Supercontinuum Generator Fiber High Power Beam Quality
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Solution Overview
Problem
Existing super continuum light sources face limitations in achieving high optical power and beam quality due to small core sizes and damage thresholds, which restrict the acceptance of high optical power and limit their applications in various spectroscopic and imaging technologies.
Innovation Solution
A super continuum light source with a generator fibre having a core diameter of at least 10 μm and a pump source providing optical peak power greater than 100 W, utilizing stimulated Raman scattering modal cleaning and operating below the zero dispersion wavelength to maintain beam quality and achieve high spectral density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a small core size fibre is used for super continuum generation, then the nonlinear effects are enhanced, but the damage threshold and acceptance of high optical power are limited
Solution Approach 1:
The patent changes the core diameter parameter from conventional small sizes (typically <10 μm) to a larger size of at least 10 μm. This parameter change allows the fibre to accept high optical power (P≥100 W) without reaching breakdown limits, while still maintaining the necessary nonlinear effects for super continuum generation through careful control of other parameters such as pump pulse duration and spectral width.
2Power
If a large core diameter fibre is used, then the acceptance of high optical power is improved, but the beam quality and spectral density may deteriorate
Solution Approach 1:
The patent employs periodic pulsed pumping with carefully controlled pulse durations (pico- or nanosecond range) to generate super continuum in the large core fibre. This periodic action allows the fibre to handle high average power while the pulse structure maintains the nonlinear interactions necessary for good beam quality and spectral density in the generated super continuum.
Solution Approach 2:
In addition to changing core diameter, the patent optimizes multiple parameters including pump pulse duration, spectral width, and timing to ensure that large core fibres produce super continuum with maintained beam quality. These coordinated parameter changes allow simultaneous achievement of high power acceptance and good output quality.
3Productivity
If femto-second pulses are used for super continuum generation, then the spectral broadening is enhanced, but the complexity of the system increases
Solution Approach 1:
The patent replaces complex femto-second pulse generation systems with simpler pico- or nanosecond pulse sources. While femto-second pulses provide excellent spectral broadening, the patent demonstrates that simpler, more robust pulse sources can achieve practical super continuum generation with adequate spectral coverage, reducing system complexity and cost.
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 solution enables the generation of high-power super continuum with improved beam quality, allowing for wider spectral coverage and increased utility in applications such as hyperspectral imaging and LIDAR systems by maintaining low M2 values and high spectral density over a broad range of wavelengths.
Implementation Method 1
utilizing stimulated Raman scattering modal cleaning
Implementation Method 2
Super continuum (SC) generation is a nonlinear phenomenon characterised by dramatic spectral broadening of intense light passing through a nonlinear material
Data Source
AI summary
A tunable light includes a super continuum light source and a non-linear crystal, the super continuum light source comprising a pump source and a generator fiber, the generator fiber having an input end and an output end, and the super continuum light source and the non-linear crystal being arranged so that at least a part of output light emitted from the output end of the generator fiber is brought into interaction with the non-linear crystal under an angle of incidence φ relative to a surface of the non-linear crystal.