Doped Thermo-Optic Beam Shaping for High-Power Laser Control
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Solution Overview
Problem
Current optical beam shapers for high-power laser systems are limited by power constraints, expense, and inability to adjust shape, making it difficult to control beam profiles effectively, especially in applications requiring precise beam shaping.
Innovation Solution
A laser beam shaping system utilizing a doped medium with differential absorption characteristics at different wavelengths, where a lower power absorbed beam induces a thermo-optical phase change profile to transform the shape of a higher power beam, allowing for controlled beam shaping without power damage limits and at a lower cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional optical beam shapers are used for high-power laser systems, then beam shaping capability is provided, but power damage limits and expensive constraints arise
Solution Approach 1:
The patent converts the harmful thermal lensing effect, traditionally avoided in optical systems, into a beneficial mechanism for beam shaping. By intentionally introducing a doped medium that absorbs pump beam energy and creates controlled thermal lensing, the system shapes the transmitted beam profile without requiring expensive conventional beam shapers capable of withstanding high powers.
Solution Approach 2:
The patent changes the optical parameters of the medium by doping it with specific concentrations of rare earth ions (e.g., Nd³⁺, Yb³⁺, Tm³⁺) to achieve wavelength-selective absorption. This allows the medium to be transparent at the beam wavelength while absorbing at the pump wavelength, enabling thermal lensing-based beam shaping without damage limits.
2Adaptability or versatility
If conventional optical beam shapers are used, then beam shaping is achieved, but adjustability is limited once manufactured
Solution Approach 1:
The patent enables dynamic adjustment of beam shape by changing the pump beam parameters (power, profile, wavelength) that create the thermal lensing effect. The doped medium's refractive index profile can be dynamically modified through optical pumping, allowing real-time beam shaping adjustment without mechanical moving parts or complex adjustment mechanisms.
Solution Approach 2:
The thermal lensing effect in the doped medium is dynamically controllable through the pump beam. By adjusting pump power, wavelength, or spatial profile, the refractive index distribution in the medium changes dynamically, enabling real-time beam shaping adaptation without fixed mechanical structures.
3Shape
If thermal lensing is avoided in optical elements, then beam profile stability is maintained, but beam shaping capability is lost
Solution Approach 1:
The patent deliberately utilizes thermal lensing, traditionally considered a harmful effect, as the primary mechanism for beam shaping. The doped medium converts absorbed pump beam energy into controlled thermal lensing that shapes the transmitted beam profile, transforming a previously avoided effect into the core functional mechanism.
Solution Approach 2:
The doped medium acts as an intermediary that converts pump beam energy at one wavelength into thermal lensing effects that shape the transmitted beam at a different wavelength. The medium mediates between the pump beam and the beam to be shaped, enabling controlled beam shaping through thermal-optic interactions.
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
Enables flexible and cost-effective shaping of high-power laser beams by using a doped medium to create a thermo-optical phase change profile, allowing for precise control of beam shape and size, enhancing performance in applications like additive manufacturing and directed energy systems.
Implementation Method 1
the doped medium has a higher beam absorption characteristic at the second wavelength than at the first wavelength, causing the absorbed beam to have a higher absorption than the shaped beam in the doped medium
Implementation Method 2
The Applicant wishes to use the broader concept of thermo-optic phase change profiles, of which thermal lensing is but one example, in an intentional manner to transform, control or realise a thermo-optic phase transformation profile inside a specially doped and coated medium to control the phase of a transmitted laser beam
Data Source
AI summary
A laser beam shaping system includes at least one doped medium which is doped with a dopant and which is optically transparent at the first wavelength range and a beam input or coupling configured to generate or receive a shaped beam that is required to be shaped, the shaped beam being at a first wavelength range and directed towards the doped medium. The system includes an absorbed beam input or coupling configured to generate or receive at least one absorbed beam at a second wavelength range which is different from the first wavelength range and which is directed towards the doped medium. The doped medium has a higher beam absorption characteristic at the second wavelength range than at the first wavelength range, causing the absorbed beam to have a higher absorption than the shaped beam in the doped medium. The doped medium has a coating which allows high transmission of both the first and the second wavelength ranges.