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(Color online) (a) Emission spectrum of a microring laser (see inset) fabricated from DOO-PPV polymer on a nylon microfiber in diameter measured above the laser threshold. (b) Power Fourier transform (PFT) spectrum of the emission spectrum in (a). The inset shows the emission intensity vs. excitation intensity, with laser threshold at /pulse. (c) PFT of polymer microring laser emission spectra having various diameters as indicated. The inset shows the obtained for the gain medium using Eq. (3).
(Color online) (a) Laser emission spectra and (b) the corresponding PFT of a polymer microring laser subjected to uniaxial stress, with strain up to 12% as indicated. The arrows in (b) point to the fourth discrete FT harmonics for better showing the decrease in induced upon stretching. The inset of (a) shows the stretching direction, the initial and final lengths, and diameters and , respectively.
(Color online) (a) Change in the laser parameter (red circles; left scale) induced upon stretching obtained from the analysis of the emission spectra in Fig. 2 using Eq. (3); the corresponding changes in (blue squares; right scale) measured by an optical microscope are also given for comparison. (b) Calculated change in induced upon stretching, as obtained from the data in (a). (c) Refraction index dispersion spectrum of an unstretched (blue line) and stretched (red line) polymer film on a nylon substrate subjected to strain of . The inset shows the corresponding change in spectrum plotted with the same color code.
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