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Title: Mechanisms of formation of sub- and micrometre-scale holes in thin metal films by single nano- and femtosecond laser pulses

Mechanisms of formation of sub- and micrometre-scale holes in thin silver and chromium films of variable thickness by tightly-focused single nanosecond IR laser pulses with fluences in the range of 10 – 10{sup 4} J cm{sup -2} are studied by means of optical and scanning electron microscopy. At the minimal fluences above 5 J cm{sup -2}, the micrometre (2 – 5 μm in radius) holes are produced in these films, accompanying the lateral heat conduction in the film during the pump laser pulse, cavitation at the metallic/glass interface and subsequent explosive removal of the molten film. At the fluences of ∼1 – 10 kJ cm{sup -2} much larger (20 – 40 μm in radius) holes are formed in the film as a result of its heating by the erosive surface microplasma through the lateral heat conduction in the film during the plasma lifetime of the order of a few microseconds. Finally, at the maximal fluences (well above 10 kJ cm{sup -2}), the submillimetre holes were produced in these films by intense shock waves, generated in the erosive microplasmas. The comparative analysis of the formation mechanisms for sub- and micrometrescale holes in the same thin metal films by the single nano-more » and femtosecond laser pulses is provided. (extreme light fields and their applications)« less
Authors:
; ; ; ; ; ;  [1] ; ; ;  [2] ; ;  [3]
  1. P N Lebedev Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
  2. Institute for Automation and Control Processes, Far-Eastern Branch, Russian Academy of Sciences, Vladivostok (Russian Federation)
  3. N.E. Bauman Moscow State Technical University, Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
22395857
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 44; Journal Issue: 6; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHROMIUM; HOLES; LASERS; PULSES; SCANNING ELECTRON MICROSCOPY; SILVER; SOLID-STATE PLASMA; THERMAL CONDUCTION; THIN FILMS