Anamorphic Prism System for Polarized Laser Beam Shaping
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Solution Overview
Problem
Conventional anamorphic optical systems for diode lasers fail to produce a highly polarized circular beam, leading to beam quality issues such as elliptical beam shape and inadequate polarization ratios, which are essential for various applications like CD drives and laser printers.
Innovation Solution
A frequency converted laser system incorporating a waveguide with nonlinear material and an anamorphic optical system comprising prisms with polarization selective coatings, transforming the elliptical beam into a highly polarized circular beam by reflecting the s-polarization component and transmitting the p-polarization component, achieving a polarization ratio of 100:1 or higher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional anamorphic optical systems are used to transform elliptical beams, then beam shape is improved, but polarization ratio remains insufficient
Solution Approach 1:
The patent combines the anamorphic beam shaping function with the polarization function into a single integrated optical system. The anamorphic prism pair is equipped with polarization-selective coatings that simultaneously perform beam transformation and polarization enhancement, eliminating the need for separate polarization elements and achieving both shape correction and high polarization ratio (exceeding 500:1) in one system.
Solution Approach 2:
The patent applies polarization-selective coatings with specific optical parameters to the anamorphic prism surfaces. These coatings are designed with particular reflectivity and transmissivity characteristics for different polarization states, enabling the system to achieve high polarization ratios while maintaining the anamorphic beam transformation function.
2Manufacturing precision
If additional polarizing elements are added to achieve polarization, then polarization ratio is improved, but beam alignment and power loss worsen
Solution Approach 1:
The patent integrates polarization functionality directly into the anamorphic optical system by applying polarization-selective coatings to the prism surfaces. This merging eliminates the need for separate polarizing elements, thereby reducing the number of alignment steps and minimizing beam alignment complexity while achieving the required polarization ratio.
Solution Approach 2:
The patent extracts the polarization function from separate polarizing elements and incorporates it directly into the anamorphic prism system through coatings. This extraction and integration approach removes unnecessary intermediate components that would otherwise require alignment, simplifying the overall system while maintaining high polarization performance.
3Manufacturing precision
If additional polarizing elements are added to achieve polarization, then polarization ratio is improved, but power loss increases
Solution Approach 1:
The patent combines polarization enhancement with the existing anamorphic beam transformation path, eliminating the need for additional separate polarizing elements. This integration reduces the total number of optical interfaces and minimizes cumulative power loss while achieving the required polarization ratio through optimized coatings on the prism surfaces.
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 system effectively transforms elliptical beams into highly polarized circular beams, enhancing beam quality and meeting the polarization requirements of various applications, while reducing the need for additional polarizing elements that cause power loss and alignment issues.
Implementation Method 1
at least one of said input or exit surfaces of the first or second prisms is coated with a polarization selective coating
Implementation Method 2
the input surface of at least one of the first prism and the second prism are positioned such that an angle of incidence of the input laser beam is within a range of about plus or minus two degrees of Brewster's angle
Implementation Method 3
a waveguide comprising at least one nonlinear material, said waveguide being configured to receive an input laser beam of a first frequency and emit a non-circular shaped laser beam having a second frequency
Implementation Method 4
a first prism and a second prism configured to provide an anamorphic change to the shape of the input beam
Data Source
AI summary
Apparatus and methods are disclosed for transforming a laser beam to a polarized shaped beam in, for example, a frequency converted laser system. In one embodiment, an anamorphic optical system includes a first prism and a second prism that can be configured to form a Brewster telescope, the first prism and second prism each having an input surface and an exit surface, and wherein at least one surface of the input or exit surfaces are coated with a polarization selective coating. The optical system can include an adjustment system configured to change the position of one or both of the first prism and the second prism to adjust the transformation of the shape of the laser beam. In some embodiments of the optical system, a configuration of the first prism, the second prism, and the polarization selective coating produce a laser beam having a polarization ratio of about 100:1 or higher.