Multi-Wavelength Laser Output Control for Stable Beam Shape
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing laser apparatuses face challenges in maintaining consistent beam shape and efficiency when converting laser beams of different wavelengths for various medical treatments, particularly due to difficulties in controlling pulse width and output energy.
Innovation Solution
A laser apparatus is designed with a secondary harmonic wave generator, a light modulator, and an output adjustor to generate and adjust laser beams of multiple wavelengths, utilizing a non-linear medium and phase delayer to control beam quality and output, allowing for selective wavelength selection based on treatment needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a laser beam of long wavelength is converted to short wavelength through secondary harmonic generation, then a short wavelength laser beam is generated, but the beam shape becomes difficult to maintain constant
Solution Approach 1:
The patent applies preliminary action by adjusting the pulse width of the fundamental laser beam before it enters the nonlinear optical crystal. The light modulator pre-adjusts the pulse width parameters of the 1064nm laser beam to optimize the secondary harmonic generation process, ensuring that the generated 532nm beam maintains consistent shape and quality throughout operation.
2Productivity
If the pulse width of the fundamental laser beam is adjusted to optimize short wavelength generation, then the output form varies, but it becomes difficult to maintain constant beam shape
Solution Approach 1:
The patent implements feedback control through the output adjustor, which includes a phase delayer and polarizer. These components monitor and adjust the beam parameters in real-time based on the pulse width adjustments made to the fundamental beam, providing feedback control that maintains stable beam shape and consistent output quality despite variations in pulse width settings.
3Adaptability or versatility
If a multi-wavelength laser beam is output through wavelength conversion, then various treatment targets can be addressed, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing an optical system that can output multiple wavelengths (1064nm and 532nm) through a single integrated apparatus. The wavelength converter and output adjustor enable the system to provide both fundamental and harmonic wavelengths, allowing one device to serve multiple treatment purposes and reducing the need for separate laser 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
The apparatus achieves stable, high-quality laser beams of varying wavelengths with precise pulse widths and energies, suitable for both superficial and deep tissue treatments, enhancing treatment efficacy and versatility.
Implementation Method 1
a secondary harmonic wave generator configured to generate a laser beam of a second wavelength from the laser beam of a first wavelength
Implementation Method 2
The phase delayer may include an element that adjusts a degree of a phase delay of incident light, by being rotated according to an input signal
Data Source
AI summary
Disclosed is a laser apparatus including a laser generator comprising a laser medium, a pumping light source providing light to the laser medium, a first mirror and a second mirror arranged with the laser medium therebetween, and configured to generate a laser beam of a first wavelength, a secondary harmonic wave generator configured to generate a laser beam of a second wavelength from the laser beam of a first wavelength, a light modulator arranged between the laser medium and the secondary harmonic wave generator and configured to adjust a pulse width of the laser beam of a first wavelength, and an output adjustor configured to adjust an output of the laser beam of a second wavelength generated in the secondary harmonic wave generator.