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Intra-volume marking by laser allows a very local modification of the refractive index in transparent materials. This modification allows an inscription of patterns in 3D to functionalise or create a decorative effect in the material.

The characteristics of the intra-volume marking process:

Beneftis Intra-volume marking


  • Localised
  • No dust
  • High 3D resolution
  • Colouring for doped glasses
Performance Intra-volume marking


  • Refractive index change up to 0.01 depending on the materials
  • Precision 1 μm in XYZ
  • Customized 3D patterns
Productivity Intra-volume marking


  • Processing speed: up to 100 mm.s-1 for index change
  • Process speed for colouring: 1.5 m.s-1


Implementation of the laser - Intra-volume marking

Laser implementation

  • Pulse duration: femtosecond, picosecond and nanosecond
  • Wavelengths: infrared and visible
  • Numerical aperture from 0.2 to 0.4
  • DXF, JPEG implementation
Surface condition Intra-volume marking

Surface condition

Unmodified surface


The transparent materials concerned:

  • Polymer
  • Organic glass
  • Doped glass
  • Industrial glass

Process sheet

Application fields

  • Phase mask
  • Optical microscopy
  • Ophthalmic optics
  • Anti-counterfeiting
  • Bottling
  • Watchmaking
  • Automotive

Associated products or services