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Lowering the excitation threshold of a random laser using the dynamic scattering states of an organosiloxane smectic A liquid crystal
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10.1063/1.3681898
/content/aip/journal/jap/111/3/10.1063/1.3681898
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/3/10.1063/1.3681898
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Chemical structure of the siloxane monomesogen liquid crystal used in this study.

Image of FIG. 2.
FIG. 2.

The transmission of white light through the dye-doped smectic A sample as a function of the frequency of a bipolar electric field at a fixed amplitude of 12 V/μm and a temperature of 25  °C.

Image of FIG. 3.
FIG. 3.

(Color online) Schematic of the alignment and corresponding polarizing optical microscope images of (a) the initial, pre-field, homeotropic state; (b) the dynamic scattering state that is formed using a frequency f ≈ 100 Hz; (c) the scattering state after removal of the applied electric field; (d) the homeotropic (transparent) state when subjected to an electric field with a frequency f > 250 Hz; and (e) the homeotropic state after the removal of the applied electric field.

Image of FIG. 4.
FIG. 4.

(Color online) Photographs of the optical texture recorded via a polarizing optical microscope with and without an applied electric field for different applied frequencies at an amplitude of 12 V/μm: (a) f = 20 Hz, (b) field removed, (c) f = 180 Hz, (d) field removed, (e) f = 250 Hz, and (f) field removed. The images are approximately 200 μm × 300 μm.

Image of FIG. 5.
FIG. 5.

The emission spectrum from the dye-doped smectic A sample for the three different states ((a) transparent, (b) static scattering, and (c) dynamic scattering) with an excitation energy of 21 μJ/pulse. The spike at 532 nm marks the pump laser line.

Image of FIG. 6.
FIG. 6.

(Color online) Emission characteristics of the dye-doped smectic A sample for the three different states: transparent (squares), static scattering (circles), and dynamic scattering (triangles). (a) The peak emission intensity as a function of excitation energy and (b) the full-width at half maximum as a function of excitation energy. The lines in (b) represent sigmoidal fits to the experimental data.

Image of FIG. 7.
FIG. 7.

(Color online) The emission characteristics for different frequencies of the applied electric field. (a) The dependence of the emission intensity as a function of applied frequency. Emission intensity (b) and FHWM (c) as a function of input energy for f = 10 Hz (squares) and f = 100 Hz (circles). The lines in (b) are guides for the eye, whereas in (c) the lines represent sigmoidal fits to the experimental data.

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/content/aip/journal/jap/111/3/10.1063/1.3681898
2012-02-10
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Lowering the excitation threshold of a random laser using the dynamic scattering states of an organosiloxane smectic A liquid crystal
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/3/10.1063/1.3681898
10.1063/1.3681898
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