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(Color) The measured average reflection wavelength of the dye-doped CLC cell as a function of the temperature (a) and image of the gradient CLC reflection band (b).
The schematic of experimental setup. A: attenuator; BS: beam splitter; CF: color filter; E: energy meter; L: lens; P: polarizer; QW: quarter wave plate; S: spectrometer; TC: temperature controller.
(Color online) (a) Normalized laser emission and (b) the corresponding transmission spectra of the dye-doped CLC cells with various PBGs at different sample positions. Positions 1–5 correspond to , 28.8, 27.6, 26.8, and 26.0 °C, respectively. The gray line represents the dye’s fluorescence spectrum. The laser emission occurs at band edge.
The laser emission intensity from the dye-doped CLC cell as a function of: (a) the excitation energy of the pumping beam at 532 nm and (b) the threshold excitation energy as a function of the lasing wavelength.
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