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Mechanically tunable conjugated polymer distributed feedback lasers
12.D. R. Barbero, M. S. Saifullah, P. Hoffmann, H. J. Mathieu, D. Anderson, G. A. Jones, M. E. Welland, and U. Steiner, Adv. Funct. Mater. 17, 2419 (2007).
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Herein we report a low-threshold organic laser device based on semiconducting poly(-dioctylfluoren-2,7-diyl-alt-benzothiadiazole) (F8BT) encapsulated in a mechanically stretchable polydimethylsiloxane(PDMS) matrix. We take advantage of the natural flexibility of PDMS to alter the periodicity of the distributed feedback grating which in turn tunes the gain wavelength at which the resonant feedback is obtained. This way, we demonstrate that low-threshold lasing [ (5.3 nJ)] is maintained over a large stretching range of 0%–7% which translates into a tuning range of about 20 nm.
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