Off-Axis Reflective Microscopy for Zero Chromatic Aberration
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Solution Overview
Problem
Current microscopes are limited by chromatic aberrations, group delay dispersion, and low throughput, particularly in the UV and IR regions, making it difficult to observe biological phenomena across a wide spectrum simultaneously and requiring multiple microscopes for different spectral bands.
Innovation Solution
Development of all-reflective microscopes with off-axis optical systems using freeform surfaces and metallic coatings to minimize chromatic aberrations, reduce group delay dispersion, and enhance throughput, enabling imaging from UV to far-IR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional refractive microscope optics are used, then the system is simpler to manufacture, but chromatic aberrations and group delay dispersion increase significantly
Solution Approach 1:
The patent changes the fundamental optical parameter from refractive to reflective optics. By using mirrors instead of lenses, the system eliminates chromatic aberrations and reduces group delay dispersion, as reflective surfaces do not disperse light by wavelength. This parameter change fundamentally resolves the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The patent employs composite optical systems combining multiple mirror types (parabolic, hyperbolic, and freeform mirrors) with different geometric properties. This composite approach allows the system to achieve both chromatic aberration-free operation and controlled beam shaping, resolving the contradiction by integrating multiple optical functions into a unified reflective system.
2Adaptability or versatility
If multiple microscopes are used for different spectral bands, then spectral imaging coverage is improved, but system complexity and cost increase
Solution Approach 1:
The patent creates a universal microscope system that can operate across UV, visible, and IR spectral bands using a single all-reflective optical design. The system achieves multi-functionality by using mirrors with broad spectral reflectivity, eliminating the need for multiple specialized microscopes and thereby reducing overall system complexity while expanding spectral coverage.
Solution Approach 2:
The patent segments the optical system into distinct functional modules (objective mirrors, relay mirrors, imaging mirrors) that can be independently optimized for different spectral regions. This modular segmentation allows the same basic reflective architecture to serve multiple spectral bands, achieving versatility without requiring separate complete microscope systems for each band.
3Productivity
If on-axis reflective optics are used, then alignment is simpler, but central obscuration and reduced light throughput occur
Solution Approach 1:
The patent transitions from symmetric on-axis optics to asymmetric off-axis optics. By positioning mirrors off the optical axis, the system eliminates central obscuration and improves light throughput to the detector. The asymmetric configuration, while requiring more careful alignment, enables unobstructed light paths and higher productivity in terms of photon collection efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides ultra-wide spectral imaging with co-localization of excitation and detection wavelengths, low GDD, and high light efficiency, overcoming limitations of traditional microscopes.
Implementation Method 1
an all-reflective off-axis optical system to provide light from a light source to a sample and back to a detector with substantially zero chromatic aberration, low group delay dispersion and no central obscuration
Data Source
AI summary
Devices, systems and methods related to all-reflective microscopes are described. The microscopes include an all-reflective off-axis optical system and is characterized with substantially zero chromatic aberration, low group delay dispersion and no central obscuration. One reflective microscope configuration includes a reflective objective subsection with at least three mirrors, where at least one mirror is off-axis and non-spherical. The reflective microscope also includes a reflective relay subsection with at least two minors having freeform surfaces and positioned to receive light from the reflective objective subsection. The reflective relay subsystem is configured to produce a magnification to allow coupling of light between two planes having differing beam sizes. The reflective microscope further includes an imaging subsection with at least one mirror having a freeform surface and positioned to receive light from the reflective relay subsection and to direct light received thereon in reflection in a direction of a sensor.