ANDi Fiber Supercontinuum Conversion for UV and Mid-IR Coverage
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Solution Overview
Problem
Existing all-normal dispersion (ANDi) supercontinuum (SC) sources face limitations in extending their spectral coverage into the ultraviolet (UV) and mid-infrared (mid-IR) regions, with current methods either being unverified or prone to damage solid core fibers when exposed to UV light.
Innovation Solution
An ANDi-based SC system with a frequency-conversion element placed after the ANDi-fiber, utilizing a short non-linear crystal for efficient conversion of a broad SC spectrum into the UV or IR domain, avoiding direct UV exposure to the fiber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a frequency conversion element is placed before the ANDi-fiber to generate UV light, then UV supercontinuum generation is enabled, but the solid core fiber is damaged by direct UV exposure
Solution Approach 1:
The patent introduces an intermediary approach by placing the frequency conversion element (nonlinear crystal) after the ANDi-fiber rather than before. The ANDi-fiber generates a supercontinuum spectrum in the visible/near-IR range, and then the frequency conversion element converts specific portions of this spectrum to UV wavelengths. This mediates between the need for UV generation and the protection of the fiber from UV damage.
Solution Approach 2:
The patent inverts the conventional approach by reversing the order of components. Instead of converting pump light to UV before the fiber (which damages the fiber), it generates a broad supercontinuum spectrum first, then performs frequency conversion afterward. This inversion solves the contradiction by achieving UV generation without exposing the fiber to damaging UV wavelengths.
2Productivity
If phase matching is used for frequency conversion, then conversion efficiency is improved, but the system complexity increases due to complex phase matching requirements
Solution Approach 1:
The patent utilizes parameter changes by exploiting the broad spectral bandwidth of the ANDi-generated supercontinuum. Instead of requiring precise phase matching for a single wavelength, the system accepts a wide range of wavelengths from the supercontinuum source, allowing frequency conversion across multiple spectral regions simultaneously. This reduces the stringency of phase matching requirements while maintaining overall conversion efficiency.
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
Efficient generation of ANDi-SC in the UV and IR domains without damaging the fiber, achieving high conversion efficiency and broad bandwidth without the need for complex phase matching.
Implementation Method 1
SC generation in all-normal dispersion (ANDi) fibers develops from self-phase modulation (SPM) and optical wave breaking (OWB)
Implementation Method 2
SC generation in all-normal dispersion (ANDi) fibers develops from self-phase modulation (SPM) and optical wave breaking (OWB)
Implementation Method 3
a frequency-conversion-element configured to convert the supercontinuum-spectrum into a second frequency-domain
Data Source
Figure 1
AI summary
Disclosed is an all-normal-dispersion (ANDi)-based supercontinuum (SC) system, comprising a pulsed light-source configured to generate a train of light-pulses; an all-normal-dispersion (ANDi)-fiber optically coupled to the pulsed light-source and configured to generate a first supercontinuum-spectrum from the train of light-pulses, wherein the supercontinuum-spectrum is defined in a first frequency-domain; and a frequency-conversion-element configured to convert the supercontinuum-spectrum into a second frequency-domain, whereby the first supercontinuum-spectrum is converted to a second supercontinuum-spectrum.