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Lasing in chiral photonic liquid crystals and associated frequency tuning

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Abstract

This letter addresses a dye-doped planar cholesteric cell as a one-dimensional photonic crystal, which can be lased at the band edges of the photonic band gap. The effect of the composition of the material and the thickness of a cholesteric cell (CLC) on the lasing action, and the photo-control of the lasing frequency, are experimentally investigated. Adding a tunable chiral monomer (TCM) allows the CLC’s reflection band to be tuned by varying the intensity and/or exposure time of the UV curing light, enabling the lasing frequency of the CLC sample to be tuned.

©2004 Optical Society of America

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Figures (7)

Fig. 1.
Fig. 1. Lasing pattern of the dye-doped cholesteric liquid crystal cell stabilized with polymer. The left green light is the pumping light.
Fig. 2.
Fig. 2. Measured reflection bands of CLCs with different chiral concentrations.
Fig. 3.
Fig. 3. Variations of the lasing wavelength with the concentration of the chiral material and the polymer added to the sample. The pumping source was the SHG of a mode-locked Nd:YAG laser pulse with an intensity of ~1μJ.
Fig. 4.
Fig. 4. Reflection bands of CLCs with different cell gaps.
Fig. 5.
Fig. 5. Wedge cell: variance of pitch at various thicknesses.
Fig. 6.
Fig. 6. Lasing spectrum from the wedge CLC cell at various cell gaps; (a) 2μm, (b) 3μm and (c) 10μm.
Fig. 7.
Fig. 7. Variation of the lasing wavelength from a CLC cell to which TCM has been added, with duration of UV irradiation.

Equations (1)

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p = 1 β 0 . c 0 + β TCM . c TCM ,
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