Harmonic Distortion of the Induced Helical Structure of the Nematic Liquid Crystal Detected by the Distributed Feedback Laser

Ilchishin, Igor P.; Tikhonov, Evgeniy; Толмачев, А. А.; Fedoryako, A. P.; Shpak, M. T.

doi:10.1080/00268949008038617

Cited by 6 publications

(7 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, the observed oscillation spectrum of an induced CLC was shifted to one edge of the SR band [11,14]. It is known from experiments that, due to a considerable difference between the birefringence magnitudes for both mentioned CLCs, the best thickness for the lasing efficiency was 45-50 and 10-15 µm for the natural CLC and the induced CLC, respectively.…”

Section: Effect Of Lc Texture Quality and Director Orientation On Lasmentioning

confidence: 73%

“…The lasing modes in this case are located on one of the edges of a very strong reflection band (Fig. 15 b) [11,14]. The location of the lasing modes within the strong reflection band is possible only on a defective mode [39], which can be excited under special conditions of a planar structure formation.…”

Section: Models Of Laser Oscillation In Clcmentioning

confidence: 96%

“…In contrast to ɋLC based on cholesterol esters, the lasing in induced CLCs at the different edges of the SR band was performed at the concentration change of a helical pitch [11] and at certain positions of the reflection band and the dye gain band [12].…”

Section: Models Of Laser Oscillation In Clcmentioning

confidence: 99%

“…Induced CLC: birefringence value equals ¨n § 0.1÷0.2. The laser emission spectrum is positioned on one [11,14] or two edges [12] of the reflection band. The similar lasing behaviour finds an explanation within the framework of the lasing model of photonic crystals as cavities [35][36][14][15].…”

Section: Models Of Laser Oscillation In Clcmentioning

confidence: 99%

“…In our previous studies [11], we considered also the lasing in CLCs with high birefringence (induced CLCs). The location of the lasing spectrum on the edges of a SR band arising in such CLCs can be explained by the presence of two spiral structures with different periods.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dye-doped cholesteric lasers: Distributed feedback and photonic bandgap lasing models

Ilchishin

Tikhonov

2015

Progress in Quantum Electronics

View full text Add to dashboard Cite

Section: Effect Of Lc Texture Quality and Director Orientation On Lasmentioning

confidence: 73%

Section: Models Of Laser Oscillation In Clcmentioning

confidence: 96%

Section: Models Of Laser Oscillation In Clcmentioning

confidence: 99%

Section: Models Of Laser Oscillation In Clcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dye-doped cholesteric lasers: Distributed feedback and photonic bandgap lasing models

Ilchishin

Tikhonov

2015

Progress in Quantum Electronics

View full text Add to dashboard Cite

Multiwave out-of-normal band-edge lasing in cholesteric liquid crystals

Palto

Shtykov

Umanskiĭ

et al. 2012

Journal of Applied Physics

View full text Add to dashboard Cite

Highly efficient twisted nematic liquid crystal polarization gratings achieved by microrubbing Appl. Phys. Lett. 101, 041107 (2012) A polarization-independent liquid crystal phase modulation using polymer-network liquid crystals in a 90° twisted cell J. Appl. Phys. 112, 024505 (2012) Fast switchable grating based on orthogonal photo alignments of ferroelectric liquid crystalsWe have investigated the lasing effect in dye-doped cholesteric liquid crystals, where the photonic stop-band for light propagating along the helical axis coinciding with the layer normal is strongly shifted to longer wavelengths with respect to the luminescence band of the dye. In the absence of overlapping of the photonic and luminescence bands, the well-known lasing effect along the normal at the stop-band edges is forbidden. However, the lasing is still allowed for out-of-normal directions, for which the photonic band is shifted to shorter wavelengths corresponding to the luminescence band. Despite of the out-of-normal light propagation, the positive feedback necessary for the lasing is still available in a case of the monodomain cholesteric layer, when its thickness is much less than the optical pumping aperture. We have observed a significantly increased energy threshold for the out-of-normal lasing modes despite they are characterized by lower threshold gain compared to the modes propagating along the helix axis. The increased energy threshold is explained in terms of continuous distribution of the lasing emission over a large angular sector and energy leakage caused by the leaky lasing into the substrates. V C 2012 American Institute of Physics. [http://dx.

show abstract

Role of the sample thickness on the performance of cholesteric liquid crystal lasers: Experimental, numerical, and analytical results

Sanz-Enguita

Ortega

Folcia

et al. 2016

Journal of Applied Physics

View full text Add to dashboard Cite

We have studied the performance characteristics of a dye-doped cholesteric liquid crystal (CLC) laser as a function of the sample thickness. The study has been carried out both from the experimental and theoretical points of view. The theoretical model is based on the kinetic equations for the population of the excited states of the dye and for the power of light generated within the laser cavity. From the equations, the threshold pump radiation energy Eth and the slope efficiency η are numerically calculated. Eth is rather insensitive to thickness changes, except for small thicknesses. In comparison, η shows a much more pronounced variation, exhibiting a maximum that determines the sample thickness for optimum laser performance. The predictions are in good accordance with the experimental results. Approximate analytical expressions for Eth and η as a function of the physical characteristics of the CLC laser are also proposed. These expressions present an excellent agreement with the numerical calculations. Finally, we comment on the general features of CLC layer and dye that lead to the best laser performance.

show abstract

Harmonic Distortion of the Induced Helical Structure of the Nematic Liquid Crystal Detected by the Distributed Feedback Laser

Cited by 6 publications

References 3 publications

Dye-doped cholesteric lasers: Distributed feedback and photonic bandgap lasing models

Dye-doped cholesteric lasers: Distributed feedback and photonic bandgap lasing models

Multiwave out-of-normal band-edge lasing in cholesteric liquid crystals

Role of the sample thickness on the performance of cholesteric liquid crystal lasers: Experimental, numerical, and analytical results

Contact Info

Product

Resources

About