Recent advances in laser ablation modelling for asteroid deflection methods

Nicolas Thiry, Massimiliano Vasile

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review

10 Citations (Scopus)


Over the past few years, a series of studies have demonstrated the theoretical benefits of using laser ablation in order to mitigate the threat of a potential asteroid on a collision course with earth. Compared to other slow-push mitigation strategies, laser ablation allows for a significant reduction in fuel consumption since the ablated material is used as propellant. A precise modelling of the ablation process is however difficult due to the high variability in the physical parameters encountered among the different asteroids as well as the scarcity of experimental studies available in the literature. In this paper, we derive a new thermal model to simulate the efficiency of a laser-based detector. The useful material properties are first derived from thermochemical tables and equilibrium thermodynamic considerations. These properties are then injected in a 3D axisymetrical thermal model developed in Matlab. A temperature-dependent conduction flux is imposed on the exterior boundary condition that takes into account the balance between the incident power and the power losses due to the vaporization process across the Knudsen layer and the radiations respectively. A non-linear solver is finally used and the solution integrated over the ablation front to reconstruct the net thrust and the global mass flow. Compared to an initial 1D model, this new approach shows the importance of the parietal radiation losses in the case of a CW laser. Despite the low energy conversion efficiency, this new model still demonstrates the theoretical benefit of using lasers over more conventional low-thrust strategies.
Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Subtitle of host publicationNanophotonics, Macrophotonics for Space Environments VIII
EditorsEdward W. Taylor, David A. Cardimona
Place of PublicationSan Diego, California
Publication statusPublished - 17 Sept 2014
Event8th Nanophotonics and Macrophotonics for Space Environment Conference, NMSE 2014 - San Diego, United Kingdom
Duration: 18 Aug 201419 Aug 2014


Conference8th Nanophotonics and Macrophotonics for Space Environment Conference, NMSE 2014
Country/TerritoryUnited Kingdom
CitySan Diego


  • laser ablation
  • asteroid deflection
  • thermal model


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