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Improvement in focusing accuracy of DNA sequencing microscope with multi-position laser differential confocal autofocus method.
Optics Express 2018 January 23
High focusing accuracy in microscopes could improve the imaging quality to reduce the error rate in DNA sequencing. We propose a new feedback method to improve the focusing condition to a very high accuracy. A reference laser reflected by the sample is detected by two or more sensors around the confocal point. After acquiring the signals from the out-of-focus positions, online data processing is implemented to provide feedbacks for real-time focus-plane locking on the sample surface. This method provides an accuracy better than 1/10 of the objective depth-of-focus. To balance optical aberrations, a specific optical feedback system should be designed, with athermal design considerations to adapt DNA sequencing work to temperature fluctuations.
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