Amplification of the emission of a liquid-crystal microlaser by means of a uniform liquid-crystal layer

Shtykov, N. M.; Barnik, M. I.; Blinov, L. M.; Umanskiĭ, B. A.

doi:10.1134/s002136400712003x

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…As one can see the threshold of amplification of spontaneous fluorescence is 0.65MW/cm 2 and maximum value of the gain is 0.0014μm -1 . This value is significantly less compared to the values found in [5]. The possible reason for the small values of gain parameters in the waveguide mode can be light scattering on both defects in the LC structure and on fluctuations of the LC director.…”

Section: Waveguide Amplification Of Dye Fluorescence In An Nlc Layermentioning

confidence: 55%

“…In this paper we have estimated the gain of an active nematic LC medium in the waveguide propagation mode for the fluorescence of a DCM dye. In [5], we demonstrated for the first time the possibility of amplifying LC lasing by a planarly aligned LC layer doped with a lasing dye. In that case, the gains reached the principal values α|| = 0.066 μm -1 and α = 0.056 μm -1 .…”

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confidence: 99%

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Waveguide amplification of dye fluorescece in NLC

et al. 2018

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The amplification of spontaneous fluorescence in a planar layer of a nematic liquid crystal doped with a DCM dye is experimentally studied in a waveguide mode of light propagation. The optical pumping threshold of the superfluorescence is 0.65 MW/cm2. The gain value reaches 0.0014 μm-1 at a pumping intensity of 1.38 MW/cm2. Full Text: PDF ReferencesLiquid Crystal Microlasers, Eds. L. M. Blinov, R. Bartolino (Kerala India, Transworld Research Network 2010). DirectLink H. Kogelnik, C. V. Shank, "Coupled‐Wave Theory of Distributed Feedback Lasers", J. Appl. Phys. 43, 2327 (1972). CrossRef I. P. Il'chishin, E. A. Tihonov, V. G. Tishchenko, M. T. Shpak, "Generation of a tunable radiation by impurity cholesteric liquid crystals", JETP Lett. 32, 25 (1980). DirectLink A. Yariv, M. Nakamura, "Periodic structures for integrated optics", IEEE Quant. Electr. 13, 233 (1977). CrossRef N. M. Shtykov, M. I. Barnik, L. M. Blinov B. A. Umanskii, S, P. Palto, "Amplification of the emission of a liquid-crystal microlaser by means of a uniform liquid-crystal layer", JETP Lett. 85, 602 (2007). CrossRef

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Section: Waveguide Amplification Of Dye Fluorescence In An Nlc Layermentioning

confidence: 55%

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confidence: 99%

Waveguide amplification of dye fluorescece in NLC

et al. 2018

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“…In dense dye solutions at high pump fluence, the value may reach several hundreds cm −1 , both in the isotropic amplifying solutions 6 and in the liquid crystal amplifiers. 7 The amplifying dye solutions also manifest a strong pump dependence of the polarization ratio on amplified spontaneous emission (ASE). 8 The nanoparticles embedded in amplifying dye solutions dramatically modify their luminescence and lasing properties.…”

Section: Introductionmentioning

confidence: 99%

BAND NARROWING AND GAIN SPECTRA OF LASER DYE SOLUTIONS WITH SCATTERING TiO₂ NANOPARTICLES

Blinov

Chidichimo

Cipparrone

et al. 2008

J. Nonlinear Optic. Phys. Mat.

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The spectra of amplified spontaneous emission (ASE) intensity and gain have been measured for solutions of laser dye Rhodamine-640 in glycerin with light scattering TiO 2 nanoparticles. Such solutions typically manifest random lasing in backscattering geometry. In this work, the conventional transverse pump geometry is used, and the ASE gain spectra are measured using a variation of the length of the illuminated (pumped) stripe. In this geometry, with increasing concentration of nanoparticles, the "unidirectional" gain along the stripe decreases dramatically. At the same time, strong narrowing of the ASE bandwidth is observed even in the absence of net gain. The experimental results help one to understand the role of the scattering particles in the light amplification. On the one hand, the particles increase a zigzag type of the light path within the amplifying medium, which results in bandwidth narrowing and strong amplification of chaotic light beams. On the other hand, the amplification of a seed beam propagating in a selected direction is dramatically suppressed. The results are discussed using simple modeling of ASE amplification and qualitative arguments.

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“…In dense dye solutions at high pump fluence, the gain may reach values of several hundred. 3,4 Therefore, the dye solutions were recently recognized as perspective media for microlasers such as microfluidic lasers equipped with micromirrors, 5 distributed feedback lasers based on cholesteric [6][7][8] and field controlled nematic 9,10 liquid crystals, mirrorless lasers on waveguiding leaky modes, 11 etc.…”

Section: Introductionmentioning

confidence: 99%

Polarized Spectra of Amplified Spontaneous Emission and Gain for Glycerin Solutions of Dye Rhodamine-640

Blinov

Cipparrone

Лазарев

et al. 2007

J. Nonlinear Optic. Phys. Mat.

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The polarized spectra of the intensity and gain of the amplified spontaneous emission (ASE) have been measured for two glycerin solutions of a laser dye Rhodamine-640 (RhA and RhB with concentrations of 3 × 10 −4 and 3 × 10 −3 M/L, respectively). The solutions were pumped by the linearly polarized light. The ASE polarization ratio r strongly depends on the pump pulse energy, which is continuously increasing up to one for RhA and saturating at the level of r ≈ 0.8 for RhB. The gain spectra have been measured by variation of the amplification length for ASE. With increasing pump beam energy, the maximum gain continuously grows for RhA and saturates for RhB, reaching the values of 14-15 and 6 cm −1 for both materials for the polarization parallel to the pump beam polarization. At a particular spectral point, the gain coefficient has also been measured by the direct amplification of the probe beam of a microlaser on a cholesteric liquid crystal.

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Amplification of the emission of a liquid-crystal microlaser by means of a uniform liquid-crystal layer

Cited by 9 publications

References 4 publications

Waveguide amplification of dye fluorescece in NLC

Waveguide amplification of dye fluorescece in NLC

BAND NARROWING AND GAIN SPECTRA OF LASER DYE SOLUTIONS WITH SCATTERING TiO₂ NANOPARTICLES

Polarized Spectra of Amplified Spontaneous Emission and Gain for Glycerin Solutions of Dye Rhodamine-640

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Amplification of the emission of a liquid-crystal microlaser by means of a uniform liquid-crystal layer

Cited by 9 publications

References 4 publications

Waveguide amplification of dye fluorescece in NLC

Waveguide amplification of dye fluorescece in NLC

BAND NARROWING AND GAIN SPECTRA OF LASER DYE SOLUTIONS WITH SCATTERING TiO2 NANOPARTICLES

Polarized Spectra of Amplified Spontaneous Emission and Gain for Glycerin Solutions of Dye Rhodamine-640

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BAND NARROWING AND GAIN SPECTRA OF LASER DYE SOLUTIONS WITH SCATTERING TiO₂ NANOPARTICLES