Method for realizing information storage and encryption by preparing high-capacity color code based on femtosecond laser
A femtosecond laser, information storage technology, used in laser welding equipment, welding equipment, manufacturing tools, etc.
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Embodiment 1
[0027] Embodiment 1, a method for preparing high-capacity color codes based on femtosecond lasers to realize information storage and encryption, comprising the following steps:
[0028] 1) Use an area of 2×2cm 2 , a TC4 metal sheet with a thickness of 2mm (the composition of the titanium alloy TC4 material is Ti-6Al-4V, containing the remainder of titanium (Ti), iron (Fe) ≤ 0.30, carbon (C) ≤ 0.10, nitrogen (N) ≤ 0.05 , hydrogen (H) ≤ 0.015, oxygen (O) ≤ 0.20, aluminum (Al) 5.5 ~ 6.8, vanadium (V) 3.5 ~ 4.5) as the processing object;
[0029] 2) Build the optical path, refer to figure 1 , the output light of the femtosecond laser 1 passes through the half-wave plate 2, the Glan Taylor prism 3, the half-wave plate 4, the beam expander 5 and the aperture diaphragm 6 in turn, and finally passes through the two-axis scanning galvanometer system 7 to focus to the scissor lift On stage 8, the femtosecond laser 1 and the two-axis scanning galvanometer system 7 are connected to th...
Embodiment 2
[0035] Example 2, the material in Example 1 is selected as a metal film with 100nm Ti and 20nm Au deposited sequentially on the glass substrate as the processing object, the laser energy and scanning speed are adjusted, and the femtosecond laser preparation cycle is obtained on the sample Permanent surface structure, as a high-capacity color code, the parameters prepared by femtosecond laser are: laser energy 400-500mW, scanning speed 100-450mm / s, repetition frequency 200kHz, scanning spacing 5μm.
[0036] refer to Figure 4 , the four colors in the high-capacity color code are represented by ripples in four directions. refer to Figure 5 (a-d), when the high-capacity color code is irradiated with a light source, the fixed incident angle is 35°, with the clockwise rotation of the high-capacity color code, the blue pattern representing each quaternary number will appear in turn, when a When the light source irradiates different quaternary numbers, the quaternary numbers of di...
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