Abstract
The fabrication and characterization of continuously tunable, solution-processed distributed feedback (DFB) lasers in the visible regime is reported. Continuous thin film thickness gradients were achieved by means of horizontal dipping of several conjugated polymer and blended small molecule solutions on cm-scale surface gratings of different periods. We report optically pumped continuously tunable laser emission of 13 nm in the blue, 16 nm in the green and 19 nm in the red spectral region on a single chip respectively. Tuning behavior can be described with the Bragg-equation and the measured thickness profile. The laser threshold is low enough that inexpensive laser diodes can be used as pump sources.
Highlights
Organic semiconductor lasers have attracted a lot of interest since the first realization of lasing in 1996 [1,2]
Continuous thin film thickness gradients were achieved by means of horizontal dipping of several conjugated polymer and blended small molecule solutions on cm-scale surface gratings of different periods
We report optically pumped continuously tunable laser emission of 13 nm in the blue, 16 nm in the green and 19 nm in the red spectral region on a single chip respectively
Summary
Organic semiconductor lasers have attracted a lot of interest since the first realization of lasing in 1996 [1,2]. Organic semiconductor DFB laser chips with a spatially varying lasing wavelength can be tuned quickly by using a pump pulse synchronized rotation scheme [25] In both cases, the thickness gradient of the active layer was fabricated by thermally co-evaporating the small molecule tris(8hydroxyquinoline) aluminum (Alq3) and the laser dye 4-dicyanmethylene-2-methyl-6-(pdimethylaminostyryl)-4H-pyran (DCM) with a rotating shadow mask evaporation technique. The achieved low lasingthresholds allow pumping using a low-cost, compact laser diode which enables hybrid inorganic-organic continuously tunable laser sources
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