Fiber-to-fiber nonlinear coupling via a nematic liquid crystal

Nyushkov, Boris; Trashkeev, S. I.; Ivanenko, Aleksey; Kolker, D. B.; Purtov, P. A.

doi:10.1088/1612-202x/14/1/015104

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…The source of an inhomogeneous violation of the structure or deformation with the subsequent effect on the generation itself can be the light-induced Frederiks reorientation [10,11], thermo-mechanical [12] and the thermo-orientation mechanism [13], leading to the formation of disclination [9]. Additionally, due to self-focusing of the pumping radiation, stable radiation propagation channels [17,18] and orientational structures forming optical vortexes [19] can be formed and also affect the generation of lasing. Many processes can be accompanied by hydrodynamic fluid movements [12,20].…”

Section: Resultsmentioning

confidence: 99%

Harmonic generation in a nematic liquid crystal

Trashkeev¹,

Vasenin²,

Vatnik³

et al. 2020

Laser Phys. Lett.

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The nonlinear optical properties of a nematic liquid crystal (NLC 1289) were experimentally studied according to the intensity and polarization of the pump radiation at a wavelength of 1.56 µm. It is shown that the maximum generation efficiencies of the second and third harmonics correspond to different polarization characteristics of the main radiance. In the investigated range (10 6 … 2 • 10 7 W cm −2 ) the nonmonotonic dependence of the second harmonic intensity on the pump radiance power was demonstrated for the first time. In addition to this, explanation of this effect is also proposed.

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Section: Resultsmentioning

confidence: 99%

Harmonic generation in a nematic liquid crystal

Trashkeev¹,

Vasenin²,

Vatnik³

et al. 2020

Laser Phys. Lett.

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“…This approach makes it possible to set the required polarisation state by adjusting a single cavity element and to reproduce the laser radiation parameters in successive initiations of modelocked operation. Moreover, in the proposed method, a liquid crystal element [28,29] may be used instead of a mechanically rotated phase plate, thus allowing complete electronic control over the mode-locked operation of the studied laser.…”

Section: Npe-mode-locked Lasersmentioning

confidence: 99%

Mode-locked fibre lasers with an adjustable drop-shaped cavity

et al. 2017

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We report the first implementation of a new cavity topology for mode-locked fibre lasers. This new 'drop-shaped' cavity topology employs a dual-fibre optical collimator and allows for a relatively simple cavity design with continuously adjustable length. It combines the advantages of the conventional ring cavity topology with the adjustment capabilities of hybrid ring-linear cavities (e.g. σ-cavities). Reliable femtosecond pulsed lasing was demonstrated in the experimental drop-shaped Er-doped fibre lasers, which were mode-locked in two different ways-by exploiting nonlinear polarisation evolution (NPE) and by means of a semiconductor saturable absorber. In the case of NPE-based mode locking, the shortest pulse duration was ~450 fs. The pulse repetition rate could be continuously varied within ±3 kHz around ~25 MHz in the NPE-mode-locked lasers when the distance between the dual-fibre optical collimator and the cavity mirror was adjusted. This feature could, in principle, allow active stabilisation of the pulse repetition rate. Thus, mode-locked fibre lasers with the proposed drop-shaped cavity topology could be applied in metrology and other fields where a high stability of pulse repetition rate or its synchronization with an external clock is required.

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“…Liquid crystal (LC) materials are always in the spotlight due to their great prospects for applications in emerging display technologies [ 1 ] and ever-changing LC photonics, such as virtual reality display, augmented reality display [ 2 ], 3D display [ 3 ], phase modulators [ 4 ], zoomable lenses [ 5 ], fiber optic communication [ 6 ], beam steering [ 7 ] and tunable terahertz devices [ 8 ]. These extensive applications have also presented several performance requirements for the development of LC materials.…”

Section: Introductionmentioning

confidence: 99%

Fluorination Improves the Electro-Optical Properties of Benzoxazole-Terminated Liquid Crystals in High Birefringence Liquid Crystal Mixtures: Experimental and Theoretical Investigations

et al. 2023

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Aromatic heterocyclic liquid crystal (LC) materials have received much attention from LC chemists for their high birefringence and large dielectric anisotropy, yet few have reported their properties in LC mixtures. In this work, a series of fluorinated benzoxazole liquid crystal compounds were synthesized to evaluate their electro-optical properties in high birefringence LC mixtures, with the expectation of further establishing the theoretical basis and experimental evidence for their applications in LC photonics. Firstly, the effects of the lateral fluorine substituent positions on the molecular synthetic yield, mesomorphic and solubility properties were comparatively investigated. Afterwards, we focused on the fluorination effects on the core electro-optical properties, including birefringence, dielectric anisotropy and further investigation of the viscoelastic coefficient of high birefringence LC mixtures. Research results showed that the benzoxazole liquid crystal compounds possess low melting points, wide nematic phase intervals and good solubility by appropriate lateral fluorine substitution, which is beneficial to further improve the electro-optical properties of high birefringence LC mixtures. Meanwhile, the theoretical and experimental results corroborate each other to well reveal the structure–property relationship. This study demonstrates that fluorination would promote promising applications of benzoxazole-terminated liquid crystals in emerging LC optical devices.

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Fiber-to-fiber nonlinear coupling via a nematic liquid crystal

Cited by 4 publications

References 9 publications

Harmonic generation in a nematic liquid crystal

Harmonic generation in a nematic liquid crystal

Mode-locked fibre lasers with an adjustable drop-shaped cavity

Fluorination Improves the Electro-Optical Properties of Benzoxazole-Terminated Liquid Crystals in High Birefringence Liquid Crystal Mixtures: Experimental and Theoretical Investigations

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