Abstract

As a proof of concept, we experimentally demonstrate multiplexing of free-space optical signals in multiple channels labeled with different states of orbital angular momentum. The multiplexing process is carried out by a dynamic liquid-crystal spatial light modulator, while the phase function is calculated by an iterative algorithm. A binary amplitude computer-generated hologram serves as a demultiplexer.

© 2007 Optical Society of America

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  1. H. He, M. Friese, N. Heckenberg, and H. Rubinsztein-Dunlop, "Direct observation of transfer of angular momentum to absorptive particles from a laser beam with a phase singularity," Phys. Rev. Lett. 75, 826-829 (1995).
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    [Crossref] [PubMed]
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    [Crossref]
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    [Crossref] [PubMed]
  5. J. Curtis and D. Grier, "Structure of optical vortices," Phys. Rev. Lett. 90, 133901 (2003).
    [Crossref] [PubMed]
  6. J. Lin, X.-C. Yuan, S. H. Tao, X. Peng, and H. B. Niu, "Deterministic approach to the generation of modified helical beams for optical manipulation," Opt. Express 13, 3862-3867 (2005).
    [Crossref] [PubMed]
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    [Crossref] [PubMed]
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    [Crossref]
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    [Crossref] [PubMed]
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    [Crossref] [PubMed]
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    [Crossref]
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    [Crossref]
  16. S. N. Khonina, V. V. Kotlyar, V. A. Soifer, K. Jefimovs, and J. Turunen, "Generation and selection of laser beams represented by a superposition of two angular harmonics," J. Mod. Opt. 51, 761-773 (2004).
    [Crossref]
  17. A. Jesacher, S. Furhapter, S. Bernet, and M. Ritsch-Marte, "Size selective trapping with optical 'cogwheel' tweezers," Opt. Express 12, 4129-4135 (2004).
    [Crossref] [PubMed]
  18. Z. Bouchal and R. Celechovsky, "Mixed vortex states of light as information carriers," New J. Phys. 6, 131 (2004).
    [Crossref]
  19. R. Celechovsky and Z. Bouchal, "Generation of variable mixed vortex fields by a single static hologram," J. Mod. Opt. 53, 473-480 (2006).
    [Crossref]
  20. N. R. Heckenberg, R. McDuff, C. P. Smith, H. Rubinsztein-Dunlop, and M. J. Wegener, "Laser beams with phase singularities," Opt. Quantum Electron. 24, S951-S962 (1992).
    [Crossref]
  21. G. Gibson II, J. Courtial, M. Vasnetsov, S. Barnett, S. Franke-Arnold, and M. Padgett, "Increasing the data density of free-space optical communications using orbital angular momentum," Proc. SPIE 5550, 367-373 (2004).
    [Crossref]
  22. Z. Bouchal, O. Haderka, and R. Celechovsky, "Selective excitation of vortex fiber modes using a spatial light modulator," New J. Phys. 7, 125 (2005).
    [Crossref]

2006 (2)

J. Lin, X.-C. Yuan, S. H. Tao, and R. E. Burge, "Synthesis of multiple collinear helical modes generated by a phase-only element," J. Opt. Soc. Am. A 23, 1214-1218 (2006).
[Crossref]

R. Celechovsky and Z. Bouchal, "Generation of variable mixed vortex fields by a single static hologram," J. Mod. Opt. 53, 473-480 (2006).
[Crossref]

2005 (3)

2004 (5)

G. Gibson, J. Courtial, M. J. Padgett, M. Vasnetsov, V. Pas'ko, S. M. Barnett, and S. Franke-Arnold, "Free-space information transfer using light beams carrying orbital angular momentum," Opt. Express 12, 5448-5456 (2004).
[Crossref] [PubMed]

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, K. Jefimovs, and J. Turunen, "Generation and selection of laser beams represented by a superposition of two angular harmonics," J. Mod. Opt. 51, 761-773 (2004).
[Crossref]

A. Jesacher, S. Furhapter, S. Bernet, and M. Ritsch-Marte, "Size selective trapping with optical 'cogwheel' tweezers," Opt. Express 12, 4129-4135 (2004).
[Crossref] [PubMed]

Z. Bouchal and R. Celechovsky, "Mixed vortex states of light as information carriers," New J. Phys. 6, 131 (2004).
[Crossref]

