Two-Stage Pulse Compressor for Ultrafast Laser Damage Control
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Solution Overview
Problem
Conventional optical amplifiers face challenges in amplifying ultrashort laser radiation due to radiation damage and short component lifetime, necessitating the use of large compressors and optics that are difficult to fabricate, handle, and install, while increasing costs.
Innovation Solution
A pulse compressor system with two compressor elements, where the first element time-compresses pulsed laser radiation by a large factor, followed by a second element compressing it further, allowing for smaller sizes and reduced radiation burden, using gratings or glass materials to mitigate damage and simplify handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single large compressor is used to compress ultrashort laser pulses, then the radiation damage threshold is met, but the device size and complexity increase, making fabrication and installation difficult
Solution Approach 1:
The patent divides a single large compressor into two separate compressor elements arranged in series. The first compressor element compresses the stretched pulse by a first compression factor, and the second compressor element compresses it further by a second compression factor. This segmentation allows each element to be smaller and less complex while collectively achieving the required total compression factor, thus reducing fabrication and installation difficulties while maintaining reliability.
Solution Approach 2:
The patent combines two compression functions into a unified two-stage compressor system. The first compressor element and second compressor element work together in sequence to achieve the total compression required for ultrashort pulse compression. This merging of functions into a coordinated system allows the benefits of segmentation (smaller individual components) while achieving the overall compression goal.
2Object-affected harmful factors
If the beam diameter is increased to decrease energy density, then radiation damage is mitigated, but the compressor size and manufacturing costs increase
Solution Approach 1:
By segmenting the compression function into two elements, each handling a portion of the total compression factor, the patent enables smaller beam diameters to be used in each element compared to a single large compressor. This reduces the size and manufacturing cost of individual components while still protecting against radiation damage through the distributed compression approach.
Solution Approach 2:
The patent changes the compression parameter distribution by applying different compression factors in two stages rather than one stage. This allows optimization of beam diameter and energy density at each stage, reducing the peak energy density on any single optical element while maintaining overall system performance and reducing manufacturing costs.
3Power
If conventional amplifiers are used to amplify ultrashort laser radiation, then amplification is achieved, but radiation damage occurs and component lifetime is shortened
Solution Approach 1:
The patent applies preliminary pulse stretching before amplification, which reduces the peak power during the amplification process. This preliminary action prevents radiation damage to the amplifier and downstream components. The two-stage compressor then restores the ultrashort pulse duration after amplification, achieving both high peak power output and component reliability.
Solution Approach 2:
The patent uses ultrashort pulse durations to rush through the amplifier and compressor system quickly, minimizing the exposure time of components to high-intensity radiation. This reduces cumulative radiation damage and extends component lifetime while still achieving the required amplification and compression.
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 reduces the size and complexity of compressors and optics, lowering manufacturing costs and improving flexibility in beam path installation, while extending the lifetime of optical components and enhancing temporal intensity characteristics of the compressed radiation.
Implementation Method 1
The first compressor element (14a) may be configured to time-compress the pulse of the pulsed laser radiation by a first compression factor
Implementation Method 2
the second compressor element (14b) may be configured to time-compress the pulse of the first compressed radiation by a second compression factor
Implementation Method 3
using gratings or glass materials to mitigate damage and simplify handling
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A pulse compressor for time-compressing pulsed laser radiation according to a chirped pulse amplification, CPA, scheme, the pulse compressor comprising a first compressor element, and a second compressor element. The first compressor element is configured to receive as input the pulsed laser radiation and to produce as output first compressed radiation having a first pulse duration. The second compressor element is configured to receive as input the first compressed radiation and to produce as output second compressed radiation having a second pulse duration. The second pulse duration is shorter than the first pulse duration. The first compressor element is configured to time-compress the pulse of the pulsed laser radiation of a first compression factor. The second compressor element is configured to time-compress the pulse of the first compressed radiation of a second compression factor. The first compression factor is larger than the second compression factor.