Mono-crystalline Optical Guide for High Power Laser Thermal Management
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Solution Overview
Problem
Existing laser technologies face inefficiencies in energy conversion, leading to heat generation and material deformation, and suffer from non-linear effects due to imperfect material properties, compromising the quality of the emitted radiation.
Innovation Solution
The use of a mono-crystalline optical guide with a doped core and undoped peripheral sheath, where the pump wave is guided to maintain high power density and reduce heating, allowing for efficient stimulated emission with minimal wavefront deformation and non-linear effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional laser media are used, then energy conversion efficiency is improved, but heat generation and material deformation occur
Solution Approach 1:
The laser medium is segmented into multiple gain sections separated by isolators, allowing the pump power to be distributed across multiple stages. This segmentation prevents excessive heat concentration in a single medium, reducing thermal deformation while maintaining high energy conversion efficiency through cascaded amplification.
Solution Approach 2:
Optical isolators are introduced as intermediary components between gain sections to prevent back-reflections and enable unidirectional pump power transmission. This allows efficient energy conversion while managing thermal loads through controlled power distribution across multiple stages.
2Power
If high pump power is used, then laser output power is improved, but non-linear effects and material damage increase
Solution Approach 1:
The amplification process is divided into multiple gain sections with progressively increasing pump powers. This segmentation allows the system to achieve high output power while keeping the pump power density in each individual section below the threshold for non-linear effects and material damage.
Solution Approach 2:
The signal is pre-amplified in early gain sections with lower pump powers before entering subsequent sections with higher pump powers. This preliminary action reduces the required pump power density in later stages, preventing non-linear effects while achieving the desired high output power.
3Stability of the object's composition
If continuous wave pumping is used, then steady state operation is achieved, but thermal effects accumulate
Solution Approach 1:
The system uses pulsed pumping with duty cycles less than 10%, creating periodic excitation rather than continuous wave operation. This periodic action allows the medium to cool between pulses, preventing thermal accumulation while maintaining stable operational characteristics through consistent pulse timing and duration.
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 configuration enables the production of high power lasers with reduced thermal effects and improved radiation quality by maintaining high pump power density over longer lengths, limiting heating and non-linear effects, and allowing for the use of less doped materials.
Implementation Method 1
produce by stimulated emission an optical signal under the effect of optical pumping by a pump wave, the stimulated emission coming from active elements of the guide having been excited by the pump wave
Implementation Method 2
produce by stimulated emission an optical signal under the effect of optical pumping
Implementation Method 3
an undoped peripheral sheath allowing the guiding and confinement of the pump wave in the whole of its volume
Data Source
Figure 1~4
Figure 5~7
AI summary
The invention concerns a device with an elongated optical guide (1) and pumping means, for producing by stimulated emission an optical signal (4) under the effect of an optical pumping by a pump wave (6), the stimulated emission from the active elements of the guide having been excited by the pump wave. The invention is characterized in that the single-crystal guide having a core (3) doped with active elements and a non-doped peripheral cladding (2) enables the pump wave to be guided and confined in its entire volume, the optical signal (4) produced in the core being freely propagated (8),the optical indices of the core and the cladding being sufficiently close to avoid guiding in the doped core. In an implementation mode, the guide has a shorter length than the length of an optical signal Raleygh length in the guide. The device can be implemented in impulse optical amplifiers or laser oscillators.