G. Gibson II, J. Courtial, M. Vasnetsov, S. Barnett, S. Franke-Arnold, and M. Padgett, "Increasing the data density of free-space optical communications using orbital angular momentum," Proc. SPIE 5550, 367-373 (2004).
[Crossref]

2003 (1)

J. Curtis and D. Grier, "Structure of optical vortices," Phys. Rev. Lett. 90, 133901 (2003).
[Crossref] [PubMed]

2002 (1)

A. T. O'Neil, I. MacVicar, L. Allen, and M. J. Padgett, "Intrinsic and extrinsic nature of the orbital angular momentum of a light beam," Phys. Rev. Lett. 88, 053601 (2002).
[Crossref] [PubMed]

2001 (3)

G. Molina-Terriza, J. P. Torres, and L. Torner, "Management of the angular momentum of light: preparation of photons in multidimensional vector states of angular momentum," Phys. Rev. Lett. 88, 013601 (2001).
[Crossref]

A. Mair, A. Vaziri, G. Weihs, and A. Zeilinger, "Entanglement of the orbital angular momentum states of photons," Nature 412, 313-316 (2001).
[Crossref] [PubMed]

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, P. Paakkonen, J. Simonen, and J. Turunen, "An analysis of the angular momentum of a light field in terms of angular harmonics," J. Mod. Opt. 48, 1543-1557 (2001).
[Crossref]

1999 (1)

1996 (1)

1995 (1)

H. He, M. Friese, N. Heckenberg, and H. Rubinsztein-Dunlop, "Direct observation of transfer of angular momentum to absorptive particles from a laser beam with a phase singularity," Phys. Rev. Lett. 75, 826-829 (1995).
[Crossref] [PubMed]

1994 (1)

M. W. Beijersbergen, R. P. C. Coerwinkel, M. Kristensen, and J. P. Woerdman, "Helical-wavefront laser beams produced with a spiral phaseplate," Opt. Commun. 112, 321-327 (1994).
[Crossref]

1992 (2)

L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw, and J. P. Woerdman, "Orbital angular-momentum of light and the transformation of Laguerre-Gaussian laser modes," Phys. Rev. A 45, 8185-8189 (1992).
[Crossref] [PubMed]

N. R. Heckenberg, R. McDuff, C. P. Smith, H. Rubinsztein-Dunlop, and M. J. Wegener, "Laser beams with phase singularities," Opt. Quantum Electron. 24, S951-S962 (1992).
[Crossref]

1982 (1)

Allen, L.

A. T. O'Neil, I. MacVicar, L. Allen, and M. J. Padgett, "Intrinsic and extrinsic nature of the orbital angular momentum of a light beam," Phys. Rev. Lett. 88, 053601 (2002).
[Crossref] [PubMed]

L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw, and J. P. Woerdman, "Orbital angular-momentum of light and the transformation of Laguerre-Gaussian laser modes," Phys. Rev. A 45, 8185-8189 (1992).
[Crossref] [PubMed]

April, G.

Arsenault, H. H.

Barnett, S.

G. Gibson II, J. Courtial, M. Vasnetsov, S. Barnett, S. Franke-Arnold, and M. Padgett, "Increasing the data density of free-space optical communications using orbital angular momentum," Proc. SPIE 5550, 367-373 (2004).
[Crossref]

Barnett, S. M.

Beijersbergen, M. W.

M. W. Beijersbergen, R. P. C. Coerwinkel, M. Kristensen, and J. P. Woerdman, "Helical-wavefront laser beams produced with a spiral phaseplate," Opt. Commun. 112, 321-327 (1994).
[Crossref]

L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw, and J. P. Woerdman, "Orbital angular-momentum of light and the transformation of Laguerre-Gaussian laser modes," Phys. Rev. A 45, 8185-8189 (1992).
[Crossref] [PubMed]

Bernet, S.

Bouchal, Z.

R. Celechovsky and Z. Bouchal, "Generation of variable mixed vortex fields by a single static hologram," J. Mod. Opt. 53, 473-480 (2006).
[Crossref]

Z. Bouchal, O. Haderka, and R. Celechovsky, "Selective excitation of vortex fiber modes using a spatial light modulator," New J. Phys. 7, 125 (2005).
[Crossref]

Z. Bouchal and R. Celechovsky, "Mixed vortex states of light as information carriers," New J. Phys. 6, 131 (2004).
[Crossref]

Burge, R. E.

Celechovsky, R.

