Narrowing the oscillation spectra of a cholesteric liquid crystal laser

Ilchishin, Igor P.; Tikhonov, E. A.; Mykytiuk, T. V.

doi:10.1080/15421406.2018.1542071

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…In this configuration a separate layer is formed for the gain medium that is sandwiched between two CLC layers ( Figure ). This structure creates a defect in the macroscopic helical structure and therefore a leaky mode within the band‐gap 13–17. Furthermore, as the gain medium is de‐coupled from the CLC the device architecture allows for a wide variety of emissive compounds to be used that would not otherwise be soluble in the CLC host 18,19…”

Section: Figurementioning

confidence: 99%

A Thin‐Film Flexible Defect‐Mode Laser

Ali

Lin

Snow

et al. 2020

Advanced Optical Materials

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Laser emission from a flexible defect‐mode structure consisting of two photopolymerized liquid crystal thin films separated by a dye‐doped polymethylmethacrylate defect layer is demonstrated. A simple and cost‐effective film transfer technique is used to fabricate the flexible laser and the corresponding laser emission characteristics, which shows single‐mode laser emission at λ = 582 nm, with an excitation threshold of Eth = 12.3 ± 0.5 µJ cm−2 per pulse and a slope efficiency of ηs = 6.0 ± 0.3%, are presented. The polarization state of the laser emission are also presented and are compared with the findings reported in the literature. Finally, laser‐beam steering is demonstrated up to 42° by subjecting the device to a mechanically induced deformation that creates a radius of curvature of 5 mm, which is of potential interest for conformable and wearable technology platforms.

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Section: Figurementioning

confidence: 99%

A Thin‐Film Flexible Defect‐Mode Laser

Ali

Lin

Snow

et al. 2020

Advanced Optical Materials

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“…As the neat CLC exhibits a PBG, i.e., forbidden band for visible light, when the defect structure is formed, this discontinuity in the CLC helix creates one or more localized leaky modes within the gap from where light can escape. These leaky mode(s) are created by adding a defect in the helix and are therefore known as defect-modes [26][27][28] . When the defect layer is doped with an emissive material that exhibits photoluminescence (PL) emission so that the spectrum overlaps with the leaky mode(s), laser emission can be observed.…”

Section: Defect-mode Structurementioning

confidence: 99%

Developing flexible liquid crystal defect mode lasers

Ali

Lin

Shi

et al. 2020

Emerging Liquid Crystal Technologies XV

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The challenges associated with developing a flexible defect-mode liquid crystal (LC) laser are addressed in this paper.To begin with, we discuss the process for creating a well-aligned photopolymerized film of chiral nematic LC using various surface alignment layers such as polyvinyl alcohol, sulphonic azo-dye and rubbed polyimide. A single mode flexible defect-mode laser is demonstrated with an excitation threshold fluence of 60µJ/cm 2 /pulse. In accordance with previous studies, results from simulations based on the 4×4 Berreman model show that the wavelength and the number of laser modes are determined by the thickness of the defect layer. The proposed flexible laser can be used to form lasers that can be integrated into conformable platforms and that can be used to control the beam direction without the need for additional optical components.

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Optical characteristics and lasing spectra of a cholesteric liquid crystal with defects of different types

Ilchyshyn

Mykytiuk

2022

Molecular Crystals and Liquid Crystals

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Narrowing the oscillation spectra of a cholesteric liquid crystal laser

Cited by 4 publications

References 17 publications

A Thin‐Film Flexible Defect‐Mode Laser

A Thin‐Film Flexible Defect‐Mode Laser

Developing flexible liquid crystal defect mode lasers

Optical characteristics and lasing spectra of a cholesteric liquid crystal with defects of different types

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