The order parameter of the transition dipole moment for emission, , (closed squares) and the orientational order parameter associated with the chiral nematic “layers,”/ (open circles) are plotted as a function of temperature for the DCM-doped M18 sample.
The reflection and lasing emission spectra for the DCM-doped sample at (black line) and (gray line).
(a) The spontaneous (fluorescence) and lasing emission spectra for the DCM-doped M18 sample and the DCM-doped sample, respectively, indicating the location of the lasing spectra with regard to the fluorescence spectra (spontaneous emission spectra recorded at ). Also shown is the redshift in the lasing spectra on cooling. (b) is a plot of the laser wavelength as a function of the extraordinary refractive index, .
The excitation energy dependence of the emission energy of the DCM-doped PBE laser at six different temperatures. The inset allows for a closer inspection of the excitation threshold.
The lasing emission spectra for the DCM-doped PBE laser at (a) and (b) obtained using a high-resolution spectrometer .
The slope efficiency, , of the DCM-doped PBE laser as a function of temperature.
A plot of the average fluorescence intensity, , (closed squares) and the average refractive index, (open circles) as a function of temperature.
Laser emission energy measured in the forward lasing direction at an excitation energy of as a function of the orientational order parameter, . The black line is the resultant linear fit to the data points.
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