R. Celechovsky and Z. Bouchal, "Generation of variable mixed vortex fields by a single static hologram," J. Mod. Opt. 53, 473-480 (2006).
[Crossref]

Z. Bouchal, O. Haderka, and R. Celechovsky, "Selective excitation of vortex fiber modes using a spatial light modulator," New J. Phys. 7, 125 (2005).
[Crossref]

Z. Bouchal and R. Celechovsky, "Mixed vortex states of light as information carriers," New J. Phys. 6, 131 (2004).
[Crossref]

Coerwinkel, R. P. C.

M. W. Beijersbergen, R. P. C. Coerwinkel, M. Kristensen, and J. P. Woerdman, "Helical-wavefront laser beams produced with a spiral phaseplate," Opt. Commun. 112, 321-327 (1994).
[Crossref]

Courtial, J.

G. Gibson II, J. Courtial, M. Vasnetsov, S. Barnett, S. Franke-Arnold, and M. Padgett, "Increasing the data density of free-space optical communications using orbital angular momentum," Proc. SPIE 5550, 367-373 (2004).
[Crossref]

G. Gibson, J. Courtial, M. J. Padgett, M. Vasnetsov, V. Pas'ko, S. M. Barnett, and S. Franke-Arnold, "Free-space information transfer using light beams carrying orbital angular momentum," Opt. Express 12, 5448-5456 (2004).
[Crossref] [PubMed]

Curtis, J.

J. Curtis and D. Grier, "Structure of optical vortices," Phys. Rev. Lett. 90, 133901 (2003).
[Crossref] [PubMed]

Franke-Arnold, S.

G. Gibson II, J. Courtial, M. Vasnetsov, S. Barnett, S. Franke-Arnold, and M. Padgett, "Increasing the data density of free-space optical communications using orbital angular momentum," Proc. SPIE 5550, 367-373 (2004).
[Crossref]

G. Gibson, J. Courtial, M. J. Padgett, M. Vasnetsov, V. Pas'ko, S. M. Barnett, and S. Franke-Arnold, "Free-space information transfer using light beams carrying orbital angular momentum," Opt. Express 12, 5448-5456 (2004).
[Crossref] [PubMed]

Friese, M.

H. He, M. Friese, N. Heckenberg, and H. Rubinsztein-Dunlop, "Direct observation of transfer of angular momentum to absorptive particles from a laser beam with a phase singularity," Phys. Rev. Lett. 75, 826-829 (1995).
[Crossref] [PubMed]

Furhapter, S.

Gahagan, K.

Gibson, G.

G. Gibson, J. Courtial, M. J. Padgett, M. Vasnetsov, V. Pas'ko, S. M. Barnett, and S. Franke-Arnold, "Free-space information transfer using light beams carrying orbital angular momentum," Opt. Express 12, 5448-5456 (2004).
[Crossref] [PubMed]

G. Gibson II, J. Courtial, M. Vasnetsov, S. Barnett, S. Franke-Arnold, and M. Padgett, "Increasing the data density of free-space optical communications using orbital angular momentum," Proc. SPIE 5550, 367-373 (2004).
[Crossref]

Grier, D.

J. Curtis and D. Grier, "Structure of optical vortices," Phys. Rev. Lett. 90, 133901 (2003).
[Crossref] [PubMed]

Haderka, O.

Z. Bouchal, O. Haderka, and R. Celechovsky, "Selective excitation of vortex fiber modes using a spatial light modulator," New J. Phys. 7, 125 (2005).
[Crossref]

He, H.

H. He, M. Friese, N. Heckenberg, and H. Rubinsztein-Dunlop, "Direct observation of transfer of angular momentum to absorptive particles from a laser beam with a phase singularity," Phys. Rev. Lett. 75, 826-829 (1995).
[Crossref] [PubMed]

Heckenberg, N.

H. He, M. Friese, N. Heckenberg, and H. Rubinsztein-Dunlop, "Direct observation of transfer of angular momentum to absorptive particles from a laser beam with a phase singularity," Phys. Rev. Lett. 75, 826-829 (1995).
[Crossref] [PubMed]

Heckenberg, N. R.

N. R. Heckenberg, R. McDuff, C. P. Smith, H. Rubinsztein-Dunlop, and M. J. Wegener, "Laser beams with phase singularities," Opt. Quantum Electron. 24, S951-S962 (1992).
[Crossref]

Hsu, Y.

Jefimovs, K.

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, K. Jefimovs, and J. Turunen, "Generation and selection of laser beams represented by a superposition of two angular harmonics," J. Mod. Opt. 51, 761-773 (2004).
[Crossref]

Jesacher, A.

