Optical Fiber Pulse Amplifier Layout for Low-Distortion Laser Delivery
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Solution Overview
Problem
Existing delivery systems for high-power laser pulses in optical fibers face challenges with dispersion and non-linear effects, especially over long distances, leading to distorted pulse shapes and spectra, which affect accuracy and performance in applications requiring precise power, duration, and shape parameters.
Innovation Solution
A delivery system design that amplifies low-power laser pulses proximal to the delivery end, minimizing deformation through a first pulse amplifier positioned along the optical fiber path, and includes a pulse conditioner to compensate for dispersion and non-linearity effects, with optional oversized and extensible fiber sections to accommodate varying distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If high-power laser pulses are transmitted through optical fiber over long distances, then the transmission distance is increased, but dispersion and non-linear effects cause pulse deformation and spectral distortion
Solution Approach 1:
The optical fiber path is divided into two distinct sections: a first optical fiber section for transmitting low-power pulses where dispersion and non-linear effects are minimized, and a second optical fiber section for transmitting high-power pulses from the amplifier to the endpoint. This segmentation allows each section to be optimized for its specific power level, resolving the contradiction between transmission distance and pulse quality.
Solution Approach 2:
The laser pulses are amplified to high power before entering the second optical fiber section, rather than attempting to transmit high power over the entire distance. This preliminary amplification action at a specific point along the path allows the majority of the transmission distance to be covered at low power, minimizing deformation while still achieving long-distance high-power delivery.
2Power
If laser pulse power is increased to meet endpoint requirements, then the power at the delivering end is sufficient, but dispersion and non-linear effects distort the pulse shape and spectrum
Solution Approach 1:
The power transmission is segmented into two stages: low-power transmission through the first optical fiber section to minimize deformation, followed by amplification to high power at the amplifier, and then high-power transmission through the second optical fiber section to the endpoint. This resolves the contradiction by ensuring high power is only maintained over the shorter second section where deformation is less critical.
Solution Approach 2:
The pulse amplifier serves as an intermediary device positioned at a specific location along the optical fiber path. It receives low-power pulses from the first section, amplifies them to the required high power level, and transmits them through the second section to the endpoint. This intermediary amplification allows the system to achieve both sufficient endpoint power and minimal pulse deformation.
3Length of stationary object
If a pulse amplifier is positioned closer to the pulse producer, then less fiber length is required for amplification, but the high-power pulse travels a longer distance causing more deformation
Solution Approach 1:
The optical fiber path is segmented into a first section (from pulse producer to amplifier) and a second section (from amplifier to endpoint). The amplifier is positioned to create an asymmetric segmentation where the first section is optimized for low-power transmission and the second section for high-power transmission. This segmentation resolves the contradiction by minimizing the high-power transmission distance while maintaining total path length.
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 system delivers high-power laser pulses with improved accuracy and reduced distortion, enabling flexible and cost-effective deployment across diverse applications by minimizing dispersion and non-linearity effects, particularly suitable for THz-based material inspection systems.
Implementation Method 1
a first optical fiber path configured to convey a first low-power laser pulse from the pulse producer to the first pulse amplifier, and to convey a first high-power laser pulse from the first pulse amplifier to the first delivering end
Implementation Method 2
The first pulse amplifier is configured to amplify the first low-power laser pulse to produce a first high-power laser pulse
Data Source
AI summary
Delivery systems comprising pulse producer and first pulse supplier including first optical fiber path, first pulse amplifier and first delivering end. Pulse producer produces first low-power laser pulse having power predefined to avoid or minimize deformation of first low-power laser pulse. First pulse amplifier amplifies first low-power laser pulse to produce first high-power laser pulse having power predefined to operate first end-component connectable with first delivering end. First optical fiber path has initial section to convey first low-power laser pulse from pulse producer to first pulse amplifier, and final section to convey first high-power laser pulse from first pulse amplifier to first delivering end. First pulse amplifier is arranged at a position along first optical fiber path corresponding to distal position relative to pulse producer or proximal position relative to first delivering end. Methods and computer programs suitable for being performed by/at such delivery systems.