Abstract

In this paper, we demonstrate a compact flattop beam shaper to realize two-dimensional flattop focus through generating a second order full Poincaré beam. Liquid crystal material is used in the device as the voltage-dependent birefringent material to provide appropriate phase retardation modulation. The beam shaper is fabricated and tested. Experimental results show that high quality flattop profiles can be obtained with steep edge roll-off. The tolerance of different input beam sizes of the beam shaper is also verified in the experimental demonstration.

© 2013 Optical Society of America

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References

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    [CrossRef]

2012

O. Homburg and T. Mitra, “Gaussian-to-top-hat beam shaping: an overview of parameters, methods, and applications,” Proc. SPIE 8236, 82360A (2012).
[CrossRef]

2011

W. Cheng, W. Han, and Q. Zhan, “Generation of flattop focusing with second order full Poincaré beams,” Proc. SPIE 8130, 81300D (2011).
[CrossRef]

W. Han, W. Cheng, and Q. Zhan, “Flattop focusing with full Poincaré beams under low numerical aperture illumination,” Opt. Lett. 36, 1605–1607 (2011).
[CrossRef]

2010

2009

2008

J. Dai and Q. Zhan, “Beam shaping with vectorial vortex beams under low numerical aperture illumination condition,” Proc. SPIE 7062, 70620D (2008).
[CrossRef]

2007

2004

2003

2002

2000

1996

1995

1983

Alonso, M. A.

Beckley, A. M.

Brown, T. G.

Cheng, W.

W. Cheng, W. Han, and Q. Zhan, “Generation of flattop focusing with second order full Poincaré beams,” Proc. SPIE 8130, 81300D (2011).
[CrossRef]

W. Han, W. Cheng, and Q. Zhan, “Flattop focusing with full Poincaré beams under low numerical aperture illumination,” Opt. Lett. 36, 1605–1607 (2011).
[CrossRef]

Dai, J.

J. Dai and Q. Zhan, “Beam shaping with vectorial vortex beams under low numerical aperture illumination condition,” Proc. SPIE 7062, 70620D (2008).
[CrossRef]

Dickey, F. M.

L. A. Romero and F. M. Dickey, “Lossless laser beam shaping,” J. Opt. Soc. Am. A 13, 751–760 (1996).
[CrossRef]

F. M. Dickey and S. C. Holswade, Laser Beam Shaping: Theory and Techniques (Marcel Dekker, 2000).

Dong, B. Z.

Gan, X.

Ganic, D.

Gu, B. Y.

Gu, M.

Hain, M.

Han, C.-Y.

Han, W.

W. Cheng, W. Han, and Q. Zhan, “Generation of flattop focusing with second order full Poincaré beams,” Proc. SPIE 8130, 81300D (2011).
[CrossRef]

W. Han, W. Cheng, and Q. Zhan, “Flattop focusing with full Poincaré beams under low numerical aperture illumination,” Opt. Lett. 36, 1605–1607 (2011).
[CrossRef]

Hao, B.

Hoffnagle, J. A.

Holswade, S. C.

F. M. Dickey and S. C. Holswade, Laser Beam Shaping: Theory and Techniques (Marcel Dekker, 2000).

Homburg, O.

O. Homburg and T. Mitra, “Gaussian-to-top-hat beam shaping: an overview of parameters, methods, and applications,” Proc. SPIE 8236, 82360A (2012).
[CrossRef]

Ishii, Y.

Jefferson, C. M.

Leger, J.

Mitra, T.

O. Homburg and T. Mitra, “Gaussian-to-top-hat beam shaping: an overview of parameters, methods, and applications,” Proc. SPIE 8236, 82360A (2012).
[CrossRef]

Murata, K.

Neil, G.

Romero, L. A.

Shinn, M.

Shum, P.

Somalingam, S.

Stankovic, S.

Sun, X. W.

Tan, X.

Tschudi, T.

Wang, Q.

Yang, G. Z.

Zhan, Q.

W. Cheng, W. Han, and Q. Zhan, “Generation of flattop focusing with second order full Poincaré beams,” Proc. SPIE 8130, 81300D (2011).
[CrossRef]

W. Han, W. Cheng, and Q. Zhan, “Flattop focusing with full Poincaré beams under low numerical aperture illumination,” Opt. Lett. 36, 1605–1607 (2011).
[CrossRef]

Q. Zhan, “Cylindrical vector beams: from mathematical concepts to applications,” Adv. Opt. Photon. 1, 1–57 (2009).
[CrossRef]

J. Dai and Q. Zhan, “Beam shaping with vectorial vortex beams under low numerical aperture illumination condition,” Proc. SPIE 7062, 70620D (2008).
[CrossRef]

Zhang, S.

Adv. Opt. Photon.

Appl. Opt.

J. Opt. Soc. Am. A

Opt. Express

Opt. Lett.

Proc. SPIE

O. Homburg and T. Mitra, “Gaussian-to-top-hat beam shaping: an overview of parameters, methods, and applications,” Proc. SPIE 8236, 82360A (2012).
[CrossRef]

J. Dai and Q. Zhan, “Beam shaping with vectorial vortex beams under low numerical aperture illumination condition,” Proc. SPIE 7062, 70620D (2008).
[CrossRef]

W. Cheng, W. Han, and Q. Zhan, “Generation of flattop focusing with second order full Poincaré beams,” Proc. SPIE 8130, 81300D (2011).
[CrossRef]

Other

F. M. Dickey and S. C. Holswade, Laser Beam Shaping: Theory and Techniques (Marcel Dekker, 2000).

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Figures (8)

Fig. 1.
Fig. 1.

Phase pattern loaded into SLM for second order FP beam generation: (a) continuous phase (02π) and (b) four-level quantized phase. (The four-level phase is 0, 0.5π, π, and 1.5π).

Fig. 2.
Fig. 2.

Illustration of the proposed beam shaper cell structure.

Fig. 3.
Fig. 3.

Illustration of proposed ITO electrode patterning. (Blue lines) 100 μm insulated gap where ITO is removed.

Fig. 4.
Fig. 4.

Phase retardation versus LC driving voltage with cell thickness of 12 μm.

Fig. 5.
Fig. 5.

Fabricated ITO electrodes with detailed structure viewed under a white light interferometer. Dark slits are the areas where ITO layer (30nm) is removed.

Fig. 6.
Fig. 6.

Experimental setup of testing the performance of the beam shaper. Laser: linearly polarized HeNe laser; Iris: adjust the input beam size; HW: half-wave plate; CCD: Spiricon camera.

Fig. 7.
Fig. 7.

Flattop profile (a) 2D view and (b) 3D view obtained by testing the fabricated beam shaper.

Fig. 8.
Fig. 8.

3D flattop profile and corresponding line scan of two different input beam diameters: (a) 5 mm and (b) 6.5 mm.

Equations (1)

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β=22πr0y0λf,

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