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Laser mark formed inside transparent bodies near the surface

A marking and transparent technology, applied in the direction of thermography, burning, etc., can solve the problems of limited processing depth and inappropriate methods, and achieve the effect of improving strength

Active Publication Date: 2008-08-13
OERLIKON SURFACE SOLUTIONS AG PFAFFIKON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For non-quartz glass another disadvantage is due to the use of UV light in EP1051365
Ultimate penetration depth of UV light in the vitreous (due to absorption) limits treatment depth
Therefore the method proposed in EP1051365 is not suitable if markings are to be formed through the substrate immediately below the surface

Method used

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  • Laser mark formed inside transparent bodies near the surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The invention is described in detail below with the aid of examples.

[0032] In the first example, Borofloat glass is coated with four layers of anti-reflective coating. Borofloat glass has a refractive index of 1.52. The following layer system is applied by means of the PVD method (Physical Vapor Deposition):

[0033] Refractive index

Thickness [nm]

Air

Layer 4

Layer 3

Layer 2

Layer 1

Glass

1

1.38

1.905

1.76

1.38

1.52

-

114.673913

83.0708661

89.9147727

229.347826

-

[0034] Next, the substrate is internally processed with a frequency-doubled Nd:YAG laser, that is, the wavelength of the laser used to form the mark is 532 nm in air.

[0035] The use of visible light, i.e. light in the wavelength range from 420nm to 780nm, offers significant advantages over the wavelengths chosen in the prior art:

[0036] If light from ND:YAG lasers at 1064m, ie ...

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Abstract

The invention relates to a method for producing a mark in a transparent body under the surface thereof. According to said invention, the mark is located at least at 500?m below the surface because a layer system, whose destruction threshold is greater than that of a substrate, is applied to a substrate surface. When the layer system is embodied in the form of a readout wavelength antireflection layer system, a contrast is increased during reading. The embodiment of the layer system in the form of a writing wavelength mirror makes it possible to write with reduced intensity reflection.

Description

technical field [0001] The invention relates to a method for producing markings in a transparent body below the surface of the transparent body. In particular, the invention relates to a method for producing markings on transparent bodies having a layer system. Background technique [0002] For the purposes of the present invention, the term "glass" is to be regarded in a completely generalized manner as a transparent body. A body is considered transparent in this context to a wavelength of light if the penetration depth of the radiation is at least 1 / 10 of that wavelength. [0003] The internal treatment of glass with laser beams is known. In Laser Magazine 1 / 95, pages 16ff., for example, a method is described in which the internal treatment of the glass is carried out with the laser beam of an Nd:YAG laser. In this case, a suitable beam shape ensures that the beam intensity at the glass surface is well below the destruction threshold. Focusing on the inside of the glas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/34C03C23/00B41M5/26
CPCC03C23/0025B41M5/24C03C17/34C03C23/0015C03C23/00B41M5/26
Inventor P·斯莫尔M·兰克C·海恩-坎普肯斯
Owner OERLIKON SURFACE SOLUTIONS AG PFAFFIKON