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Confocal Fluorescence Microscopy

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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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Updated: Sep 11, 2025

Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT

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All-solid-state omnidirectional fast scanning using liquid crystal optical phased array and conical mirror.

Shuanglong Zhou, Jie Cao, Qun Hao

|August 13, 2025

Summary

This summary is machine-generated.

This study introduces an innovative omnidirectional scanning model using a liquid crystal optical phased array (LC-OPA) and a conical mirror. This system significantly enhances the field of view and reduces scanning time for optical phased arrays without mechanical parts.

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Video-rate Scanning Confocal Microscopy and Microendoscopy

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Published on: October 20, 2011

Area of Science:

Optics and Photonics
Solid-State Physics
Materials Science

Background:

Optical phased arrays (OPAs) enable mechanical-free beam steering.
Current OPAs face limitations in scanning field of view (FOV) and scanning speed.
Addressing these limitations is crucial for advancing OPA applications.

Purpose of the Study:

To develop an omnidirectional scanning model for OPAs.
To overcome the narrow FOV and long scanning periods of conventional OPAs.
To integrate liquid crystal OPAs with conical mirrors for enhanced performance.

Main Methods:

Proposed an omnidirectional scanning model combining a liquid crystal optical phased array (LC-OPA) and a conical mirror.
Generated annular beams using the LC-OPA.
Integrated the LC-OPA with a passive conical mirror for beam manipulation.

Main Results:

Achieved a scanning field of view (FOV) of 360°×2.1°.
Demonstrated a scanning error of less than 0.04°.
Reduced the scanning period to 1/4800 of a 2D grating system, with no mechanical parts.

Conclusions:

The combined LC-OPA and conical mirror system effectively achieves omnidirectional scanning.
This novel approach significantly expands the FOV and accelerates scanning speeds.
The system offers a promising solution for future solid-state beam steering applications.