Color cone lasing emission in a dye-doped cholesteric liquid crystal with a single pitch

Lee, Chia Rong; Lin, Sheng Huang; Yeh, H. C.; Ji, T. D.; Lin, Ken-Ming; Mo, Ting; Kuo, Chie‐Tong; Lo, Kuang Yao; Chang, Shoou-Jinn; Fuh, Andy Ying–Guey; Huang, Shuan Yu

doi:10.1364/oe.17.012910

Cited by 38 publications

(21 citation statements)

References 17 publications

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“…3(b) indicate that a linear increase in θ ring occurs with increasing Δn. In accordance with a similar simulation step described in our previous study [11], the simulation result for dispersion relations (obtained using Berreman's 4 × 4 matrix approach) for a planar CLC structure [17] with various values of Δn yields the simulated oblique angles (θ overlap ). In these angles, the LWE of the corresponding CLCRB overlaps with the SWE of the CLCRB for 0° [represented by the open diamond ◇ in Fig.…”

Section: Resultssupporting

confidence: 52%

“…In the experiment, two setups are utilized for measuring the lasing and transmission spectra (complementary to the reflection spectra) of the DDCLC cells. Associate setups and methods for measurement can be found in our recent published work [11]. In brief, the DDCLC cell is excited by a single incident pumped pulses beam originating from a Qswitched Nd:YAG SHG pulse laser with a wavelength of 532 nm, a pulse duration of 8 ns, a repetition rate of 10 Hz, and a pumped energy of E, at an incident angle of roughly 15° from the cell normal (N).…”

Section: Sample Preparation and Experimental Setupsmentioning

confidence: 99%

“…In the past decade, DDCLC lasers have been widely investigated because of the significance of their edge lasing mechanism [1,2] and their potential applications [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Particularly, in our recent work we observed a novel lasing phenomenon, a color cone lasing emission (CCLE), based on a single-pitched DDCLC cell [11]. The lasing wavelength in the CCLE is distributed continuously within a wide-band, as measured at a continuously increasing cone angle relative to the helical axis along the cell normal.…”

Section: Introductionmentioning

confidence: 99%

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Novel dye-doped cholesteric liquid crystal cone lasers with various birefringences and associated tunabilities of lasing feature and performance

Lin¹,

Lee²

2011

Opt. Express

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This study is the first to investigate novel cone lasers and the tunabilities of their lasing feature and performance based on dye-doped cholesteric liquid crystal (DDCLC) films with various LC birefringences (Δn). A unique conically-symmetric lasing ring with a low energy threshold occurs at a specific nonzero oblique angle (θ(ring)). The low energy threshold is comparable to those for common lasing signals occurring simultaneously at the short- and long-wavelength edges (SWE and LWE) of the CLC reflection band (CLCRB) for 0°. The lasing ring is induced by the enhancement in the density of photonic state for the fluorescence with a wavelength of λ(ring) based on an edge-overlapping effect, in which λ(ring) is just located at an edge-overlapping spectral position of the SWE of the CLCRB for 0° and the LWE of the CLCRB for θ(ring). The lasing feature (i.e., the lasing wavelengths of the three lasing signals and the emitted angle of the lasing ring) are tuned by varying Δn. The simulated relationship of an oblique angle with Δn, in which the SWE of the CLCRB for that oblique angle just overlaps the LWE of the CLCRB for 0°, can be obtained by calculating the dispersion relation of a planar CLC structure with various values of Δn based on Berreman's 4 × 4 matrix approach. The result of the calculation is highly consistent with the experimental data for the dependence of θ(ring) on Δn. Furthermore, the dependence of lasing performance (energy threshold and relative slope efficiency) on Δn for the three lasing signals is also measured, which findings can be used to qualitatively identify positive interaction or competition among the three lasing signals.

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Section: Resultssupporting

confidence: 52%

Section: Sample Preparation and Experimental Setupsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel dye-doped cholesteric liquid crystal cone lasers with various birefringences and associated tunabilities of lasing feature and performance

Lin¹,

Lee²

2011

Opt. Express

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“…Later on, the off-axis Bragg lasing in the dye-doped ChLCs has been reported in Refs. [54][55][56][57] and termed as a colour-cone lasing. Detailed theoretical and experimental investigations of the off-axis Bragg lasing has recently been performed by Palto et al [58] and Pennick et al [59].…”

Section: Lasing In Liquid Crystalsmentioning

confidence: 99%

Optically pumped mirrorless lasing. A Review. Part II. Lasing in photonic crystals and microcavities

Dudok¹,

Nastishin²

2014

Ukr. J. Phys. Opt.

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Abstract. This article is a second part of the review on optically pumped mirrorless lasing. Consideration of random lasing presented in the first part [Nastishin Yu A and Dudok T H, 2013. Ukr. J. Phys. Opt.] is now followed by analysis of the literature on the lasing in photonic structures, which is mainly focussed on dye-doped cholesteric liquid crystals and microcavities, including liquid-crystal microdroplets.

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“…Latter, in Ref. 23, the out-of-normal lasing in CLCs was also very clearly demonstrated but it was called "color cone lasing. "…”

Section: Introductionmentioning

confidence: 99%

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

Palto

Shtykov

Umanskiĭ

et al. 2012

Journal of Applied Physics

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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.

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Color cone lasing emission in a dye-doped cholesteric liquid crystal with a single pitch

Cited by 38 publications

References 17 publications

Novel dye-doped cholesteric liquid crystal cone lasers with various birefringences and associated tunabilities of lasing feature and performance

Novel dye-doped cholesteric liquid crystal cone lasers with various birefringences and associated tunabilities of lasing feature and performance

Optically pumped mirrorless lasing. A Review. Part II. Lasing in photonic crystals and microcavities

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

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