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Plasma plume expansion dynamics in nanosecond Nd:YAG laserosteotome

Abbasi, Hamed and Rauter, Georg and Guzman, Raphael and Cattin, Philippe C. and Zam, Azhar. (2018) Plasma plume expansion dynamics in nanosecond Nd:YAG laserosteotome. In: Proceedings of SPIE, 10505. p. 1050513.

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Official URL: https://edoc.unibas.ch/65177/

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Abstract

In minimal invasive laser osteotomy precise information about the ablation process can be obtained with LIBS in order to avoid carbonization, or cutting of wrong types of tissue. Therefore, the collecting fiber for LIBS needs to be optimally placed in narrow cavities in the endoscope. To determine this optimal placement, the plasma plume expansion dynamics in ablation of bone tissue by the second harmonic of a nanosecond Nd:YAG laser at 532 nm has been studied. The laserinduced plasma plume was monitored in different time delays, from one nanosecond up to one hundred microseconds. Measurements were performed using high-speed gated illumination imaging. The expansion features were studied using illumination of the overall visible emission by using a gated intensified charged coupled device (ICCD). The camera was capable of having a minimum gate width (Optical FWHM) of 3 ns and the timing resolution (minimum temporal shift of the gate) of 10 ps. The imaging data were used to generate position-time data of the luminous plasma-front. Moreover, the velocity of the plasma plume expansion was studied based on the time-resolved intensity data. By knowing the plasma plume profile over time, the optimum position (axial distance from the laser spot) of the collecting fiber and optimal time delay (to have the best signal to noise ratio) in spatial-resolved and time-resolved laser-induced breakdown spectroscopy (LIBS) can be determined. Additionally, the function of plasma plume expansion could be used to study the shock wave of the plasma plume.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedical Engineering
03 Faculty of Medicine > Departement Biomedical Engineering > Imaging and Computational Modelling > Center for medical Image Analysis & Navigation (Cattin)
03 Faculty of Medicine > Departement Biomedical Engineering > Laser and Robotics > Bio-Inspired Robots for Medicine-Lab (Rauter)
03 Faculty of Medicine > Departement Biomedical Engineering > Laser and Robotics > Biomedical Laser and Optics (Zam)
UniBasel Contributors:Abbasi, Hamed and Rauter, Georg and Guzman, Raphael and Cattin, Philippe Claude and Zam, Azhar
Item Type:Conference or Workshop Item, refereed
Conference or workshop item Subtype:Conference Paper
Publisher:International Society for Optics and Photonics (SPIE)
Series Name:SPIE Photonics West (BiOS), High-Speed Biomedical Imaging and Spectroscopy III: Toward Big Data Instrumentation and Management
ISSN:0277-786X
Note:Publication type according to Uni Basel Research Database: Conference paper
Language:English
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Last Modified:25 Mar 2019 13:09
Deposited On:15 Oct 2018 09:42

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