Rotating Pyramid Prism for Laser Beam Stabilization
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Solution Overview
Problem
Existing adaptive optics systems for stabilizing intense laser beams in atmospheric conditions are complex, expensive, and have slow response times, which makes them ineffective in addressing small-scale, fast-response phase aberrations caused by atmospheric turbulence and coolant turbulence in high-energy laser systems.
Innovation Solution
A beam optical axis self-stabilizing device based on reflection mechanical modulation, comprising a polarized beam splitter, a quarter-wave plate, a structural reflecting element, and a driving source, which rotates the structural reflecting element to modulate the phase of the reflected light, ensuring consistent phase delays across the beam aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adaptive optics technologies are used to compensate for wavefront aberration, then beam quality and focal spot stability are improved, but device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent replaces the complex adaptive optics mechanical system with a simple rotating pyramid prism. Instead of using deformable mirrors and wavefront sensors that require complex control mechanisms, the invention uses a purely mechanical rotation of the pyramid prism at high speed to achieve beam stabilization, dramatically simplifying the system while maintaining effectiveness
Solution Approach 2:
The patent changes the operational parameter from slow adaptive optics adjustment (milliseconds) to high-speed mechanical rotation of the pyramid prism. This parameter change enables the system to respond to fast-response phase aberrations that adaptive optics cannot address, while the simple rotational mechanism keeps the device complexity low
2Stability of the object's composition
If adaptive optics systems are used to correct atmospheric turbulence, then beam directivity is improved, but response time becomes too slow for fast-response phase aberrations
Solution Approach 1:
The patent introduces dynamic high-speed rotation of the pyramid prism to address fast-response phase aberrations. The continuous rotational motion creates an effective averaging of phase errors across the beam aperture, providing stabilization for both slow atmospheric turbulence and fast coolant-induced aberrations that static or slowly-responding systems cannot correct
Solution Approach 2:
The pyramid prism rotates periodically at high speed, creating time-varying phase modulation that effectively averages out fast-response phase aberrations. This periodic mechanical action occurs at frequencies much higher than the aberration timescales, enabling correction of rapid beam quality degradation that adaptive optics with millisecond response cannot address
3Manufacturing precision
If adaptive optics systems are deployed in high-energy laser systems, then focal spot stability is improved, but manufacturing and maintenance costs increase
Solution Approach 1:
The patent employs a simple pyramid prism that can be manufactured at low cost compared to expensive deformable mirrors and wavefront sensors. The prism is a passive optical element with no active control components, making it inexpensive to manufacture and replace if needed, thereby reducing both initial manufacturing cost and long-term maintenance expenses while achieving the same focal spot stability
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 device achieves stable focal spot centroid, consistent beam directivity, higher focusable power, and energy concentration ratio, effectively overcoming atmospheric and coolant-induced aberrations with a simpler and potentially more cost-effective solution compared to traditional adaptive optics systems.
Implementation Method 1
a quarter-wave plate...the reflected light is modulated by the quarter-wave plate
Implementation Method 2
The incident light passes through the polarized beam splitter to obtain split light
Implementation Method 3
the structural reflecting element rotates so that the phase of reflected light varies with time
Data Source
AI summary
The invention provides a beam optical axis self-stabilizing device and method based on reflection mechanical modulation. The device includes a polarized beam splitter, a quarter-wave plate, a structural reflecting element, and a driving source. The quarter-wave plate is located at an output end of the polarized beam splitter. The reflecting element is located at a side of the quarter-wave plate away from the polarized beam splitter. The driving source drives the structural reflecting element to rotate at a uniform speed with an optical axis as an axis. Incident light passes through the polarized beam splitter to obtain split light. The split light passes through the quarter-wave plate to enter the structural reflecting element. The structural reflecting element rotates so that the phase of reflected light varies with time. The reflected light is modulated by the quarter-wave plate and emitted through the polarized beam splitter, and a target beam is obtained.