The use of layers with anisotropic molecular orientation in microcavities provides a means for the fabrication of lasing devices based on polyfluorene copolymers. The Figure shows the structure of the polymer film formed by the spin-coating of two mirrors with chloroform solutions of the polymers and pressing them together. The photopumped laser thus achieved shows a low lasing threshold.
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Theander et al. (2001) studied this question.