Shadowgraphy and interferometry using a CW laser and a CCD of a laser-induced plasma in atmospheric air

Author

Villagrán-Muniz, Mayo ; Sobral, Hugo ; Camps, Enrique

Author_Institution

Centro de Instrum., Univ. Nacional Autonoma de Mexico, Mexico City, Mexico

Volume

29

Issue

4

fYear

2001

fDate

8/1/2001 12:00:00 AM

Firstpage

613

Lastpage

616

Abstract

We present a new application of a charged coupled device (CCD), where a continuous-wave (CW) laser is used as a probe beam in shadowgraphy and interferometric diagnosis of transparent media where the refractive index varies in time. The time resolution is obtained by gating the CCD. This configuration has the advantage that the temporal resolution of both techniques can be changed according to the evolution of the process under study and no stability setup is required, as usual, in CW interferometric techniques. We applied this method to the diagnosis of a laser induced plasma (LIP) in air measuring the evolution of plasma, shock wave, electron density, and hot core air expansion from the ns to the ms time scale

Keywords

charge-coupled devices; electron density; light interferometry; plasma density; plasma diagnostics; plasma production by laser; refractive index; CCD; CW interferometric techniques; CW laser; atmospheric air; charged coupled device; continuous-wave laser; electron density; gating; hot core air expansion; interferometric diagnosis; interferometry; laser induced plasma; laser-induced plasma; plasma evolution; probe beam; shadowgraphy; shock wave; temporal resolution; time resolution; time scales; time-resolved refractive index; transparent media; Charge coupled devices; Interferometry; Laser beams; Optical coupling; Plasma density; Plasma diagnostics; Plasma measurements; Plasma stability; Plasma waves; Probes;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.940956

Filename

940956