Abstract
We discuss the implementation and performance of an adaptive optics (AO) system that uses two cascaded deformable phase plates (DPPs), which are transparent optofluidic phase modulators, mimicking the common woofer/tweeter-type astronomical AO systems. One of the DPPs has 25 electrodes forming a keystone pattern best suited for the correction of low-order and radially symmetric modes; the second device has 37 hexagonally packed electrodes better suited for high-order correction. We also present simulation results and experimental validation for a new open-loop control strategy enabling simultaneous control of both DPPs, which ensures optimum correction for both large-amplitude low-order, and complex combinations of low- and high-order aberrations. The resulting system can reproduce Zernike modes up to the sixth radial order with stroke and fidelity up to twice better than what is attainable with either of the DPPs individually. The performance of the new AO configuration is also verified in a custom-developed fluorescence microscope with sensorless aberration correction.
Highlights
Using a deformable mirror (DM) or a liquid crystal spatial light modulator (LC-SLM), it is predominantly the capabilities of this component that limit the quality of aberration correction, and the overall optical system performance
Modulators developed for large stroke are usually limited in spatial frequency of the correction, while the ones intended for high orders can be limited by the available stroke
We have shown the implementation and performance of a new type of Adaptive optics (AO) system employing two cascaded optofluidic phase modulators with contrasting electrode counts and arrangements
Summary
Adaptive optics (AO) is an image correction technique that features a dynamically reconfigurable optical element to compensate for sample-, system-, or medium-induced wavefront aberrations.[1,2] Commonly using a deformable mirror (DM) or a liquid crystal spatial light modulator (LC-SLM), it is predominantly the capabilities of this component that limit the quality of aberration correction, and the overall optical system performance. In contrast to piezoelectrically actuated phase modulators, the DPP is free from hysteresis effects[14,18] and does not require additional modeling or hardware for compensating these unwanted effects.[19,20] These versatile characteristics make DPP applicable to W/T type multi-modulator AO systems, and to the cascading of multiple identical modulators for simple stroke enhancement. Using two closely positioned DPPs of contrasting electrode count and distribution, we experimentally demonstrate the advantage of this configuration in terms of amplitude, order, and fidelity of correcting up to the sixth radial order of Zernike modes. This AO system is integrated into a custom fluorescence microscope to perform sensorless aberration correction for imaging micro-fluorescent beads
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
