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(a) General design of an optofluidic circular grating DFB dye laser cavity. (b) Illustration of the Bragg diffraction in the second-order circular grating. First-order Bragg reflection induces coupling to vertical propagating waves, and second-order Bragg reflection leads to in-plane feedback.
Schematic fabrication process of the hybrid PFPE/PDMS laser chip.
(a) SEM images of mold. (b) ESEM images of PFPE replica.
Optofluidic circular grating DFB dye laser spectrum. Inset: the output laser power vs pump energy curve. The threshold pump fluence is .
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