Coiled Gain Fiber Temperature Gradient Control to Mitigate SBS
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-power fiber amplifiers face challenges such as heat management and Stimulated Brillouin Scattering (SBS), which can lead to temperature control issues, compactness problems, and potential damage to system components.
Innovation Solution
A temperature controller for the gain fiber with a heat transfer structure and temperature sinks, utilizing different thermal conductivities in various sections to dissipate heat differently, mitigating SBS by creating temperature gradients along the fiber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid-cooled cold plates or thermoelectric coolers are used to cool the gain fiber, then heat control is improved, but device complexity and compactness are worsened
Solution Approach 1:
The patent combines the cooling function directly into the fiber structure by integrating temperature control sections within the fiber itself, eliminating the need for separate liquid-cooled cold plates or thermoelectric coolers. This merging of functions reduces device complexity while maintaining effective heat control.
Solution Approach 2:
The fiber amplifier is designed with self-cooling capability through integrated temperature control sections that actively manage heat dissipation within the fiber structure. This self-service approach eliminates external cooling systems, reducing both device complexity and improving compactness while maintaining effective temperature control.
2Productivity
If narrow-band laser light is propagated through passive fiber to maximize output power, then productivity is improved, but Stimulated Brillouin Scattering occurs causing harmful effects
Solution Approach 1:
The patent applies local quality by creating temperature control sections at specific locations along the fiber with different thermal conductivities. This localized temperature management modifies the local properties of the fiber to suppress SBS in critical regions while maintaining high output power overall, rather than uniformly treating the entire fiber.
Solution Approach 2:
The patent changes the temperature parameter along the fiber length by incorporating sections with different thermal conductivities. This parameter change (temperature variation) suppresses the SBS effect which is highly temperature-dependent, allowing higher output power to be achieved without triggering catastrophic SBS.
3Reliability
If global or local temperature control of gain fiber is implemented to suppress SBS, then reliability is improved, but device complexity and space efficiency are worsened
Solution Approach 1:
The patent segments the fiber into different sections with distinct thermal conductivity properties. This segmentation allows targeted temperature control in specific regions where SBS is most likely to occur, achieving reliable SBS suppression with minimal added complexity compared to uniform temperature control of the entire fiber.
Solution Approach 2:
The patent implements local quality by giving different sections of the fiber different thermal conductivities. This localized approach to temperature control achieves reliable SBS suppression only where needed, rather than controlling the entire fiber, thereby reducing device complexity and space requirements while maintaining reliability.
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 effectively reduces the onset of SBS, allowing for higher output power and increased robustness in high-power fiber laser systems by managing temperature distribution along the gain fiber.
Implementation Method 1
at least one first portion of the at least one temperature sink is disposed in first thermal conductivity with at least one first section of the heat transfer structure, and at least one second portion of the at least one temperature sink is disposed in second thermal conductivity with at least one second section of the heat transfer structure
Implementation Method 2
the at least one temperature sink is configured to dissipate heat
Data Source
AI summary
A temperature controller is used for a gain fiber of a fiber amplifier. The controller includes a heat transfer structure and one or more temperature sinks, such as cooling plates. The heat transfer structure supports the gain fiber and is disposed in thermal contact with it. Portions of the temperature sink(s) are disposed in different thermal conductivity with sections of the heat transfer structure. For example, the sinks may have different material properties and/or material thicknesses. Also, portions of the temperature sink(s) can have different cooling rates. The different thermal conductivities conduct the heat from parts of the gain fiber differently from one another. In the end, an onset of Stimulated Brillouin Scattering (SBS) on the laser light path can be mitigated by conducting heat from the gain fiber with the different thermal conductivities.