Liquid crystal as laser medium with tunable gain spectra

Blinov, L. M.; Cipparrone, G.; Лазарев, В. В.; Pagliusi, P.; Rugiero, T.

doi:10.1364/oe.16.006625

Cited by 6 publications

(1 citation statement)

References 13 publications

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“…al. in 1980 [1] and has been repeated and improved by many other research groups, especially in the last two decades [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. An alternate method has involved UV-light patterning of a rubber photopolymer material.…”

Section: Introductionmentioning

confidence: 99%

Co-extruded mechanically tunable multilayer elastomer laser

Crescimanno¹,

Mao²,

Andrews³

et al. 2011

Opt. Mater. Express

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We have fabricated and studied mechanically tunable elastomer dye lasers constructed in large area sheets by a single-step layer-multiplying co-extrusion process. The laser films consist of a central dye-doped (Rhodamine-6G) elastomer layer between two 128-layer distributed Bragg reflector (DBR) films comprised of alternating elastomer layers with different refractive indices. The central gain layer is formed by folding the coextruded DBR film to enclose a dye-doped skin layer. By mechanically stretching the elastomer laser film from 0% to 19%, a tunable miniature laser source was obtained with ~50 nm continuous tunability from red to green. Optically pumped by a frequency-doubled Nd:YAG laser, the elastomer laser showed a lasing threshold of 0.9 mJ/cm 2 at 600 nm.

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Section: Introductionmentioning

confidence: 99%

Co-extruded mechanically tunable multilayer elastomer laser

Crescimanno¹,

Mao²,

Andrews³

et al. 2011

Opt. Mater. Express

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Quasi-in-plane leaky modes in lasing cholesteric liquid crystal cells

Blinov

Cipparrone

Mazzulla

et al. 2008

Journal of Applied Physics

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Using a planar cell consisting of a prism and a flat glass, we have carried out precise measurements of the angles at which quasi-in-plane leaky (QIPL) laser modes propagate within a thin layer of a cholesteric liquid crystal (CLC) doped with a laser dye. Both the prism and the glass have refraction indices higher than relevant CLC indices, therefore, the waveguide effect in CLC is excluded. For this type of almost thresholdless lasing neither mirrors nor distributed feedback is necessary. The modes are generated in the amplifying CLC layer due to strong Fresnel reflections from the glass boundaries at propagation angles very close to 90° with respect to the cell normal. In the experiment, two modes polarized differently (s- and p-) have been found outgoing from the prism. Using equivalency between optical properties of a CLC and optically negative nematic liquid crystal at the propagation angles close to 90°, the analytical approach known for a uniform nematic liquid crystal was used for calculations of the threshold gain of the QIPL modes in a helical CLC. The gain has been found for the particular eigenmodes whose propagation angles have been measured. The experimental and calculated data on the propagation angles, polarization and threshold gain are in quantitative agreement.

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Scattering and amplification of light in a layer of a nematic liquid crystal

Blinov

2008

Jetp Lett.

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Liquid crystal as laser medium with tunable gain spectra

Cited by 6 publications

References 13 publications

Co-extruded mechanically tunable multilayer elastomer laser

Co-extruded mechanically tunable multilayer elastomer laser

Quasi-in-plane leaky modes in lasing cholesteric liquid crystal cells

Scattering and amplification of light in a layer of a nematic liquid crystal

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