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Dielectric Mask

Home » Dielectric Mask

Contents

  • Introduction
  • Dielectric Reflective Mask
  • Transmissive Mask

Introduction

HOLO/OR has developed a series of projection masks to answer the demand of using such masks with very high powered laser sources in the UV-VIS spectrum. These masks have two different forms: the dielectric mask has a reflective coating that blocks unwanted light, and the transmissive mask uses a diffractive pattern that diffuses this unwanted light at large angles.

Typical Parameters:

Outer Diameter:5 - 100 mm
Aperture ShapeRound, square, multi-aperture, other
Aperture Size10 um - 60 mm
Wavelength spectrum193 - 11000 nm, each element designed for single wavelength
Transfer RegionSmall; sharp edges
SNR~500
Shape size>5 um

Dielectric Reflective Mask

Dielectric masks are Fused Silica substrates patterned by very thin (~1um) reflective coating. The coated part reflects the incoming beam while the uncoated part transmits the beam.

Typical Applications:

  • Micro patterns projection for high power systems
  • UV lithography

Schematic sketch of the optical system:

Fig 1. Typical Set Up

HOLO/OR can design and manufacture a custom dielectric mask to match the customer’s needs.

Fig 2.Real measurement of custom Dielectric Mask taken with microscope magnification

Features of Dielectric Mask:

  • High damage threshold
  • Low absorption
  • High reflection (>99%) in reflective part
  • High transmission (>95%) in transparent part
  • Very thin dielectric reflective layer (~1 um)

 

Transmissive Imaging Mask

rinciple of operation:

The Transmissive Mask transmits all incident illumination without any blocking. The pattern to be imaged is a clear mask area that transfers the light without interruption, while the surrounding areas transfer light through a specially designed diffractive pattern which diffuses light in large angles. Placed close to the focal plane of a focusing lens, a pinhole blocks most of the diffused light, so that a high-contrast intensity shape is achieved at the image plane.

Schematic sketch of the optical system:

Features of Transmissive mask:

  • No danger of reflected light causing damage to optical system
  • ~100% transmission
  • Higher laser damage threshold than for reflective mask
  • Affordable price, similar to that of other diffractive elements

Transmissive Mask element

Holo/Or beam shaping

Measured Intensity

Standard products

Part NumberDiameter (mm)Aperture Size (um)Aperture shapeMaterial
DM-0021165SquareFused Silica
DM-00311165SquareFused Silica
DM-00425.41750SquareFused Silica
DM-00525.43500SquareFused Silica
DM-00625.47000SquareFused Silica
DM-00725.410838RoundFused Silica
DM-008208428RoundFused Silica
DM-00925.46200RoundFused Silica
DM-01025.45680RoundFused Silica
DM-011114817RoundFused Silica
DM-012113612RoundFused Silica
DM-013112408RoundFused Silica
DM-014114214.9RoundFused Silica
DM-015113000RoundFused Silica
DM-016115400RoundFused Silica
DM-0178550075SquareFused Silica
DM-01925.4300SquareFused Silica

For a quotation of an above Part Number, please specify the wavelength used.

Contact Us for more information or for a custom solution.

Accessories
  • DOE Tuner Module
  • Beam Shaping Focusing Module
  • Undesired Diffracted Orders Blocker (UDOB)
  • Dielectric Mask
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Design and Manufacture of Diffractive Optical Elements for high power lasers

Tel: +972-89409687
Email: holoor@holoor.co.il

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