Khonina, S. N.

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, K. Jefimovs, and J. Turunen, "Generation and selection of laser beams represented by a superposition of two angular harmonics," J. Mod. Opt. 51, 761-773 (2004).
[Crossref]

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, P. Paakkonen, J. Simonen, and J. Turunen, "An analysis of the angular momentum of a light field in terms of angular harmonics," J. Mod. Opt. 48, 1543-1557 (2001).
[Crossref]

Kotlyar, V. V.

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, K. Jefimovs, and J. Turunen, "Generation and selection of laser beams represented by a superposition of two angular harmonics," J. Mod. Opt. 51, 761-773 (2004).
[Crossref]

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, P. Paakkonen, J. Simonen, and J. Turunen, "An analysis of the angular momentum of a light field in terms of angular harmonics," J. Mod. Opt. 48, 1543-1557 (2001).
[Crossref]

Kristensen, M.

M. W. Beijersbergen, R. P. C. Coerwinkel, M. Kristensen, and J. P. Woerdman, "Helical-wavefront laser beams produced with a spiral phaseplate," Opt. Commun. 112, 321-327 (1994).
[Crossref]

Lin, J.

MacVicar, I.

A. T. O'Neil, I. MacVicar, L. Allen, and M. J. Padgett, "Intrinsic and extrinsic nature of the orbital angular momentum of a light beam," Phys. Rev. Lett. 88, 053601 (2002).
[Crossref] [PubMed]

Mair, A.

A. Mair, A. Vaziri, G. Weihs, and A. Zeilinger, "Entanglement of the orbital angular momentum states of photons," Nature 412, 313-316 (2001).
[Crossref] [PubMed]

McDuff, R.

N. R. Heckenberg, R. McDuff, C. P. Smith, H. Rubinsztein-Dunlop, and M. J. Wegener, "Laser beams with phase singularities," Opt. Quantum Electron. 24, S951-S962 (1992).
[Crossref]

Molina-Terriza, G.

G. Molina-Terriza, J. P. Torres, and L. Torner, "Management of the angular momentum of light: preparation of photons in multidimensional vector states of angular momentum," Phys. Rev. Lett. 88, 013601 (2001).
[Crossref]

Niu, H. B.

O'Neil, A. T.

A. T. O'Neil, I. MacVicar, L. Allen, and M. J. Padgett, "Intrinsic and extrinsic nature of the orbital angular momentum of a light beam," Phys. Rev. Lett. 88, 053601 (2002).
[Crossref] [PubMed]

Paakkonen, P.

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, P. Paakkonen, J. Simonen, and J. Turunen, "An analysis of the angular momentum of a light field in terms of angular harmonics," J. Mod. Opt. 48, 1543-1557 (2001).
[Crossref]

Padgett, M.

G. Gibson II, J. Courtial, M. Vasnetsov, S. Barnett, S. Franke-Arnold, and M. Padgett, "Increasing the data density of free-space optical communications using orbital angular momentum," Proc. SPIE 5550, 367-373 (2004).
[Crossref]

Padgett, M. J.

G. Gibson, J. Courtial, M. J. Padgett, M. Vasnetsov, V. Pas'ko, S. M. Barnett, and S. Franke-Arnold, "Free-space information transfer using light beams carrying orbital angular momentum," Opt. Express 12, 5448-5456 (2004).
[Crossref] [PubMed]

A. T. O'Neil, I. MacVicar, L. Allen, and M. J. Padgett, "Intrinsic and extrinsic nature of the orbital angular momentum of a light beam," Phys. Rev. Lett. 88, 053601 (2002).
[Crossref] [PubMed]

Pas'ko, V.

Peng, X.

Ritsch-Marte, M.

Rubinsztein-Dunlop, H.

H. He, M. Friese, N. Heckenberg, and H. Rubinsztein-Dunlop, "Direct observation of transfer of angular momentum to absorptive particles from a laser beam with a phase singularity," Phys. Rev. Lett. 75, 826-829 (1995).
[Crossref] [PubMed]

N. R. Heckenberg, R. McDuff, C. P. Smith, H. Rubinsztein-Dunlop, and M. J. Wegener, "Laser beams with phase singularities," Opt. Quantum Electron. 24, S951-S962 (1992).
[Crossref]

Simonen, J.

