Abstract

Light intensity modulations caused by opaque obstacles (e.g., dust) on silica lenses in high-power lasers often enhance the potential for laser-induced damage. To study this effect, particles (10–250 µm) with various shapes were sputter deposited on the input surface and irradiated with a 3-ns laser beam at 355 nm. Although a clean silica surface damages at fluences above 15 J/cm2, a surface contaminated with particles can damage below 11.5 J/cm2. A pattern that conforms to the shape of the input surface particle is printed on the output surface. Repetitive illumination resulted in catastrophic drilling of the optic. The damage pattern correlated with an interference image of the particle before irradiation. The image shows that the incident beam undergoes phase (and amplitude) modulations after it passes around the particle. We modeled the experiments by calculating the light intensity distribution behind an obscuration by use of Fresnel diffraction theory. The comparison between calculated light intensity distribution and the output surface damage pattern showed good agreement. The model was then used to predict the increased damage vulnerability that results from intensity modulations as a function of particle size, shape, and lens thickness. The predictions provide the basis for optics cleanliness specifications on the National Ignition Facility to reduce the likelihood of optical damage.

© 2000 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Laser induced damage of fused silica polished optics due to a droplet forming organic contaminant

Karell Bien-Aimé, Jérome Néauport, Isabelle Tovena-Pecault, Evelyne Fargin, Christine Labrugère, Colette Belin, and Michel Couzi
Appl. Opt. 48(12) 2228-2235 (2009)

Characterization of laser induced damage sites in optical components

Stavros G. Demos, Mike Staggs, Kaoru Minoshima, and James Fujimoto
Opt. Express 10(25) 1444-1450 (2002)

Influence of surface cracks on laser-induced damage resistance of brittle KH2PO4 crystal

Jian Cheng, Mingjun Chen, Wei Liao, Haijun Wang, Jinghe Wang, Yong Xiao, and Mingquan Li
Opt. Express 22(23) 28740-28755 (2014)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (11)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription