Pulsed Laser Intrinsic Marking for Tamper-Proof Identification
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Solution Overview
Problem
Existing methods for laser-based markings, particularly those using continuous wave lasers, struggle to create unique and tamper-proof identifiers due to limitations in surface roughness and color pattern uniformity, especially when dealing with compositionally inhomogeneous substrates and the potential for replication or counterfeiting.
Innovation Solution
A method involving pulsed laser irradiation with short to ultra-short pulses, interacting with a background gas to create intrinsic microscopic features, including color patterns and periodic surface structures, which are virtually impossible to replicate due to their complexity and randomness, utilizing a variety of wavelengths and pulse durations to form unique identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous wave laser exposure is used to create surface colorization, then the color pattern can be formed through oxide layer growth, but the markings lack unique identifiers and are susceptible to replication and counterfeiting
Solution Approach 1:
The patent employs pulsed laser irradiation instead of continuous wave exposure, using periodic pulses to create color layers with unique interference patterns. The pulsed nature allows control over oxide layer thickness and creates inherent randomness in the marking patterns, making each marking unique and difficult to replicate while maintaining a relatively simple implementation approach
Solution Approach 2:
The patent utilizes changes in laser parameters (pulse duration, repetition rate, fluence) to control the oxide layer formation process. By varying these parameters, the system can create diverse color patterns and surface roughness characteristics that serve as unique identifiers, enhancing reliability without requiring complex additional components
2Reliability
If pulsed laser irradiation is used to create unique identifiers, then complex and unique markings are generated that are difficult to replicate, but the process requires precise control of multiple parameters including pulse duration, repetition rate, and fluence
Solution Approach 1:
The patent leverages the self-organizing nature of the laser-material interaction process, where the oxide layer growth and interference pattern formation occur automatically based on the laser parameters and material properties. This self-service mechanism reduces the need for complex real-time control systems, as the unique markings emerge naturally from the physical processes rather than requiring precise manual adjustment of multiple parameters
Solution Approach 2:
The system utilizes controlled variations in laser parameters to generate diversity in markings. By adjusting pulse duration, repetition rate, and fluence, the process can create different color patterns and surface features, providing ease of operation through parameter tuning rather than complex mechanical or optical adjustments
3Reliability
If laser irradiation creates surface roughness through point-to-point fluence variations, then unique microscopic features are formed, but the surface uniformity is compromised
Solution Approach 1:
The patent embraces local variations in surface properties as a feature rather than a defect. The point-to-point fluence variations create localized differences in oxide layer thickness and surface roughness, which serve as unique microscopic identifiers. This local quality approach transforms what would traditionally be considered non-uniformity into a valuable characteristic for authentication
Solution Approach 2:
The pulsed laser irradiation creates periodic heating and cooling cycles that amplify local fluence variations, leading to distinct microscopic features at different locations. This periodic action enhances the uniqueness of surface features while maintaining overall color pattern uniformity through controlled average fluence
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 method generates complex, unique markings that are difficult to replicate, providing effective tamper indication and counterfeiting detection through the creation of intricate color patterns and surface features that can be documented and archived for comparison.
Implementation Method 1
laser irradiation can color the exposed surfaces of various materials by forming an oxide or nitride layer
Implementation Method 2
forming an oxide or nitride layer (referred to herein as a 'thin film' or 'color layer' or 'color pattern')
Implementation Method 3
Localized heating, provided by a focused laser beam, can lead to the growth of dielectric phases
Implementation Method 4
surface colorization of metals and alloys is a thermochemical growth process facilitated by the heat of absorbed laser light
Implementation Method 5
the heat of absorbed laser light
Data Source
AI summary
A method of pulsed laser intrinsic marking can provide a unique identifier to detect tampering or counterfeiting.