Fig. 7.

Confocal images of 200 µm long segments of microfluidic channels cut on (a) the backside with temporal focusing at 0.04 NA and on (b) the front side without temporal focusing at 0.07 NA. (c,d) Side-view white light and fluorescence images of a microfluidic channel cut on the backside with temporal focusing. (e) A hole was ablated into the back surface and imaged from two angles: the spatially chirped dimension (left) and the unchirped dimension (right). (c-e) Scale bar, 200 µm. (f) An illustration comparing channel cross sections for chemical etching with our measurements for front surface laser ablation and for back surface laser ablation.