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the axicon

Outline. What is an axicon?Its historyIts many usesOptical alignmentGeneration of diffraction free beamsCorneal surgeryOCTAtom trapsAcoustic testing

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the axicon

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    1. The Axicon Proteep Mallik OPTI 696bx 12/7/05

    3. What is an Axicon?-History Term coined by J.H. McLeod in 1954 Greek: “axis image” A point imaged onto a line segment Pinhole camera Poisson spot/Arago spot

    4. What is an Axicon?

    5. Some Applications

    6. Optical Alignment Collimated light through axicon Axicon dia = 25.4mm Depth of focus = R/[(n-1).a] ~ 29cm, for a = 50 and R = 12.7mm Diameter of ring, d = 2.l.tan [(n-1).a] Line segment width (central peak) ~ ?/R

    7. Diffraction Free Beam

    8. Corneal SurgeryQiushi Ren, Reginald Birngruber, IEEE Journal of Quantum Electronics, Vol 26, No 12, 1990 Uses negative and positive axicons to change diameter of ring for ablating corneal material Diameter of ring directly controlled by separation of axicons R = d.a.(n-1), d = axicon separation a = axicon angle R = radius of ring

    9. Optical Coherence TomographyZhihua Ding et al, Optics Letters, Vol 27, No 4, 2002

    10. Atom TrapsKi-Hwan Kim et al, Technical Digest- Intl. Quantum Electronics Conference, Vol 7, 1998

    11. Acoustic TestingC.B. Burckhardt et al, J. Acoustical Soc. Of Am., Vol 54, No 6, 1973

    12. Other Applications Solar concentrators Axicon resonators in lasers Breakdown in light filaments Gradient index, grating axicons Illumination

    13. Modeling an AxiconZEMAX Application Note Axicon defined by single parameter, ? ? = 0, plane parallel plate Surface sag, z = r.tan?, r = radial coordinates in lens units

    14. Where to Get One Altechna- Lithuania Custom orders Umicore Laser Optics, UK, sales office in USA Cone angles 179.750 to 1700, upto 50mm dia, tolerances: Sciner Optical/Del Mar Ventures Coated, uncoated, 1” dia, cone angles 179.50 to 1400, cost = $290-$350

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