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Titolo:
Preparation of fiber optics for the delivery of high-energy high-beam-quality Nd : YAG laser pulses
Autore:
Kuhn, A; French, P; Hand, DP; Blewett, IJ; Richmond, M; Jones, JDC;
Indirizzi:
Heriot Watt Univ, Dept Phys, Edinburgh EH14 4AS, Midlothian, Scotland Heriot Watt Univ Edinburgh Midlothian Scotland EH14 4AS lothian, Scotland Univ Liverpool, Dept Mech Engn, Liverpool L68 3BX, Merseyside, England Univ Liverpool Liverpool Merseyside England L68 3BX , Merseyside, England GSI Lumon Ltd, Rugby CV21 1QN, Warwick, England GSI Lumon Ltd Rugby Warwick England CV21 1QN y CV21 1QN, Warwick, England
Titolo Testata:
APPLIED OPTICS
fascicolo: 33, volume: 39, anno: 2000,
pagine: 6136 - 6143
SICI:
0003-6935(20001120)39:33<6136:POFOFT>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
FUSED-SILICA SURFACES; DAMAGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Kuhn, A Heriot Watt Univ, Dept Phys, Edinburgh EH14 4AS, Midlothian, Scotland Heriot Watt Univ Edinburgh Midlothian Scotland EH14 4AS Scotland
Citazione:
A. Kuhn et al., "Preparation of fiber optics for the delivery of high-energy high-beam-quality Nd : YAG laser pulses", APPL OPTICS, 39(33), 2000, pp. 6136-6143

Abstract

Recent improvements in design have made it possible to build Nd:YAG laserswith both high pulse energy and high beam quality. These lasers are particularly suited for percussion drilling of holes of as much as l-mm diameter thick (a few millimeters) metal parts. An example application is the production of cooling holes in aeroengine components for which 1-ms duration, 30-J energy laser pulses produce holes of sufficient quality much more efficiently than with a laser trepanning process. Fiber optic delivery of the laser beam would be advantageous, particularly when one is processing complex three-dimensional structures. However, lasers for percussion drilling are available only with conventional bulk-optic beam delivery because of laser-induced damage problems with the small-diameter (approximately 200-400-mum) fibers that would be required for preserving necessary beam quality. We report measurements of beam degradation in step-index optical fibers with an input beam quality corresponding to an M-2 of 22. We then show that the laser-induced damage threshold of 400-mum core-diameter optical fibers can be increased significantly by a CO2 laser treatment step following the mechanical polishing routine. This increase in laser-induced damage threshold is sufficient to propagate 25-J, 1-ms laser pulses with a 400-mum core-diameter optical fiber and an output M-2 of 31. (C) 2000 Optical Society of America OCIS codes: 060.2270, 060.2300, 060-2310, 060.2400, 140.3390, 140.3530.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/04/20 alle ore 07:42:43