Abstract
Due to the increasing importance of microfluidic chips in medical, nuclear, and chemical industries, we focused on improving various parameters in manufacturing their components, most importantly microchannels. Channels with a length of several hundred microns are constructed based on two crucial factors: substrates and the procedure. Numerous substrates can be employed, amongst which PMMA polymer has been chosen due to its transparency, flexibility, and cheapness with respect to glass. As for the procedure, laser ablation is commonly used for manufacturing microchannels. Nanosecond KrF laser is used to advantage from not only its high absorption of polymeric material in ultra-violet wavelengths but also its higher accessibility and cost-effectiveness. In this paper, irradiation parameters are optimized including the scanning speed of the laser, laser fluence, and repetition rate of the laser pulse in the fabrication of microchannels on PMMA polymer. The fluidic properties of the fabricated channels such as hydraulic diameter, Reynolds number, and the regime of water flow are also investigated. Results confirm the domination of the laminar regime for water flow in these microchannels.
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