Wavelength Conversion Crystal Cooling for ArF Laser Efficiency
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Solution Overview
Problem
Conventional ArF excimer laser systems for semiconductor lithography face inefficiencies in wavelength conversion and thermal management, leading to reduced performance and lifespan of nonlinear optical crystals used in wavelength conversion devices.
Innovation Solution
Incorporation of a cooling mechanism on at least one surface of the nonlinear optical crystal, such as a KBBF crystal, to enhance thermal management, combined with specific cooling systems like air-cooling, liquid-cooling, high-reflective films, and high-heat thermal conductive films, to improve wavelength conversion efficiency and extend crystal lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wavelength conversion element (nonlinear optical crystal) is used to convert laser beam wavelength, then wavelength conversion efficiency is improved, but thermal issues arise leading to reduced performance and lifespan
Solution Approach 1:
A cooling mechanism is introduced as an intermediary component between the wavelength conversion element and the environment. The cooling mechanism includes a cooling plate positioned adjacent to the crystal and a cooling medium flowing through channels in the cooling plate, serving as a mediator to transfer heat away from the crystal while maintaining optical functionality.
Solution Approach 2:
The patent changes the thermal parameters of the system by introducing active cooling. The cooling mechanism maintains the crystal at a controlled temperature, preventing thermal degradation and allowing the wavelength conversion element to operate at optimal temperature conditions for sustained high efficiency.
2Power
If high power laser beams are used for amplification, then output power is improved, but thermal damage to nonlinear optical crystals increases reducing lifespan
Solution Approach 1:
The cooling mechanism acts as a protective intermediary between the high power laser beam and the crystal. By positioning the cooling plate adjacent to the crystal and circulating cooling medium through it, the system mediates the thermal stress caused by high power operation, protecting the crystal from thermal damage while enabling sustained high power output.
Solution Approach 2:
The cooling mechanism provides beforehand cushioning by preemptively removing heat before it can accumulate to damaging levels. The cooling channels are designed to intercept and remove thermal energy generated during high power operation, cushioning the crystal against thermal shock and preventing catastrophic failure.
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 cooling mechanisms effectively manage thermal issues, enhancing the wavelength conversion efficiency and extending the lifespan of nonlinear optical crystals, thereby improving the overall performance of ArF excimer laser systems.
Implementation Method 1
a cooling mechanism that cools the wavelength conversion element from at least one surface of the wavelength conversion element
Implementation Method 2
specific cooling systems like air-cooling, liquid-cooling
Implementation Method 3
a wavelength conversion element that converts an entering first laser beam into a second laser beam by wavelength conversion
Data Source
AI summary
A wavelength conversion device may include a wavelength conversion element that converts an entering first laser beam into a second laser beam by wavelength conversion, and a cooling mechanism that cools the wavelength conversion element from at least one surface of the wavelength conversion element.