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General design of a circular grating distributed feedback structure.
(Color online) Schematic fabrication process of circular grating polymer dye laser.
SEM images of (a) the mold and (b) the imprinted PMMA film.
(Color online) Nanoimprinted circular grating DFB dye laser spectrum. The measured linewidth is . Left inset: the output laser power vs the absorbed pump energy curve. The threshold pump fluence is . Right inset: polymer laser chip excited by Nd:YAG laser pulse.
(Color online) (a) Far-field image of the emission pattern recorded by a CCD camera. (b) Circular grating DFB laser far-field radiation patterns through a linear polarizer with different orientation angles. The laser emits an azimuthally polarized, well-confined circular beam.
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