Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1990),
  • paper CWF55

Cavity enhanced photovaporization spectroscopy

Not Accessible

Your library or personal account may give you access

Abstract

Laser microcutting is used to machine precise holes and grooves by vaporizing portions of the material with a laser beam. The vaporization rate is related to the absorption coefficient and was measured as a function of the laser wavelength for various materials. The cutting process can be controlled by adjusting laser power, focal spot size, scanning speed, pulse repetition rate, and pulse length. We have developed photovaporization spectroscopy as an ultraprecise diagnostic technique in laser micromachining. With suitably chosen feedback the cavity enhanced signal could be used to adjust the cutting speed through the rate of vaporization of flat polymer, metallic, and other materials. A pulsed tunable dye laser beam is focused onto the sample placed on a motorized microposition stage inside a confocal etalon. The cutting laser beam produces a minute ablation plume by vaporizing material from the sample surface. This plume then causes optical scattering losses in the fixed frequency probe beam. At cavity resonance the transmitted probe beam intensity is a sensitive means to detect minute vaporization rates and cutting speeds. Scattering losses of <1 part in 103 can be detected. The measurement of even lower rates is possible when the accompanying photothermal effects1,2 are taken into consideration.

© 1990 Optical Society of America

PDF Article
More Like This
Photovaporization and photoradiation of intraocular malignancies

F. A. L'Esperance
WP1 Conference on Lasers and Electro-Optics (CLEO:S&I) 1983

Cavity-enhanced emission in microdroplets

A. J. Campillo, J. D. Eversole, and H.-B. Lin
FGG4 OSA Annual Meeting (FIO) 1990

Recent Developments in cavity enhanced spectroscopy

Kevin K. Lehmann and Paul Johnston
LWA3 Laser Science (LS) 2007

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved