90° Phase Shift

 90ֲ° Phase Shift Mirror

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).

CO2 Optics Catalog
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 Optic TypeOphir P/NDiameterEdge Thickness
InchmmInchmm
 Open specSi Mirror-90° Phase Shift630324-117 1"25.40.118"3
 Open specSi Mirror-90° Phase Shift630063-117 1.5"38.10.157"4
 Open specSi Mirror-90° Phase Shift630784-117 1.75"44.450.374"9.52
 Open specSi Mirror-90° Phase Shift630066-117 2"50.80.374"9.52
 Open specSi Mirror-90° Phase Shift630715-117 2"50.80.2"5.08
 Open specSi Mirror-90° Phase Shift62238 2.67"67.810.8"20.32
 Open specSi Mirror-90° Phase Shift630327-117 3"76.20.374"9.52
 Open specSi Mirror-90° Phase Shift630068-117 3"76.20.25"6.35
 Open specCu Mirror-90° Phase Shift61409 1.5"38.10.295"7.5
 Open specCu Mirror-90° Phase Shift61802 1.5"38.10.25"6.35
 Open specCu Mirror-90° Phase Shift630781-117 1.97"50.030.393"10
 Open specCu Mirror-90° Phase Shift62281 2"50.82.125"54
 Open specCu Mirror-90° Phase Shift61800 2"50.80.4"10.16
 Open specCu Mirror-90° Phase Shift61267 2"50.80.374"9.52
 Open specCu Mirror-90° Phase Shift61260 2"50.80.2"5.08
 Open specCu Mirror-90° Phase Shift631073-117* WC2"50.82.125"54
 Open specCu Mirror-90° Phase Shift62242 2.25"57.151.25"31.75
 Open specCu Mirror-90° Phase Shift61801 2.25"57.150.393"10
 Open specCu Mirror-90° Phase Shift631519-117* WC2.25"57.151.25"31.75
 Open specCu Mirror-90° Phase Shift630630-117 2.25"57.150.393"10
 Open specCu Mirror-90° Phase Shift61384 2.36"59.940.393"10
 Open specCu Mirror-90° Phase Shift630914-117 2.362"59.990.59"15
 Open specCu Mirror-90° Phase Shift631380-117* WC2.68"68.070.8"20.32
 Open specCu Mirror-90° Phase Shift61821 2.95"74.930.5"12.7
 Open specCu Mirror-90° Phase Shift61262 2.95"74.930.59"15
 Open specCu Mirror-90° Phase Shift631007-117 3"76.20.59"15
 Open specCu Mirror-90° Phase Shift61264 3"76.20.5"12.7
 Cu Mirror-90° Phase Shift631182-117* WC 80*60 20.00