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Comparison of the performance of photonic band-edge liquid crystal lasers using different dyes as the gain medium
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10.1063/1.3284939
/content/aip/journal/jap/107/4/10.1063/1.3284939
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/4/10.1063/1.3284939
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Chemical structures of the laser dyes used in this study: (a) DCM, (b) pyrromethene 580 (PM580), and (c) pyrromethene 597 (PM597).

Image of FIG. 2.
FIG. 2.

Examples of absorbance and unsaturated spontaneous emission (fluorescence) spectra parallel to the director for the dye-doped nematic samples ( dye in E49): (a) DCM (b) PM580, and (c) PM597. The pump wavelength, 532 nm, is indicated by the dashed lines on the absorbance spectra. The spontaneous emission spectra have been normalized such that the maximum value is 1, because different excitation energies were used for each sample.

Image of FIG. 3.
FIG. 3.

The absorption properties of the dye-doped samples. (a) The absorption coefficient as a function of dye concentration, where the dashed lines indicate a linear dependence on concentration. (b) The molar extinction coefficient as a function of dye concentration, where the dashed lines indicate that the extinction coefficient is approximately independent of dye concentration. The key for the figure is as follows: DCM (◼), PM580 (●), and PM597 (▲).

Image of FIG. 4.
FIG. 4.

The quantum efficiency of each dye in the nematic LC host, E49, as a function of concentration by weight. The key for the figure is as follows: DCM (◼), PM580 (●), PM597 (▲).

Image of FIG. 5.
FIG. 5.

The time-resolved fluorescence lifetime as a function of concentration by weight for DCM laser dye in the nematic LC host, E49. Data are shown for an emission wavelength of 600 nm (◆). The excitation wavelength was 475 nm.

Image of FIG. 6.
FIG. 6.

Input-output characteristics for the PBE lasers. In all cases, the host was E49 doped with BDH1281, the emission wavelength was , and the cell thickness was . The excitation source was a Nd:YAG laser . The output energy of the lasers, , was multiplied by a factor of 2 to take into account the emission in the backward direction. The characteristics were graphed by dye concentration: (a) , (b) , (c) , and (d) and as a function of dye: DCM (◼), PM580 (●), and PM597 (▲). The dashed lines indicate linear regions.

Image of FIG. 7.
FIG. 7.

Threshold energies of the long-wavelength PBE lasers grouped by dye: (a) DCM (◼) threshold as a function of dye concentration. (b) PM580 (●) and PM597 (▲) thresholds as a function of dye concentration. The dashed lines indicate linear fits to the data.

Image of FIG. 8.
FIG. 8.

laser slope efficiency as a function of dye concentration for DCM (◼), PM580 (●), and PM597 (▲).

Image of FIG. 9.
FIG. 9.

Number of photons absorbed in the central region of a cell, as a function of dye: DCM (◼), PM580 (●), PM597 (▲), and concentration ( incident energy).

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/content/aip/journal/jap/107/4/10.1063/1.3284939
2010-02-16
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Comparison of the performance of photonic band-edge liquid crystal lasers using different dyes as the gain medium
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/4/10.1063/1.3284939
10.1063/1.3284939
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