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, P. Paakkonen, J. Simonen, and J. Turunen, "An analysis of the angular momentum of a light field in terms of angular harmonics," J. Mod. Opt. 48, 1543-1557 (2001).
[Crossref]

Smith, C. P.

N. R. Heckenberg, R. McDuff, C. P. Smith, H. Rubinsztein-Dunlop, and M. J. Wegener, "Laser beams with phase singularities," Opt. Quantum Electron. 24, S951-S962 (1992).
[Crossref]

Soifer, V. A.

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, K. Jefimovs, and J. Turunen, "Generation and selection of laser beams represented by a superposition of two angular harmonics," J. Mod. Opt. 51, 761-773 (2004).
[Crossref]

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, P. Paakkonen, J. Simonen, and J. Turunen, "An analysis of the angular momentum of a light field in terms of angular harmonics," J. Mod. Opt. 48, 1543-1557 (2001).
[Crossref]

Spreeuw, R. J. C.

L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw, and J. P. Woerdman, "Orbital angular-momentum of light and the transformation of Laguerre-Gaussian laser modes," Phys. Rev. A 45, 8185-8189 (1992).
[Crossref] [PubMed]

Swartzlander, G.

Tao, S. H.

Torner, L.

G. Molina-Terriza, J. P. Torres, and L. Torner, "Management of the angular momentum of light: preparation of photons in multidimensional vector states of angular momentum," Phys. Rev. Lett. 88, 013601 (2001).
[Crossref]

Torres, J. P.

G. Molina-Terriza, J. P. Torres, and L. Torner, "Management of the angular momentum of light: preparation of photons in multidimensional vector states of angular momentum," Phys. Rev. Lett. 88, 013601 (2001).
[Crossref]

Turunen, J.

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, K. Jefimovs, and J. Turunen, "Generation and selection of laser beams represented by a superposition of two angular harmonics," J. Mod. Opt. 51, 761-773 (2004).
[Crossref]

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, P. Paakkonen, J. Simonen, and J. Turunen, "An analysis of the angular momentum of a light field in terms of angular harmonics," J. Mod. Opt. 48, 1543-1557 (2001).
[Crossref]

Vasnetsov, M.

G. Gibson II, J. Courtial, M. Vasnetsov, S. Barnett, S. Franke-Arnold, and M. Padgett, "Increasing the data density of free-space optical communications using orbital angular momentum," Proc. SPIE 5550, 367-373 (2004).
[Crossref]

G. Gibson, J. Courtial, M. J. Padgett, M. Vasnetsov, V. Pas'ko, S. M. Barnett, and S. Franke-Arnold, "Free-space information transfer using light beams carrying orbital angular momentum," Opt. Express 12, 5448-5456 (2004).
[Crossref] [PubMed]

Vaziri, A.

A. Mair, A. Vaziri, G. Weihs, and A. Zeilinger, "Entanglement of the orbital angular momentum states of photons," Nature 412, 313-316 (2001).
[Crossref] [PubMed]

Wegener, M. J.

N. R. Heckenberg, R. McDuff, C. P. Smith, H. Rubinsztein-Dunlop, and M. J. Wegener, "Laser beams with phase singularities," Opt. Quantum Electron. 24, S951-S962 (1992).
[Crossref]

Weihs, G.

A. Mair, A. Vaziri, G. Weihs, and A. Zeilinger, "Entanglement of the orbital angular momentum states of photons," Nature 412, 313-316 (2001).
[Crossref] [PubMed]

Woerdman, J. P.

M. W. Beijersbergen, R. P. C. Coerwinkel, M. Kristensen, and J. P. Woerdman, "Helical-wavefront laser beams produced with a spiral phaseplate," Opt. Commun. 112, 321-327 (1994).
[Crossref]

L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw, and J. P. Woerdman, "Orbital angular-momentum of light and the transformation of Laguerre-Gaussian laser modes," Phys. Rev. A 45, 8185-8189 (1992).
[Crossref] [PubMed]

Yuan, X.-C.

Zeilinger, A.

