Abstract

A two-dimensional liquid crystal (LC) laser array has been demonstrated by photopumping a single LC sample using a lenslet array consisting of plano–convex microlenses. A 5×5 array of LC lasers (displaying evidence of mutual coherence) spaced by 1mm inactive regions has been generated, which could be combined to yield a single monomode output and allows an almost 50-fold increase in energy density in comparison to a single-focus LC cavity. Furthermore, we have demonstrated how the individual and recombined emission spectra vary with different sample topologies and how polydomain samples can be used to generate a multiwavelength laser emission.

© 2008 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]

2006 (1)

A. D. Ford, S. M. Morris, and H. J. Coles, Mater. Today 9, 36 (2006).
[CrossRef]

2005 (1)

S. M. Morris, A. D. Ford, M. N. Pivnenko, and H. J. Coles, J. Opt. A 7, 215 (2005).
[CrossRef]

2001 (1)

B. Taheri, A. Munoz, P. Palffy-Muhoray, and R. Twieg, Mol. Cryst. Liq. Cryst. Sci. Technol., Sect. A 358, 73 (2001).
[CrossRef]

1998 (1)

1951 (1)

H. De Vries, Acta Crystallogr. 4, 219 (1951).
[CrossRef]

Acta Crystallogr. (1)

H. De Vries, Acta Crystallogr. 4, 219 (1951).
[CrossRef]

J. Opt. A (1)

S. M. Morris, A. D. Ford, M. N. Pivnenko, and H. J. Coles, J. Opt. A 7, 215 (2005).
[CrossRef]

Mater. Today (1)

A. D. Ford, S. M. Morris, and H. J. Coles, Mater. Today 9, 36 (2006).
[CrossRef]

Mol. Cryst. Liq. Cryst. Sci. Technol., Sect. A (1)

B. Taheri, A. Munoz, P. Palffy-Muhoray, and R. Twieg, Mol. Cryst. Liq. Cryst. Sci. Technol., Sect. A 358, 73 (2001).
[CrossRef]

Opt. Lett. (1)

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Figures (4)

Fig. 1
Fig. 1

Illustration of the principle for photopumping an LC sample using a lenslet array that generates a diverging output laser array.

Fig. 2
Fig. 2

Photographs of (a) the lenslet array illuminated by the pump beam, (b) the active fluorescing regions within the LC, (c) the laser array emission, and (d) the interference fringes obtained when recombining the multiple laser emission sources (Cell A, monodomain sample).

Fig. 3
Fig. 3

(top) Two-dimensional intensity profiles of the LC laser array emission for a typical row in the array, and (bottom) the corresponding cross section through the data (Cell A, monodomain sample).

Fig. 4
Fig. 4

Emission spectra of two different LC laser array samples: (a) Cell A (monodomain sample), all individual laser sources are virtually identical, and the emission can be recombined to give an almost monomode output. (b) Cell B (polydomain sample), (broken curves) multiple monomode sources are achieved each arising from a different domain and chiral pitch (solid curve) and recombination of the laser array results in a broadband emission.

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