, S V; Lyalin, A A; Simakin, Aleksandr V; Shafeev, Georgii A ^[1]

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1. A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)

The appearance and development of large-scale self-organising microstructures on the surface of monocrystalline Si and several other materials (Ge, Ti) are studied upon their evaporation by 20-ns pulses from a copper vapour laser at 510.6 nm. The structures were formed upon repeated pulsed laser irradiation ({approx}10{sup 4} pulses with an energy density of 1-2 J cm{sup -2}) in the absence of optical breakdown of the medium above the target surface in the 1-10{sup 5} Pa pressure range in a wide range of angles of laser radiation incidence on the surface. The structures are cones with an apex angle of {approx}20-25{sup 0}, which grow towards the laser beam. It is shown that the spatial period of the structures developing during laser evaporation is determined by the period of the waves arising on the melt surface and is equal to 10-20 {mu}m. The x-ray diffraction analysis showed that the modified substrate region has a polycrystalline structure and consists of crystallites with dimensions ranging from 40 to 70 nm, depending on the pressure of the ambient atmosphere. (interaction of laser radiation with matter. laser plasma)

• OSTI ID: 21442750
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 30, Issue 8; Other Information: DOI: 10.1070/QE2000v030n08ABEH001795; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER
ENERGY DENSITY
EVAPORATION
GERMANIUM
LASER RADIATION
METAL VAPOR LASERS
MICROSTRUCTURE
PHOTON BEAMS
POLYCRYSTALS
PRESSURE RANGE
PULSES
SILICON
SOLIDS
SUBSTRATES
SURFACE TREATMENTS
SURFACES
TITANIUM
X-RAY DIFFRACTION
BEAMS
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
ELECTROMAGNETIC RADIATION
ELEMENTS
GAS LASERS
LASERS
METALS
PHASE TRANSFORMATIONS
RADIATIONS
SCATTERING
SEMIMETALS
TRANSITION ELEMENTS