Enhancement of airborne shock wave by laser-induced breakdown of liquid column in laser shock cleaning

In laser shock cleaning (LSC), the shock wave is generated by laser-induced breakdown of the ambient gas. The shock wave intensity has thus been a factor limiting the performance of the LSC process. In this work, a novel method of amplifying a laser-induced plasma-generated shock wave by the breakdo...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied physics 2011-04, Vol.109 (7), p.073101-073101-6
Main Authors: Jang, Deoksuk, Park, Jin-Goo, Kim, Dongsik
Format: Article
Language:English
Subjects:
AIR
BEAMS
BREAKDOWN
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CLEANING
ELECTROMAGNETIC RADIATION
FLUIDS
GASES
LASER RADIATION
LASERS
LIQUIDS
NEODYMIUM LASERS
PEAKS
PLASMA
PLASMA PRODUCTION
PROCESSING
RADIATIONS
SHOCK WAVES
SOLID STATE LASERS
SURFACE CLEANING
SURFACE FINISHING
SURFACES
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In laser shock cleaning (LSC), the shock wave is generated by laser-induced breakdown of the ambient gas. The shock wave intensity has thus been a factor limiting the performance of the LSC process. In this work, a novel method of amplifying a laser-induced plasma-generated shock wave by the breakdown of a liquid column is proposed and analyzed. When the laser beam is focused on a microscale liquid column, a shock wave having a significantly amplified intensity compared to that generated by air breakdown alone can be generated in air. Therefore, substantially amplified cleaning force can be obtained. The dynamics of a shock wave induced by a Q-switched Nd:YAG laser was analyzed by laser flash shadowgraphy. The peak pressure of the laser-induced shock wave was approximately two times greater than that of air breakdown at the same laser fluence. The proposed method of shock wave generation is expected to be useful in various applications of laser shock processing, including surface cleaning.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3558989