Compare Model Drawings, CAD & Specs Diameter Edge Thickness Coating Type OEM Compatibility Availability Price
631030-117
Contact Us
 631030-117 2.0 in. 25 mm 90PS Nanjing TK
Contact Us
631073-117
Contact Us
 631073-117 2.0 in. 54 mm 90PS-HR Balliu
Contact Us
631182-117
Contact Us
 631182-117 80 x 60 mm 20 mm 90PS-HR
Contact Us
631370-117
Contact Us
 631370-117 25 mm 0.984 in. 90PS-HR JFY
Contact Us
631380-117
Contact Us
 631380-117 2.68 in. 20.32 mm 90PS Trumpf
Contact Us
631519-117
Contact Us
 631519-117 2.25 in. 31.75 mm 90PS Cincinnati
Contact Us

Specifications

  • Type
    90° Phase Shift Mirror
  • Optic Material
    Copper (Cu)
  • Angle of Incidence
    45°
  • S1 Radius
    Plano
  • S2 Radius
    Plano
  • Phase Shift Tolerance
    90°±2°
  • Surface Quality
    10-5 scratch and dig
  • Surface Irregularity
    1 Fringes @ 633 nm
  • Power
    2 Fringes @ 633 nm
  • Diameter Tolerance
    +0 / -0.12 mm
  • Thickness Tolerance
    ±0.25 mm
  • Wedge
    <3' (arc minutes)
  • Water Cooled
    Yes

Features

90° Phase Shift Mirrors

Most CO2 lasers produce a laser beam which has linear polarization. For cutting metal sheets, however, a beam with circular polarization is required if the cutting properties are independent of the cutting direction. To convert a beam from linear to circular polarization, a 90° phase retarder mirror (also called a Lambda/4-mirror) can be used. This mirror has a special coating which produces a phase shift of 90° between the s-and p-polarized components of the reflected beam. If these components have the same intensity and phase (corresponding to linear polarization), the reflected beam undergoes a phase shift of 90° between both components (corresponding to linear polarization).

Water Cooled for High Power Lasers

As the output power of the CO2 laser is getting higher throughout the years, the technical demands and damage threshold the CO2 laser optics need to withstand is more challenging. As a solution to those challenges optics manufacturers added cooling system to the CO2 laser Cu mirror, by that the mirror will be less inclined to thermal expansion, and a proper cooling of the optical surface is ensured. The cooling of the CO2 laser optic surface is achieved by drilling of channels close to the surface, by that there is less damage to the coating as in is exposed to less heat. This drilling is not applicable to Si mirrors due to the brittleness of the material.

90 Phase Shift Mirror Coatings

The optical properties of a mirror (reflectance, phase shift, etc.) are determined by its coating. In order to realize different mirror functions, different coatings are needed.

The new 90º Phase Shift High Reflection (90PS-HR) coating features higher reflection compared to standard 90PS coating, resulting in less power loss and increased life expectancy. This is an improvement over our standard 90º phase shift coating, reducing absorption level by 50% and setting it to be lower the 1%. This superior absorption level is achieved with no compromise in the phase shift performance (tolerance ±2º) or visible light (630-670 nm) reflection. This coating becomes our standard for 90º phase shift mirrors.

Coating Substrate %R@45°@10.6 %R@45°@Visible Phase Shift@45°
90PS Si&Cu 98% ≥80%@630-670 nm 90°±2°
90PS-HR Si&Cu 99% ≥80%@632.8 nm 90°±2°

Resources

Catalogs

MSDS

Contact Us illustration

Have questions? Require assistance?

Click below to to contact Ophir Laser Optics and we'll get back with you shortly.

Contact Ophir Laser Optics