Outline for OPTI 696D at UA
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Date Created: 02/06/15
l l The Axicon Proteep Mallik OPTI 696bx 12705 College of Optical Sciences Tm UNIVERSITY OF ARIZONA Outline I What is an axicon El Its history I Its many uses a Optical alignment Generation of diffraction free beams Corneal surgery 1 OCT Atom traps Ll Acoustictesting the list is endless I Modeling an axicon ZEMAX I Where to get one 113 College of Optical Sciences K 3 THE UNJVERSITY or ARLZONA l What is an Axicon History I Term coined by JH McLoed in 1954 I Greek axis image I A point imaged onto a line segment i Pinhole camera l i Poisson spotArago spot College of Optical Sciences Tun UNJVERSITY or ARIZONA quot J l oMany definitions Conical lens or rotationally symmetric prism Cone angle 1800 20 Produces a line focus oProjects a ring spot College of Optical Sciences Tim UNWL Rsm OF ARIZONA Optical Alignment Collimated light through axicon Axicon clia 254mm Depth of focus Rn1or 290m for or 50 and R 127mm Diameter of ring cl 2tan n1or Line segment width central peak AR Jul2 BEAM FORMATION ZONE AFEHTUHE WAVEGUIDE co LASER BEAM EXPANDER COLLIMATOR AXICON RANGE Z College of Optical Sciences IMAGING LENS Tm UNIVLRSI39I39Y or AHLZUNA Diffraction Free Beam rradiance behind axicon given by k is 398 Jo rkr sin 3 IOquot COS Pigtail Style Collimator where r radial coordinate on obsenation plane do is a zero order Bessel function Axicon Lens E is the energy ofthe beam at RZ JO is a function of transverse coordinates Remains unchanged for 2 lt L Used where long interaction lengths are needed atom traps Compton scattering etc College of Optical Sciences Tun UNWERSITY or ARIZONA 39 Corneal Surgery Qiushi Ren Reginald Birngruber IEEE Journal of Quantum Electronics Vol 26 No 12 1990 I Uses negative and positive axicons to change diameter of ring for ablating corneal material I Diameter of ring directly controlled by separation of axicons I R dorn1 d axicon separation or axicon angle R radius of ring FIclulfnt d ltlt f focal length of lens College of Optical Sciences Tm UNlVLRSl39I39Y or ARIZONA Optical Coherence Tomography Zhihua Ding et al Optics Letters Vol 27 No 4 2002 Focus depth increased wrt conventional lens Better than 10pm lateral resolution over 6mm axial position Normalized Intensity Comparable Gaussian beam has axial range of only 025mm Disadvantage less light at focus point College of Optical Sciences Tim UNWL ksm39 or ARIZONA Conventional Lens l 7 9 10 Axial Position mm ijcon Lens Atom Traps KiHwan Kim et al Technical Digest lntl Quantum Electronics Conference Vol 7 1998 photo diode m Axicon mirror with hole in the middle 0 can C AM ERA Pushing beam pushes atoms towards hole collimated beam J Turning counterpropagating beam onoff Home BEAM Counterpropagating beam through hole pushing beam collimation Creates pulsed atom beam through hole probe College of Optical Sciences Tun UNJVL Rsm39 OF ARIZONA f Acoustic Testing 08 Burckhardt et al J Acoustical Soc Of Am Vol 54 No 6 1973 Transducer creates ultrasonic beam Focused by plexiglass lens incident on a conical mirror Divergent beam incident on large axicon cone sphere Axicon focuses acoustic beam over a large range Test material defects so INTER OF CURVATURE ULTRASOUND TRANSDUCER FOCAL LINE Q cm m College of Optical Sciences mcm Tun UNJVERSITY or ARIZONA 39 Other Applications I Solar concentrators I Axicon resonators in lasers I Breakdown in light filaments I Gradient index grating axicons I Illumination College of Optical Sciengkegm 2 nu UNivL Rsm39 or Modeling an Axicon ZEMAX Application Note I Axicon defined by single parameter 6 I G 0 plane parallel plate I Surface sag z rtan6 r radial coordinates in lens units 5 Standard Surface Model Odd Asphere Surface Model Iset roc to small value several times ISet roc infinity param1 tane smaller than smallest radial aperture conic lt 1 IEx axicon dia 100mm cone angle IOther nonsequential ways to 10 use conic 3316 roc 1mm or model less but not zero College of Optical Sciences Tm UNIVLRSII Y or ARLZUNA Where to Get One I Altechna Lithuania L Custom orders I Umicore Laser Optics UK sales office in USA M Cone angles 179750 to 1700 upto 50mm dia tolerances Diameter 00 1111111 Thickness i 02111111 ETV G lt 10 lt002111111 9 Zi 1 lt005111111 I Sciner OpticalDel Mar Ventures Coated uncoated 1 dia cone angles 17950 to 1400 cost 290350 College of Optical Sciences Tun UNWERSITY or ARIZONA
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