Eye Therapy Laser System Chromatic Aberration Compensation
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Solution Overview
Problem
Conventional systems for eye therapy using laser radiation face challenges in correcting longitudinal and transverse chromatic aberrations across multiple wavelengths, particularly when operating at significantly different centroid wavelengths, which affects the focus quality and nonlinear interaction within tissue.
Innovation Solution
A system configured to operate at two centroid wavelengths with a focusing device and scanner control system that compensates for chromatic aberrations through adaptive deflection and refocusing, allowing for precise control of the focal position and size, eliminating the need for complex achromatization and reducing residual aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional systems operate at multiple significantly different centroid wavelengths, then versatility in treatment options is improved, but chromatic aberration correction complexity increases
Solution Approach 1:
The system changes the parameter of focus position (depth and lateral position) dynamically to compensate for chromatic aberrations. By adjusting the focus position based on the specific wavelength being used, the system maintains optimal focus quality across a wide wavelength range without requiring complex optical correction elements for each wavelength.
Solution Approach 2:
The system employs dynamic adjustment of the focus position through scanner devices that can rapidly reposition the focal point. This dynamic capability allows the system to adapt to different wavelengths in real-time, compensating for chromatic aberrations on the fly rather than requiring static optical corrections for each wavelength.
2Manufacturing precision
If short-pulse laser radiation is focused onto a tight focus for nonlinear interaction, then treatment precision is improved, but chromatic aberration sensitivity increases
Solution Approach 1:
The system incorporates feedback mechanisms where the control device monitors the wavelength being used and automatically adjusts the focus position accordingly. This feedback loop compensates for chromatic aberrations by positioning the focus at the optimal depth and lateral location for each specific wavelength, maintaining tight focus quality for nonlinear interactions.
Solution Approach 2:
The system performs preliminary calculation and positioning of the focus based on the known wavelength and its associated chromatic aberration characteristics. Before delivering the laser pulse, the system pre-positions the focus at the correct location to account for expected chromatic shifts, ensuring optimal focus quality when the pulse is delivered.
3Reliability
If complex achromatization systems are implemented for multiple wavelengths, then chromatic aberration correction is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The system extracts and removes the need for complex achromatization optical elements by using a different approach - dynamic focus positioning based on wavelength. Instead of adding complex optical correction components for each wavelength, the system takes out the requirement for these elements entirely by compensating through scanner-controlled focus adjustment.
Solution Approach 2:
The scanner devices act as intermediaries between the laser source and the tissue target. Rather than using complex optical elements to correct chromatic aberrations, the scanner serves as a mediating component that repositions the focus to compensate for wavelength-dependent aberrations, simplifying the overall optical system.
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 system ensures consistent focus quality and nonlinear interaction across a wide wavelength range, enabling effective tissue treatment and observation without the need for extensive optical corrections, thus simplifying the setup and maintenance.
Implementation Method 1
treating tissue by means of nonlinear interaction with therapy or measurement radiation
Implementation Method 2
focuses the therapy radiation onto a focus in the image field such that the treatment or measurement is producible within the tissue by means of nonlinear interaction
Implementation Method 3
an xy-scanner device, disposed upstream of the focusing device, for lateral displacement of the focus in the image field
Implementation Method 4
a z-scanner device, which adjusts a depth position of the focus in the therapy volume
Implementation Method 5
A system configured to operate at two centroid wavelengths with a focusing device and scanner control system that compensates for chromatic aberrations through adaptive deflection and refocusing
Data Source
AI summary
A system for therapy of the eye by treating tissue with therapeutic radiation using nonlinear interaction. A laser device is provided, which delivers the therapeutic radiation. The therapeutic radiation is focussed by a focussing device in an image field, and xy scanners and z scanners shift the focus laterally and longitudinally within a treatment volume. The therapeutic radiation is either a second short pulse radiation or a first short pulse radiation, each of which have a spectral centroid within a wavelength range defined by the short pulse properties. The system is particularly corrected with regard to longitudinal chromatic aberrations and lateral chromatic aberrations such that the spectral characteristic curves of the two aberrations each have a local extreme within the wavelength ranges, and a certain tolerance within the wavelength ranges is not exceeded, therefore the characteristic curves are very shallow.