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Broadband optical amplifier based on a conjugated polymer

Broadband optical amplifier based on a conjugated polymer,J. R. Lawrence,G. A. Turnbull,I. D. W. Samuel

Broadband optical amplifier based on a conjugated polymer   (Citations: 7)
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ues for the gain close to the peak of the spectrally narrowed emission profile. So while the presence of gain in conjugated polymers is well established, a direct demonstration of strong amplifica- tion in which a weak probe beam is amplified to an intense beam has not yet been reported. In this letter, we address this through the demonstration of a broadband optical amplifier based on a conjugated polymer, and studies of the physics of the device including saturation effects. The amplifier is seeded with a widely tunable probe pulse from a dye laser to allow measurements of gain throughout the polymer emis- sion band. We observe very substantial single-pass gains in solution, and investigate the effect of chromophore concen- tration and probe intensity on the amplification. The conjugated polymer used in this study is poly@2- methoxy-5-~28,68-dimethyloctyloxy!-paraphenylene vinyl- ene# (OC1C10- PPV). Figure 1 shows the structure of the polymer together with its absorption and photoluminescence spectra. The photoluminescence ranges from 500 to 700 nm, illustrating the broad emission band over which gain might be achieved. The absorption and emission bands are substan- tially separated in wavelength, 4 which can lead to reduced
Published in 2002.
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    • ...One of the aspects that are being investigated is the spectral shift with distance of the emission power of active POFs doped with organic dyes, which can be employed for making tunable fiber lasers and amplifiers [7]–[9]...
    • ...The analysis above threshold can serve to tune the spectral gain of an active POF by changing the fiber distance traveled by the pump power [7]–[9]...

    J. Arrueet al. Computational Analysis of the Power Spectral Shifts and Widths Along D...

    • ...Although the presence of the gain in optically pumped solutions of organic semiconductors has been observed using transient absorption and VSL techniques, it was not until recently that large amplification was reported in a conjugated polymer [8], [9]...
    • ...(Reused with permission from [8].) Amarasinghe et al.: Organic Semiconductor Optical Amplifiers...
    • ...Fig. 8 summarizes the gain values achieved in solutionbased amplifiers, which use organic semiconductors [8], [9], [53] and laser dyes [56], [57]...

    Dimali Amarasingheet al. Organic Semiconductor Optical Amplifiers

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