Laser Device Dispersive Medium Phase Control
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Solution Overview
Problem
Laser beam technology faces challenges in achieving high spatial beam quality due to the deterioration of wavelength-conversion crystals under thermal stress, making it difficult to apply wavelength conversion technology in applications like semiconductor lithography and short-wavelength processing.
Innovation Solution
A laser device with a light source and a nonlinear optical medium, including transparent dispersive media, is used to manipulate the relative phase relationship among laser beams, allowing for efficient wavelength conversion without relying on wavelength-conversion crystals, by adjusting the effective thickness and position of the dispersive media in the laser beam's propagation direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If wavelength conversion technology is applied to high output laser beams, then short wavelength laser beams can be generated, but the wavelength-conversion crystal deteriorates and becomes damaged due to thermal stress
Solution Approach 1:
The patent introduces a dispersive medium as an intermediary component between the laser beam and the wavelength conversion process. This dispersive medium manipulates the relative phase relationship among laser beams of different frequencies, enabling efficient wavelength conversion while reducing thermal stress on the conversion crystal, thus extending its lifespan
Solution Approach 2:
The patent changes the phase relationship parameter of laser beams by introducing a dispersive medium with specific effective thickness. This parameter change optimizes the nonlinear optical process, allowing efficient wavelength conversion at high power levels without causing thermal damage to the crystal
2Power
If direct oscillation from laser source is used, then high intensity and short wavelength can be obtained, but spatial beam quality deteriorates
Solution Approach 1:
The dispersive medium acts as an intermediary that improves spatial beam quality by manipulating phase relationships among frequency components. This allows the system to maintain high intensity while achieving better beam quality through optimized nonlinear optical processes
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 generation of laser beams with high output and improved beam quality over long and short wavelengths, extending the lifespan of the device and facilitating precise optical processes without the limitations of thermal stress on crystals.
Implementation Method 1
The nonlinear optical medium drives a nonlinear optical process including generation of laser beams having different frequencies
Implementation Method 2
The at least one dispersive medium has an effective thickness that causes a relative phase relationship among all the laser beams relevant to the nonlinear optical process to approximately satisfy a predetermined value
Data Source
AI summary
A laser device includes a light source that radiates a laser beam having one or more frequencies, and a nonlinear optical medium on which the laser beam is incident, the non-linear optical medium including at least one dispersive medium that is transparent and arranged along a direction in which the laser beam is radiated. The nonlinear optical medium drives a nonlinear optical process including generation of laser beams having different frequencies. The at least one dispersive medium has an effective thickness that causes a relative phase relationship among all the laser beams relevant to the nonlinear optical process to approximately satisfy a predetermined value.