Design and manufacture of diffractive
optical elements

Dual Wavelength - focus combiner of CO2 laser and aiming beam

In multi-wavelength light beams the dual wavelengths are diffractive optical elements used to combine two incident beams with different wavelengths into the same focal point.
In particular, this focus combiner is used for combining CO2 laser focus and visible aiming beam focus into a single focal point.
The Dual wavelength corrects the strong chromatic aberrations between a CO2 laser and its visible aiming beam.
This hybrid element,is based on a Plano convex lens with corresponding diffractive pattern on its Plano side.
The focal length for both wavelengths is determined during the design, according to the customer's application.

HOLO/OR is offering a Diffractive F-Theta lens with Dual Wavelength lens for medical treatments and scanner systems. This option eliminates the need to place the Dual Wavelength lens inside the scanner, and provides both focal shift and field corrections. These elements are represented by the part numbers with FT in the below table (as FT-001-AP-Y-A).
DualWavelengthDual Wavelength

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Part Number Wavelength (nm) Input Beam 1/e2@633nm (mm) Working Distance (mm) Dimensions (mm) Material Coating Remarks
DW-201-AP-Y-A 10600, 633 4-8.8 125 15 ZnSe AR-V Coating
DW-208-AP-Y-A 10600, 633 4-13.3 100 38.1 ZnSe AR-V Coating
DW-202-AP-Y-A 10600, 633 4-12 20 19 ZnSe AR-V Coating
FT-001-AP-Y-A 10600, 633 4-10 31.67 25.4 ZnSe AR-V Coating Diffractive F-Theta
for both wavelengths
Wavelength range:193nm to 10.6um
DOE design:4 levels to 16-level
Diffraction efficiency:81% - 96%
Element size:Few mm to 100mm
Damage threshold:~3 J/cm2 in 7nS pulse at 1064nm
Coating (optional):AR/AR Coating
Custom Design:Almost any chromatic aberrations correction
  • High power threshold
  • Compact size
  • High efficiency
  • Pure ZnSe
  • Optional Ar/Ar coating
  • Surgical laser systems
  • Industrial CO2 laser systems
@Copyright 2018, Holo/Or Ltd. P.O.B 1051, Rehovot, 7611001 Israel
Phone: +972-89409687/8, Fax: +972-89409606

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