| Micorfluidics can accurately control and detect compact fluids.Optofluidics is a frontier interdisciplinary subject formed by containing optics and microfluidics.In this paper,we put forward two kinds of microfluidic dye lasers.One is optofluidic white dye laser based on FabryPerot cavity,the other is dye random laser.In recent years,lasers with a wavelength span the full visible spectrum,particularly the red,green and blue colors,have been widely used in laser lighting,laser color imaging and display,biological and chemical sensing.In addition,with the development of optofluidics,the fabrication of integrated light source with small volume and low consumption has caused much attention.We fabricated the PDMS chip with microcavity in it by soft lithography and rapid prototyping.The multimode optical fibers with smooth Ag-coated end faces are put in chip channels as reflectors.Then the Fabry-Perot cavity is obtained.Three dyes can achieve the primary colors of blue,green and red,respectively.When their ethanol solutions are injected into chip channel at the same time with a stable laminar flow,the white laser can be obtained under the incidence of pump source.Controlling the flow rate of three dye solutions can change the proportion of them in the channel,and finally realize the tunability of emitted light.The random lasers can achieve laser output without relying on traditional resonators.We add nano-titanium dioxide into dye solution to enhance scattering and then inject the mixed dye solution into chip channel by a syringe pump.Finally we realize a random laser with a low threshold.Compared with traditional lasers,optofluidic lasers have the advantages of flexibility,compactness and tunability.They are the new development direction of microfluidic systems and have a wide application prospect in biology,chemistry and medical treatment.The two lasers proposed in this paper are easy to fabricate,small in volume,low in threshold,which paves the way for further experimental research. |
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