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(Color online) Overview of the fabricated microfluidic dye laser. (a) Top-view picture of the overall layout of the fabricated chip. The shallow high meandering channel facilitates capillary filling of the embedded laser resonator. (b) Optical micrograph of the DFB laser resonator embedded in the shallow meandering channel. (c) Side-view sketch showing the layers of the DFB laser resonator. (d) Scanning electron micrograph showing the third order Bragg grating of nanofluidic channels which constitutes the DFB laser resonator (prior to bonding).
Normalized laser spectra from four nominally identical chips demonstrating wafer-scale spectral reproducibility of the laser. On each chip, the DFB laser resonator is filled by capillary action with rhodamine 6G (R6G) dissolved in ethylene glycol. The average laser wavelength of the chips is with a standard deviation of .
Normalized laser spectra and corresponding laser output power curves as a function of pump pulse fluence for R6G in three different solutions: (a) R6G in ethanol, (b) R6G in ethylene glycol, and (c) R6G in a 1:1 mixture of ethylene glycol and benzyl alcohol. The results are summarized in Table I .
Summary of the results. For R6G solutions of larger refractive indices , the laser wavelength increases, and the threshold pump fluence and coupling loss decrease.
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