A rapid prototyping technique is demonstrated which uses a red femtosecond laser to produce a metallic mould which is then directly used for the replica moulding of PDMS. The manufacturing process can be completed in less than 6 h making it a viable technique for testing new designs quickly. The technique is validated by creating a microfluidic device with channels of height and depth of 300 µm, with a ramp test structure where the height and width of the channels reduces to 100 µm to demonstrate the techniques 3D capabilities. The resulting PDMS device was easily removed from the metallic mould and closely replicated the shape aside the expected shrinkage during thermal curing. As the technique uses a single replica process, the surface roughness at the base of the channels corresponds to the un-ablated polished metal mould, resulting in a very low surface roughness of 0.361 nm. The ablated metallic mould surface corresponds to the top of the PDMS device, which is bonded to glass and does not affect the flow within the channels, reducing the need for optimisation of laser parameters. Finally, the device is validated by demonstrating laminar flow with the no-slip condition.

演示了一种快速成型技术，该技术使用红色飞秒激光生产金属模具，然后将其直接用于PDMS的复制成型。制造过程可以在不到6小时的时间内完成，这使其成为一种快速测试新设计的可行技术。通过创建一个微流体设备来验证该技术，该设备的高度和深度为300 µm，并具有斜坡测试结构，其中通道的高度和宽度减小至100 µm，以证明该技术具有3D功能。所得的PDMS装置很容易从金属模具中取出，并在热固化过程中除了预期的收缩率外，将形状紧密复制。由于该技术使用单一复制工艺，因此通道底部的表面粗糙度对应于未烧蚀的抛光金属模具，导致0.361 nm的极低表面粗糙度。烧蚀的金属模具表面对应于PDMS装置的顶部，该顶部与玻璃粘合并且不影响通道内的流动，从而减少了优化激光参数的需要。最后，通过演示层流在不打滑的情况下对设备进行验证。