Ceramic Data Recording Using DMD-Controlled Ultrafast Laser Ablation
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Solution Overview
Problem
Existing methods for recording data in ceramic materials are cumbersome and time-consuming, particularly when using laser beams with fixed focal points, and suffer from low data density due to uncontrolled ablation processes that result in irregular hole shapes.
Innovation Solution
The use of a digital micromirror device (DMD) with a picosecond or femtosecond laser to selectively illuminate regions of a ceramic material, creating well-defined recesses by interacting with the material's electrons to achieve high data density through controlled ablation, allowing for rapid and reproducible data recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a laser beam with fixed focal point is used with XY positioning system, then data can be recorded in ceramic material, but the recording process is cumbersome and time-consuming
Solution Approach 1:
Instead of moving the ceramic plate under a fixed laser focus, the patent inverts the approach by keeping the laser beam stationary and using a digital micromirror device to dynamically steer and focus multiple laser beams to different locations on the ceramic material simultaneously, thereby achieving rapid recording without mechanical positioning of the substrate
Solution Approach 2:
The patent replaces the mechanical XY positioning system with an optical control system using a digital micromirror device that electronically directs laser beams to desired locations, eliminating the need for physical movement of the ceramic plate and enabling parallel processing of multiple recording points
2Manufacturing precision
If traditional laser ablation is used on ceramic material, then data can be recorded, but the ablation process is uncontrolled and produces irregular hole shapes
Solution Approach 1:
The patent changes the temporal parameter of the laser pulse duration to picosecond or femtosecond range, which fundamentally alters the ablation mechanism from thermal heating to Coulomb explosion, producing controlled, circular recesses with sharp edges and eliminating the irregular hole shapes and molten material rings characteristic of traditional nanosecond laser ablation
Solution Approach 2:
The patent employs periodic picosecond or femtosecond laser pulses to ablate the ceramic material, where the extremely short pulse duration allows each pulse to create a precisely defined recess without significant heat diffusion, ensuring reproducible hole shapes and dimensions across multiple pulses and locations
3Manufacturing precision
If rotating disc technology is used for laser recording, then data can be recorded in ceramic material, but the recording process is slow due to sequential pit creation
Solution Approach 1:
The patent merges multiple laser beam functions into a single stationary laser source by using a digital micromirror device to split and direct the laser beam to multiple locations simultaneously, enabling parallel creation of multiple recesses in one operation rather than sequential processing as in rotating disc technology
Solution Approach 2:
The patent transitions from the sequential one-dimensional spiral recording path of rotating disc technology to a two-dimensional parallel recording approach where multiple laser beams can simultaneously address different locations across the ceramic surface, dramatically increasing recording throughput
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 method enables high-speed data recording with increased data density, achieving speeds of up to 10 GB/s and allowing for reproducible read-out technology by generating extremely small, well-defined recesses with sharp edges, significantly surpassing traditional recording media.
Implementation Method 1
A picosecond or femtosecond laser pulse interacts with outer valence electrons responsible for chemical bonding, which valence electrons are thus stripped from the atoms, leaving the latter positively charged. Given a mutually repulsive state between atoms whose chemical bonds are broken, the material 'explodes' into a small plasma cloud of energetic ions
Implementation Method 2
The parameters of the laser beam and the time of illumination for each of the selected regions are configured so as to ablate each of the selected regions in order to record data in the layer of the ceramic material by creating recesses in the layer of the ceramic material
Data Source
AI summary
The present invention relates to a method for recording data in a layer of a ceramic material and to a device for recording data in a layer of a ceramic material.