Acoustic Gradient Index Lens for High-Power Laser Beam Control
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Solution Overview
Problem
Current adaptive optical technologies, such as digital mirror arrays and spatial light modulators, face limitations in speed, energy throughput, and cost, making them unsuitable for high-energy/high-power laser processing and large-scale applications, where rapid control over beam properties is necessary.
Innovation Solution
A tunable acoustic gradient index of refraction (TAG) lens is introduced, which uses a piezoelectric element to create acoustic waves that modulate the refractive index of a fluid within a cavity, allowing for rapid and precise control of light beam properties by varying the refractive index in response to electrical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital mirror arrays or spatial light modulators are used for adaptive optical control, then beam property modulation is achieved, but the device cost and complexity increase significantly
Solution Approach 1:
The patent replaces complex mechanical adaptive optical systems (digital mirror arrays, spatial light modulators) with a simpler acoustic wave-based refractive index modulation system. Acoustic waves directly modulate the refractive index of the medium without requiring complex mechanical moving parts or electronic pixel arrays, thereby reducing device complexity while maintaining adaptability for beam control
Solution Approach 2:
The patent utilizes acoustic waves (sound pressure waves) to modulate the refractive index of the optical medium. By introducing acoustic energy into the medium, dynamic refractive index patterns are created that can steer and focus light beams, providing adaptive optical control through acoustic rather than mechanical means
2Adaptability or versatility
If traditional adaptive optical devices are used, then beam shaping is possible, but the switching speed is limited
Solution Approach 1:
The patent employs acoustic vibrations to dynamically modulate the refractive index of the optical medium. By driving the medium with acoustic waves at specific frequencies and amplitudes, rapid refractive index changes are achieved, enabling fast beam steering and focusing responses that overcome the inertia-limited speed of mechanical adaptive optics
Solution Approach 2:
The patent uses periodic acoustic waves to create time-varying refractive index patterns in the medium. By controlling the frequency and phase of the acoustic drive, the system can rapidly switch between different beam steering angles and focal positions, achieving high-speed adaptive optical control through periodic acoustic excitation
3Power
If high-power lasers are used for materials processing, then processing capability increases, but conventional adaptive elements cannot withstand the energy
Solution Approach 1:
The patent introduces an acoustic wave field as an intermediary between the high-power laser and the optical medium. The acoustic waves modulate the refractive index without being in direct contact with the high-power laser beam path, allowing the acoustic field to control the beam while remaining immune to laser-induced thermal damage, thus enabling high-power laser processing with reliable control
Solution Approach 2:
The patent changes the physical state or parameter of the optical medium by introducing acoustic waves that create dynamic refractive index variations. This parameter change (refractive index modulation) occurs without heating or damaging the medium, allowing the system to withstand high-power laser irradiation while maintaining adaptive optical control capability
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 TAG lens enables fast and efficient control of light beam properties, overcoming the limitations of existing technologies by providing a high-speed, cost-effective solution for dynamic focusing and imaging, and enhancing material processing capabilities.
Implementation Method 1
A tunable acoustic gradient index of refraction (TAG) lens is introduced, which uses a piezoelectric element to create acoustic waves that modulate the refractive index of a fluid within a cavity
Implementation Method 2
acoustic waves that modulate the refractive index of a fluid within a cavity, allowing for rapid and precise control of light beam properties by varying the refractive index in response to electrical signals
Implementation Method 3
tunable acoustic gradient index of refraction (TAG) lens... control of light beam properties by varying the refractive index
Data Source
AI summary
A tunable acoustic gradient index of refraction (TAG) lens and system are provided that permit, in one aspect, dynamic selection of the lens output, including dynamic focusing and imaging. The system may include a TAG lens and at least one of a source and a detector of electromagnetic radiation. A controller may be provided in electrical communication with the lens and at least one of the source and detector and may be configured to provide a driving signal to control the index of refraction and to provide a synchronizing signal to time at least one of the source and the detector relative to the driving signal. Thus, the controller is able to specify that the source irradiates the lens (or detector detects the lens output) when a desired refractive index distribution is present within the lens, e.g. when a desired lens output is present.