Piezoelectric DBR Mirror for High-Power Laser Beam Extraction
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Solution Overview
Problem
Current laser systems face limitations in handling high-power laser beams due to the intensity limits of solid-state optics, which are close to the ionization threshold of most materials, limiting the achievable intensity to approximately 1012 W/cm2, and conventional acousto-optic modulators provide insufficient refractive index contrast for significant reflective spectrum shifts.
Innovation Solution
A hybrid distributed Bragg reflector (DBR) mirror system with a piezoelectric layer containing voids is used to alter the reflective spectrum by introducing surface acoustic waves (SAWs) or bulk acoustic waves (BAWs), achieving a refractive index contrast greater than 0.001, allowing efficient extraction of high-power laser beams through one of the DBR mirrors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional solid-state optics are used to handle high-power laser beams, then the laser intensity can reach approximately 10^12 W/cm², but the intensity limit approaches the ionization threshold of materials, limiting further intensity increase
Solution Approach 1:
The patent introduces an optical cavity with DBR mirrors as an intermediary system to build up laser intensity through multiple passes and resonant enhancement, rather than relying on single-pass optics. The cavity acts as a mediator that allows gradual intensity buildup while maintaining material stability through distributed reflection.
Solution Approach 2:
The patent employs periodic action by having the laser beam undergo multiple round trips within the optical cavity, with each pass contributing to intensity buildup. The DBR mirrors provide periodic reflection, and the piezoelectric actuator applies periodic modulation to control the cavity resonance conditions, enabling sustained high-intensity operation without exceeding material thresholds in any single component.
2Measurement precision
If conventional acousto-optic modulators are used to control laser beams, then the refractive index contrast is insufficient, but the system complexity increases when using alternative methods
Solution Approach 1:
The patent merges the DBR mirror structure with a piezoelectric actuator layer to create an integrated cavity control system. The piezoelectric layer is deposited directly on the DBR mirror, combining the optical reflection function with the acoustic wave generation function in a single integrated component, thereby achieving high refractive index contrast without increasing overall system complexity.
Solution Approach 2:
The patent changes the physical state and properties of the piezoelectric material by applying electrical voltage, which induces acoustic waves that dynamically modulate the refractive index of the DBR mirror structure. This parameter change approach allows precise control of laser beam extraction with high refractive index contrast, achieving effective modulation without complex mechanical or optical systems.
3Productivity
If DBR mirror area is increased to handle higher energy levels, then the laser beam extraction efficiency improves, but the device area and complexity increase
Solution Approach 1:
The patent introduces dynamic control of the DBR mirror properties through the piezoelectric actuator, which can rapidly modulate the mirror's reflectivity and resonance characteristics. This dynamic capability allows the system to achieve high extraction efficiency on demand without requiring permanently large mirror areas, as the enhanced performance is achieved through temporal modulation rather than static size increase.
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 enables the handling of higher energy levels by increasing mirror area, overcoming the limitations of conventional DBR systems and facilitating the efficient extraction and control of high-power laser beams, suitable for applications like nuclear fusion and other high-power laser applications.
Implementation Method 1
A hybrid distributed Bragg reflector (DBR) mirror system with a piezoelectric layer containing voids is used to alter the reflective spectrum by introducing surface acoustic waves (SAWs) or bulk acoustic waves (BAWs)
Implementation Method 2
introducing surface acoustic waves (SAWs) or bulk acoustic waves (BAWs), achieving a refractive index contrast greater than 0.001, allowing efficient extraction of high-power laser beams
Data Source
AI summary
In an example, the present invention provides a laser system. The laser system has a source laser (e.g., CBC) coupled to first mirror device opposing a second mirror device and configured to generate a resonating laser beam between the first mirror and the second mirror. In an example, the system has a piezoelectric device configured to the second mirror device and characterized by a refractive e index such that one or more voids is changed by applying an energy to the piezo electric device to cause a change in a value of the refractive index, e.g., by more than 0.0001, to allow the resonating laser beam or a portion of the resonating laser to traverse through a portion of the second mirror device.