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Optical properties of tunable organic DFB lasers

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Abstract

Organic lasers of various forms and material compositi on have been studied over the years due to their potential applications as light sources for optical communications. The development of organic light emitting diodes (LEDs) in the last decade has produced a resurgence of interest in the use of organic gai n media for lasing applications[1]. One of the more promising ways to produce feedback in organic media to create a lasing structure employs periodic changes in the refractive index, which forms a distributed feedback (DFB) resonator. This technique dates to the first introduction of organic lasers thirty years ago, and provides the possibility of easy fabrication, low thresholds, and tunability of the output wavelength. We present here results on organic DFB lasers realized with a UV sensitive styrene -copolymer poly(styrene -co-4-vinylbenzyl thiocyanate) (PST-co-VBT) polymers[2,3]. After spin coating on suitable substrates, one ca n inscribe index gratings with or without accompanying surface gratings using UV radiation. Reaction with various gases can fur ther modify the index and surface profiles. The above fabrication procedures can be repeated on the same sample to produce multiple gratings with variable periods as well as angles wit h respect to one another. The final sample morphology is examined with atomic force microscopy. These polymers can be doped with a commercially available laser dye to allow laser emission. The properties of the emission from these types of lasers, such as the directionality, polarization state, and threshold were determine d for various pumping conditions for various pumping conditions. One example of the behavior of these structures is given in figure 1 below. Three gratings with different periods were inscribed in the same polymer layer with an angle of 60 degrees betwee n them. This allows us to tune the laser to three different wavelengths by simply rotating the polarization of the pump beam which selects each grating.

© 2003 Optical Society of America

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