Vertically emitting, dye-doped polymer laser in the green (λ ∼ 536 nm) with a second order distributed feedback grating fabricated by replica molding
✍ Scribed by M. Lu; B.T. Cunningham; S.-J. Park; J.G. Eden
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 781 KB
- Volume
- 281
- Category
- Article
- ISSN
- 0030-4018
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✦ Synopsis
Lasing in the green from a distributed feedback (DFB) structure, based upon a second order grating fabricated by replica molding in a dye-doped UV curable polymer, has been demonstrated. For a Bragg grating having a periodicity and depth of 360 ± 2 nm and 78 ± 5 nm, respectively, a coumarin 540-polymer laser operates at 535.6 nm, which is in agreement with calculations of the photonic band diagram for the structure. The fabricated laser exhibits a linewidth of 0.15 nm, a threshold pump fluence of $0.7 mJ cm À2 at 355 nm, and a slope efficiency of $14%. Incorporation of the dye gain medium into a one-(or two-) dimensional photonic crystal and fabrication of the grating by replica molding at room temperature provides an inexpensive approach to fabricating polymer-based DFB lasers on flexible substrates of large area.