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  Digital interference microscopy and density reconstruction of picosecond infrared laser desorption at the water-air interface

Busse, F., Kruber, S., Robertson, W., & Miller, R. J. D. (2018). Digital interference microscopy and density reconstruction of picosecond infrared laser desorption at the water-air interface. Journal of Applied Physics, 124(9): 094701. doi:10.1063/1.5030741.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-135D-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-135E-0
Genre: Journal Article

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https://dx.doi.org/10.1063/1.5030741 (Publisher version)
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 Creators:
Busse, Frederik1, 2, 3, Author              
Kruber, S.1, 2, 3, Author              
Robertson, W.1, 2, Author              
Miller, R. J. D.1, 2, 4, Author              
Affiliations:
1Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              
2Centre for Ultrafast Imaging, ou_persistent22              
3Department of Physics, University of Hamburg, ou_persistent22              
4Departments of Chemistry and Physics, University of Toronto, ou_persistent22              

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 Abstract: Material ablation and evaporation using pulsed infrared lasers pose promising approaches for matrix-free laser desorption ionization and in laser surgery. For the best results, key parameters such as laser wavelength, pulse duration, and pulse energy need to be carefully adjusted to the application. We characterize the dynamics at the water-air interface induced by a 10 ps infrared laser tuned to the water absorption band at 3  μm, a parameter set facilitating stress confined desorption for typical absorption depths in biological samples and tissue. By driving the ablation faster than nucleation growth, cavitation induced sample damage during the ablation process can be mitigated. The resultant explosive ablation process leads to a shock front expansion and material ejection which we capture using off-axis digital interference microscopy, an interference technique particularly useful for detecting the phase shift caused by transparent objects. It is demonstrated that the method can yield local density information of the observed shock front with a single image acquisition as compared to the usually performed fit of the velocity extracted from several consecutive snapshots. We determine the ablation threshold to be (0.5±0.2) J cm−2 and observe a significant distortion of the central parts of the primary shock wave above approximately 2.5  J cm−2. The differences in plume shape observed for higher fluences are reflected in an analysis based on shock wave theory, which shows a very fast initial expansion.

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Language(s): eng - English
 Dates: 2018-03-252018-07-242018-09-062018-09-07
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1063/1.5030741
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Title: Journal of Applied Physics
  Abbreviation : J. Appl. Phys.
Source Genre: Journal
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Publ. Info: New York, NY : AIP Publishing
Pages: - Volume / Issue: 124 (9) Sequence Number: 094701 Start / End Page: - Identifier: ISSN: 0021-8979
CoNE: /journals/resource/991042723401880