Frequency-Doubled Laser Telescope Module Crystal Positioning
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Solution Overview
Problem
Current high energy laser systems for copper welding face challenges due to low conversion efficiency and risk of nonlinear crystal damage, particularly in the visible spectrum, where beam quality and peak power density are suboptimal, and the precise positioning of nonlinear crystals is restrictive.
Innovation Solution
A frequency-doubled laser system incorporating a telescope module with adjustable focusing quantity, featuring a resonator design with a nonlinear crystal positioned flexibly, and a harmonic outputting mirror to enhance beam quality and reduce crystal damage risk, utilizing a plano-concave and plano-convex lens configuration to optimize frequency doubling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a lens is inserted into the resonator to improve fundamental frequency light power density in the nonlinear crystal, then the frequency doubling efficiency is improved, but the nonlinear crystal assembly position must be restricted to a very small range and the crystal is easily damaged
Solution Approach 1:
The patent employs a dynamic adjustment mechanism for the nonlinear crystal position, allowing continuous adjustment along the optical axis. This dynamic positioning capability enables optimization of the crystal location to achieve high frequency doubling efficiency while avoiding fixed position constraints that lead to crystal damage.
Solution Approach 2:
The patent introduces an intermediary adjustment structure between the resonator components and the nonlinear crystal. This intermediary mechanism provides precise position control and stabilization, allowing the crystal to be positioned optimally without direct mechanical constraints that could cause damage.
2Productivity
If a lens is inserted into the resonator to improve fundamental frequency light power density, then the frequency doubling efficiency is improved, but the risk of nonlinear crystal damage increases
Solution Approach 1:
The patent implements protective measures beforehand by designing a positioning system with large adjustment range and precise control. This allows optimal positioning to be achieved without excessive power density concentration, cushioning against the risk of crystal damage while maintaining high efficiency.
Solution Approach 2:
The patent changes the positioning parameter (crystal location along optical axis) over a wide range, allowing optimization of both efficiency and safety. By adjusting this parameter, the system achieves high frequency doubling efficiency while distributing power density to prevent crystal damage.
3Power
If conventional long pulse green light laser apparatus uses intracavity frequency doubling with a lens, then fundamental frequency light power density is improved, but the device complexity and positioning precision requirements increase
Solution Approach 1:
The patent segments the resonator into distinct functional zones with the nonlinear crystal positioned in a specific adjustmentable region. This segmentation allows independent optimization of each zone, achieving high power density without requiring complex integrated positioning mechanisms throughout the entire resonator.
Solution Approach 2:
The patent designs the resonator structure to serve multiple functions: generating fundamental frequency light, enabling frequency doubling, and providing adjustable positioning. This multi-functionality reduces overall device complexity by combining what would otherwise require separate systems.
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 configuration allows for flexible nonlinear crystal positioning, reduces damage risk, and enhances harmonic outputting efficiency by optimizing beam quality and focusing quantity, resulting in improved copper welding productivity and quality.
Implementation Method 1
a nonlinear crystal; the polarizing element, the gain medium, the telescope module, and the nonlinear crystal are located in the resonator
Implementation Method 2
a telescope module, a first cavity lens and a second cavity lens, the first cavity lens and the second cavity lens are spaced apart along a laser emitted from the gain medium
Implementation Method 3
the polarizing element is located between the first reflecting mirror and the telescope module, and the polarizing element is configured to convert a fundamental frequency laser outputted from the gain medium to a linearly polarized light
Implementation Method 4
a first reflecting mirror, a second reflecting mirror, the first reflecting mirror and the second reflecting mirror are spaced apart to form a resonator of the frequency-doubled laser
Data Source
AI summary
A frequency-doubled laser, including: a first reflecting mirror, a second reflecting mirror, a gain medium, a telescope module, a polarizing element, and a nonlinear crystal; the first reflecting mirror and the second reflecting mirror are spaced apart to form a resonator of the frequency-doubled laser; the polarizing element, the gain medium, the telescope module, and the nonlinear crystal are located in the resonator, and the telescope module is located between the gain medium and the nonlinear crystal. The present disclosure further provides a method of generating harmonic laser. The frequency-doubled laser and the method of generating harmonic laser make the position of nonlinear crystal more flexible, and the possibility of damage to the nonlinear crystal is reduced.