Pulse-Managed Light Source for High-Power Supercontinuum Output

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Solution Overview

Problem

Current broadband and supercontinuum light sources face limitations in power output due to accelerated degradation of nonlinear optical elements, leading to reduced lifetime and lower spectral power density.

Innovation Solution

A light source that distributes optical power over an increased number of pulses within a predetermined time period, maintaining peak power below a predefined maximum level to prevent material degradation, thereby generating high-power supercontinuum light with extended element lifetime.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If high optical power is input to nonlinear optical elements for supercontinuum generation, then spectral power density and total output power are improved, but the nonlinear optical elements experience accelerated degradation and reduced lifetime

Engineering Contradiction:

Improvespectral power densityVSAvoidelement lifetime

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent employs periodic pulsed operation where the light source operates in cycles of high-power pulse generation followed by rest periods. This allows the nonlinear optical elements to experience high spectral power density during pulse intervals while undergoing thermal relaxation and degradation reduction during off intervals, effectively managing the trade-off between power output and element lifetime

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system pre-cools or pre-stabilizes the nonlinear optical elements before high-power operation begins. This preliminary preparation reduces the initial thermal stress and degradation rate when high-power pulses are applied, allowing sustained high spectral power density operation with extended element lifetime

Inventive Principle:

Principle #10Preliminary action

2Productivity

If continuous high-power operation is maintained, then productivity and output power are improved, but thermal accumulation causes accelerated material degradation

Engineering Contradiction:

Improveoutput powerVSAvoidthermal degradation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system uses periodic pulsed operation with duty cycles that limit continuous high-power exposure. High-power pulses are interspersed with lower-power or zero-power intervals, maintaining high average productivity while allowing thermal dissipation during off-periods to prevent cumulative thermal degradation

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent dynamically adjusts operational parameters including pulse duration, repetition rate, and peak power levels based on real-time thermal monitoring. This allows the system to maintain high productivity when thermal conditions permit while automatically reducing power levels to prevent thermal degradation when temperature thresholds are approached

Inventive Principle:

Principle #35Parameter changes

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 approach allows for higher total optical power input to nonlinear optical elements without causing accelerated degradation, resulting in high-power supercontinuum output with high spectral power density over a broad wavelength range.

Implementation Method 1

Supercontinuum generation relates to the formation of a broad, typically continuous spectrum through propagation of high-power light, typically pulses, through a nonlinear element, such as a nonlinear fiber. The term supercontinuum does not cover a specific phenomenon but rather can include at least some of a plethora of nonlinear effects, such as self-phase modulation, Raman scattering, phase matching and soliton generation, leading to considerable broadening of optical pulses.

Methodology Applied

Scientific EffectSupercontinuum generation:

Implementation Method 2

The term supercontinuum does not cover a specific phenomenon but rather can include at least some of a plethora of nonlinear effects, such as self-phase modulation, Raman scattering, phase matching and soliton generation, leading to considerable broadening of optical pulses.

Methodology Applied

Scientific EffectSelf-phase modulation:

Implementation Method 3

Methodology Applied

Scientific EffectRaman scattering:

Data Source

PatentUS20250013120A1Light source

Publication Date: 2025.01.09 NKT PHOTONICS AS

AI summary

A light source including: a pulse generator for providing a first sequence of light pulses, the first sequence of light pulses including a first number of light pulses within a predetermined time period, a manipulator configured to generate a second sequence of light pulses from the first sequence of light pulses, the second sequence of light pulses having a second number of light pulses within the predetermined time period, the second number being different from the first number, and a nonlinear optical element arranged to receive the second sequence of light pulses.