NDLI: Interferometric Analysis of 1064-nm Nanosecond Laser Induced Copper Plasma

Content Provider	IEEE Xplore Digital Library
Author	Young June Hong Oh, S.Y. Sung Yong Ha Hee-Jin Kim Changhwan Lim
Copyright Year	1973
Abstract	This paper reports on the interferometric analysis of laser-induced plasma performed to investigate the spatial and temporal dynamics of a plasma column as a function of the time elapsed after laser-induced ablation on the surface of a copper target. The plasma was driven by focusing Q-switched Nd:YAG laser pulse ( λ = 1064 nm, τ = ~ 5 ns, and E=12. 5 mJ) onto a copper target and the interference patterns were constructed using a Nomarski interferometer. Phase information of the interference patterns was extracted using a fast Fourier-transform method. With the phase information obtained thus the spatial distribution of electron density was inferred from the Abel inversion equation. For the infrared nanosecond pulsed ablation regime, we observed that the resulting plasma expands preferentially toward the incoming laser beam at the early stage of plasma formation. The maximum plasma density was measured to be of the order of ~ 10²⁰ cm^-3. As time elapses, the rapid radial expansion of plasma plume and significant reduction of electron density were observed.
Sponsorship	IEEE Nuclear and Plasma Sciences Society
Starting Page	820
Ending Page	823
Page Count	4
File Size	723639
File Format	PDF
ISSN	00933813
Volume Number	42
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plasmas Free electron lasers Laser ablation Measurement by laser beam Laser beams Particle beams Optical interferometry plasma measurements Ablation interferometry
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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