Acousto-Optic Fiber Laser Beam Switching for MHz Scanning
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Solution Overview
Problem
Existing fiber laser systems are limited in their ability to rapidly adjust laser beam characteristics, particularly in applications requiring high-speed scanning such as additive manufacturing, due to the slow response rates of motorized systems.
Innovation Solution
The implementation of an acoustically controlled laser system that uses an acoustic transmitter to generate acoustic waves, which interact with the laser beam within a graded-index optical fiber to rapidly deflect and split the beam between different guiding regions, enabling high-speed beam scanning and switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If motorized systems are used to adjust laser beam characteristics, then the system structure is simple and reliable, but the response speed is slow and cannot meet high-speed scanning requirements
Solution Approach 1:
The patent replaces motorized mechanical adjustment systems with an acousto-optic modulator that uses acoustic waves to diffract and deflect laser beams. This substitution of mechanical systems with acoustic-optical interactions enables response speeds exceeding 1 MHz while maintaining system controllability, directly resolving the contradiction between response speed and system complexity.
Solution Approach 2:
The patent changes the operating parameters by using acoustic frequency and intensity modulation instead of mechanical position control. The acousto-optic modulator responds to electrical signals that control acoustic wave properties, allowing rapid parameter changes in beam deflection angle and intensity without mechanical inertia limitations, thus achieving high-speed scanning capability.
2Power
If high power laser sources are used for power scaling, then the processing capability increases, but the energy consumption increases and lifetime decreases
Solution Approach 1:
The patent uses an acousto-optic modulator to split a single high-power laser beam into multiple diffracted orders (zeroth order, first order, etc.). This segmentation allows the high-power beam to be distributed to multiple output channels or processing zones, enabling parallel processing that improves overall system productivity while maintaining efficient energy utilization through the high efficiency of acousto-optic diffraction.
Solution Approach 2:
The acousto-optic modulator provides multi-functionality by simultaneously enabling beam deflection, beam splitting, and intensity modulation. A single device performs multiple functions that would otherwise require separate components, reducing total system energy consumption while maintaining high laser power delivery to various processing locations.
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
This approach allows for rapid adjustment of laser beam parameters at rates exceeding 1 MHz, enabling high-speed scanning and efficient power distribution, which is critical for applications like additive manufacturing.
Implementation Method 1
an acoustic transmitter to generate acoustic waves, which interact with the laser beam within a graded-index optical fiber to rapidly deflect and split the beam
Data Source
AI summary
An imaging optic includes a first end to receive laser light, an exterior, and a second end; an acoustic transmitter acoustically coupled to a first side of the exterior of the imaging optic; an acoustic absorber acoustically coupled to a second opposite side of the exterior of the imaging optic; a waveguide having a first end to receive an output from the second end of the imaging optic, a first core section, a second section, and a second end, wherein acoustic waves output from the acoustic transmitter are arranged to diffract a first order beam from the laser light in the imaging optic; wherein the first order light is selectively output from the second end of the imaging optic into one of the sections of the waveguide.