We describe a new approach for locating the focal position in laser micromachining. This approach is based on a feedback system that uses a charge-coupled device (CCD) camera, a beam splitter, and a mirror to focus a laser beam on the surface of a work piece. We tested the proposed method for locating the focal position by using Zemax simulations, as well as physically carrying out drilling processes. Compared with conventional methods, this approach is advantageous because: the implementation is simple, the specimen can easily be positioned at the focal position, and the dynamically adjustable scan amplitude and the CCD camera can be used to monitor the laser beam’s profile. The proposed technique will be particularly useful for locating the focal position on any surface in laser micromachining.

Nanopore sequencing maps biochemical processes on DNA by detecting negative peaks in the sequence alignment profile. Protein-bound DNA and single-strand broken DNA cannot pass through nanopores, resulting in unaligned regions...

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We report a new method for measuring a beam's shape at the focus point on a surface using an optical system and a CCD camera. An analytical model based on z-axis movement testing has been proposed, and experimental setups have been developed. Analysis of the obtained results allowed us precisely position the specimen for the focuspoint identification.

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