We present a quantitative shadowgraphic method that can measure the density of a laser-generated plasma in air. Simultaneous comparison of both shadowgraphy and interferometry has been carried out, allowing the experimental evaluation of the reliability of the shadowgraphic method. Even though limited by absorption in the sample, shadowgraphy performs better in terms of sensitivity.
© 2007 Optical Society of America
Instrumentation, Measurement, and Metrology
Original Manuscript: November 3, 2006
Revised Manuscript: February 9, 2007
Manuscript Accepted: February 13, 2007
Published: April 17, 2007
Amrutha Gopal, Stefano Minardi, and Michael Tatarakis, "Quantitative two-dimensional shadowgraphic method for high-sensitivity density measurement of under-critical laser plasmas," Opt. Lett. 32, 1238-1240 (2007)