Abstract

We demonstrate an efficient method for transformation of a radially polarized Laguerre–Gaussian beam to a nearly Gaussian beam with much higher beam quality. The method is based on separation of the radially polarized mode into two degenerate modes and coherent addition of the modes after phase flattening. We transformed a high-power Nd:YAG radially polarized (0,1)* Laguerre–Gaussian beam with M2=2.52 and power of 30W into a nearly Gaussian beam with M2=1.3. As a result, the brightness increased by a factor of 2.5.

© 2007 Optical Society of America

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References

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2003

2002

2001

R. Oron, Y. Danziger, N. Davidson, A. A. Friesem, and E. Hasman, Prog. Opt. 42, 325 (2001).
[CrossRef]

2000

1999

R. Oron, Y. Danziger, N. Davidson, A. A. Friesem, and E. Hasman, Appl. Phys. Lett. 74, 1373 (1999).
[CrossRef]

1996

T. Graf and J. E. Balmer, Opt. Commun. 131, 77 (1996).
[CrossRef]

1993

1990

A. E. Siegman, Proc. SPIE 1224, 2 (1990).
[CrossRef]

Ait-Ameur, K.

Balmer, J. E.

T. Graf and J. E. Balmer, Opt. Commun. 131, 77 (1996).
[CrossRef]

Danziger, Y.

R. Oron, Y. Danziger, N. Davidson, A. A. Friesem, and E. Hasman, Prog. Opt. 42, 325 (2001).
[CrossRef]

R. Oron, Y. Danziger, N. Davidson, A. A. Friesem, and E. Hasman, Appl. Phys. Lett. 74, 1373 (1999).
[CrossRef]

Davidson, N.

Denis, R. S.

Friesem, A. A.

Glur, H.

Graf, T.

T. Graf and J. E. Balmer, Opt. Commun. 131, 77 (1996).
[CrossRef]

Hasman, E.

Hierle, R.

Ishaaya, A. A.

Jackel, S.

Kim, G. H.

Kimura, W. D.

Machavariani, G.

Meir, A.

Moshe, I.

Oron, R.

R. Oron, Y. Danziger, N. Davidson, A. A. Friesem, and E. Hasman, Prog. Opt. 42, 325 (2001).
[CrossRef]

R. Oron, N. Davidson, A. A. Friesem, and E. Hasman, Opt. Lett. 25, 939 (2000).
[CrossRef]

R. Oron, Y. Danziger, N. Davidson, A. A. Friesem, and E. Hasman, Appl. Phys. Lett. 74, 1373 (1999).
[CrossRef]

Passily, N.

Roch, J.-F.

Roth, M. S.

Shimshi, L.

Siegman, A. E.

A. E. Siegman, Proc. SPIE 1224, 2 (1990).
[CrossRef]

Tidwell, S. C.

Treussart, F.

Weber, H. P.

Wyss, E. W.

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Figures (4)

Fig. 1
Fig. 1

Arrangement for transforming a radially polarized ( 0 , 1 ) * LG beam into a nearly Gaussian beam. PBS, polarizing beam splitter; QR, 90° quartz rotator; M, mirrors; BPE, binary phase elements; NPBS, nonpolarizing 50% beam splitter. The insets show the experimental intensity distributions of the input radially polarized mode and of the beams after the PBS.

Fig. 2
Fig. 2

Calculated near-field (a) and far-field (b) intensity distributions of the beam, outgoing from the arrangement of Fig. 1. (c) Calculated far-field intensity cross-section for our transformation (solid curve), together with the case when the near-field has exact intensity distribution of LG ( 0 , 1 ) * mode and flat phase (dotted curve). The x-distance is normalized to the waist parameter w of the LG ( 0 , 1 ) * mode.

Fig. 3
Fig. 3

Experimental intensity distributions of the beam obtained in the output of the converter of Fig. 1. (a) Near-field, (b) far-field, (c) experimental (solid curve) and theoretical (dashed curve) far-field cross-section along the x-axis.

Fig. 4
Fig. 4

Near-field (a) and far-field (b) intensity distributions of a high-quality nearly Gaussian beam obtained after spatial filtering.

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