Articulated Laser Beam Transport for Stable Polarization Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current laser systems for dermatological applications face challenges in maintaining polarization of the laser beam within articulated arms, which affects the performance and longevity of non-linear crystals and handpieces, leading to reduced optical energy and increased complexity and costs.
Innovation Solution
A wavelength conversion system that maintains polarization using an articulated arm with mirrors having a phase shift of less than 10° between reflected components, converting circular polarization to linear polarization and allowing for efficient use of non-linear crystals, thereby ensuring consistent polarization independent of the arm's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional articulated arms with standard dielectric mirrors are used to transport the laser beam, then the system can deliver high peak power, but the polarization of the beam becomes unpredictable and dependent on arm position, making non-linear crystals unusable
Solution Approach 1:
The patent changes the critical parameter of mirror phase shift from conventional values to specifically less than 10°, which fundamentally alters how polarization evolves through the articulated arm. This parameter change ensures that the output polarization state remains predictable and controllable regardless of arm position, enabling reliable use of non-linear crystals for wavelength conversion
Solution Approach 2:
The patent introduces a polarization control element as an intermediary component within the articulated arm system. This element mediates between the unpredictable polarization changes caused by arm movement and the requirements of non-linear crystals, ensuring the beam maintains suitable polarization state for wavelength conversion throughout the arm's range of motion
2Adaptability or versatility
If multiple wavelengths are supported by adding new laser sources, then the system can treat more conditions, but the device dimensions, costs and complexity increase
Solution Approach 1:
The patent replaces the mechanical approach of adding multiple physical laser sources with an optical approach using non-linear crystal wavelength conversion. Instead of incorporating multiple independent laser systems, a single laser source combined with non-linear crystals generates multiple wavelengths through optical parametric oscillation, dramatically reducing system complexity while maintaining multi-wavelength capability
Solution Approach 2:
The patent makes a single laser source universal by enabling it to produce multiple wavelengths through non-linear wavelength conversion. The same laser beam, after passing through the polarization-maintaining articulated arm, can be converted to different wavelengths using different non-linear crystals, allowing one source to perform the function of multiple sources
3Adaptability or versatility
If dye handpieces are used for wavelength conversion, then multiple wavelengths can be generated, but the devices are subject to wear and must be replaced frequently
Solution Approach 1:
The patent replaces disposable dye-based handpieces with durable non-linear crystal-based handpieces. Non-linear crystals are solid-state materials that do not degrade through use like organic dyes, eliminating the need for frequent replacement while maintaining the ability to generate multiple wavelengths through optical parametric oscillation
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 solution enables the use of non-linear crystals without optical alignment, improves beam quality, and extends the lifespan of handpieces, maintaining high optical energy performance and reducing the need for frequent replacements.
Implementation Method 1
A wavelength conversion system comprising a transport system for a laser beam (201), said transport system comprising: an articulated arm (200) comprising a mirror (203) at each of its joints, positioned at 45° with respect to said laser beam; each of said mirrors (203) having a phase shift of less than 10° between the reflected components
Implementation Method 2
a non-linear converter (300) for converting the wavelength of said output laser beam
Data Source
AI summary
A wavelength conversion system comprising a transport system for a laser beam comprising: a circular polarization laser beam; an articulated arm comprising a mirror at each of its joints, arranged at 45° with respect to said laser beam; each of said mirrors having a phase shift between the reflected components of less than 10°; means for converting said laser beam from circular polarization to linear polarization and providing a linear polarization output laser beam; a non-linear converter for converting the wavelength of said output laser beam to linear polarization.