A. Mair, A. Vaziri, G. Weihs, and A. Zeilinger, "Entanglement of the orbital angular momentum states of photons," Nature 412, 313-316 (2001).
[Crossref] [PubMed]

Appl. Opt. (1)

J. Mod. Opt. (3)

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, P. Paakkonen, J. Simonen, and J. Turunen, "An analysis of the angular momentum of a light field in terms of angular harmonics," J. Mod. Opt. 48, 1543-1557 (2001).
[Crossref]

S. N. Khonina, V. V. Kotlyar, V. A. Soifer, K. Jefimovs, and J. Turunen, "Generation and selection of laser beams represented by a superposition of two angular harmonics," J. Mod. Opt. 51, 761-773 (2004).
[Crossref]

R. Celechovsky and Z. Bouchal, "Generation of variable mixed vortex fields by a single static hologram," J. Mod. Opt. 53, 473-480 (2006).
[Crossref]

J. Opt. Soc. Am. A (1)

J. Opt. Soc. Am. B (1)

Nature (1)

A. Mair, A. Vaziri, G. Weihs, and A. Zeilinger, "Entanglement of the orbital angular momentum states of photons," Nature 412, 313-316 (2001).
[Crossref] [PubMed]

New J. Phys. (2)

Z. Bouchal and R. Celechovsky, "Mixed vortex states of light as information carriers," New J. Phys. 6, 131 (2004).
[Crossref]

Z. Bouchal, O. Haderka, and R. Celechovsky, "Selective excitation of vortex fiber modes using a spatial light modulator," New J. Phys. 7, 125 (2005).
[Crossref]

Opt. Commun. (1)

M. W. Beijersbergen, R. P. C. Coerwinkel, M. Kristensen, and J. P. Woerdman, "Helical-wavefront laser beams produced with a spiral phaseplate," Opt. Commun. 112, 321-327 (1994).
[Crossref]

Opt. Express (3)

Opt. Lett. (2)

Opt. Quantum Electron. (1)

N. R. Heckenberg, R. McDuff, C. P. Smith, H. Rubinsztein-Dunlop, and M. J. Wegener, "Laser beams with phase singularities," Opt. Quantum Electron. 24, S951-S962 (1992).
[Crossref]

Phys. Rev. A (1)

L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw, and J. P. Woerdman, "Orbital angular-momentum of light and the transformation of Laguerre-Gaussian laser modes," Phys. Rev. A 45, 8185-8189 (1992).
[Crossref] [PubMed]

Phys. Rev. Lett. (4)

G. Molina-Terriza, J. P. Torres, and L. Torner, "Management of the angular momentum of light: preparation of photons in multidimensional vector states of angular momentum," Phys. Rev. Lett. 88, 013601 (2001).
[Crossref]

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[Crossref] [PubMed]

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[Crossref] [PubMed]

Proc. SPIE (1)

G. Gibson II, J. Courtial, M. Vasnetsov, S. Barnett, S. Franke-Arnold, and M. Padgett, "Increasing the data density of free-space optical communications using orbital angular momentum," Proc. SPIE 5550, 367-373 (2004).
[Crossref]

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Figures (5)

Fig. 1
Fig. 1

Iterative algorithm producing the phase-only mask.

Fig. 2
Fig. 2

Some examples of binary amplitude CGH used to measure OAM states. For (a) and (c), white color and black color correspond to transmission of 1 and 0. (a) Pattern of CGH generating two helical beams of topological charge + 7 and 7 , (b) far-field intensity profile of pattern (a), (c) pattern of CGH generating four helical beams of topological charge + 3 , 3 , + 7 , and 7 , (d) far-field intensity profile of pattern (c).

Fig. 3
Fig. 3

(Color online) Schematic of the free-space optical communication system.

Fig. 4
Fig. 4

Intensity patterns captured by the CCD beam profiler. (a) Under the illumination of a T E M 00 laser mode, the numbers indicate topological charges appearing in corresponding orders when the channel state is ( 0 , 0 , 0 , 0 ) , (b) single OAM state of topological charge + 7 detection, i.e., the status of each channel is ( 0 , 0 , 1 , 0 ) in the order of channels ( + 3 , 3 , + 7 , 7 ).

Fig. 5
Fig. 5

Multiplexed OAM states measurements. (a) Numerically calculated power spectrum of status ( 1 , 0 , 1 , 1 ) , (b) numerically calculated power spectrum of status ( 1 , 1 , 1 , 1 ) , (c) intensity profile of a laser beam carrying mixed OAM states 7 , + 3 , and + 7 captured in the distance of 1   m from the SLM, (d) intensity profile of a laser beam carrying mixed OAM status 7 , 3 , + 3 , and + 7 captured in the distance of 1 m from the SLM, (e) measured far-field intensity profile of status ( 1 , 0 , 1 , 1 ) , (f) measured far-field intensity profile of status ( 1 , 1 , 1 , 1 ) .

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