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Titolo:
Beam delivery of the Vanderbilt free electron laser with hollow wave guides: Effect on temporal and spatial pulse propagation
Autore:
Pratisto, HS; Uhlhorn, SR; Jansen, ED;
Indirizzi:
Vanderbilt Univ, Dept Biomed Engn, Nashville, TN 37235 USA Vanderbilt Univ Nashville TN USA 37235 omed Engn, Nashville, TN 37235 USA
Titolo Testata:
FIBER AND INTEGRATED OPTICS
fascicolo: 1, volume: 20, anno: 2001,
pagine: 83 - 94
SICI:
0146-8030(2001)20:1<83:BDOTVF>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Keywords:
free electron laser (FEL); hollow wave guides (HWG); beam delivery; infrared laser; medical application; pulse stretching; beam profile; mode propagation; coupling;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
--discip_EC--
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Jansen, ED Vanderbilt Univ, Dept Biomed Engn, Box 79,Stn B, Nashville, TN 37235 USA Vanderbilt Univ Box 79,Stn B Nashville TN USA 37235 N 37235 USA
Citazione:
H.S. Pratisto et al., "Beam delivery of the Vanderbilt free electron laser with hollow wave guides: Effect on temporal and spatial pulse propagation", FIBER IN OP, 20(1), 2001, pp. 83-94

Abstract

Hollow Wave Guides were evaluated as a beam delivery system for the Free Electron Laser (FEL) at Vanderbilt in preparation of surgical applications. They can transmit the mid-infrared wavelength range (2 mum - 9 mum) and tolerate the high peak intensity (>10(14) W/m(2)) in the micropulse of the FEL. Changes in the temporal and spatial beam characteristics induced by the transmission through 1.5 meter Hollow Wave Guides with bore radii of 250 mumand 530 mum were investigated Temporal broadening of the micro pulses was studied using intensity autocorrelation measurements and beam profile measurements were performed, with a pyroelectric camera. Results demonstrate significant pulse broadening and development of higher order modes induced by sub-optimal coupling of the beam into the Hollow Wave Guide. Bending of theHollow Wave Guide induced additional losses and reduced propagation of higher modes responsible for broadening the pulse. Calculations with a geometrical ray model support the findings on pulse broadening. Optimal coupling conditions are extremely critical for maximal transmission performance of the Hollow Wave Guide. Design consequences for a FEL delivery system are discussed.

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Documento generato il 02/12/20 alle ore 14:46:58