Manufacturers and Suppliers of Electro-Optic Components

Low Order Quartz Retardation Plates

Diagram showing mounted quartz retardation plate

These retardation plates use high optical damage threshold crystal quartz. They are orientated with the optic axis in the plane of the plate and light polarised at 45░ to the quartz optic axis is resolved into two equal amplitude components that suffer a relative phase retardation due to their different propogating velocities. Most low orderplates lie in a thickness range of 100-200Ám (At 1.06Ám a first order l/2 plate is aproximately 182 Ám thick). Low order plates are generally used because they are relatively temperature insensitive compared to high multiple order plates. They are also less sensitive to axial misalignment.

Retardation plates can be supplied mounted or unmounted with or without A.R. coatings.

Specifications

Material Crystal Quartz

Surface Quality

20 - 10
Diameter Tolerance + 0.00mm - 0.1mm
Retardation Tolerance l/250
Damage Threshold 1 GW/cm2nanosecond
pulse length at 1064 nm
Max cw Poweer 200W/cm2
Transmission Uncoated 92%
Spectral Range 220 - 2800 nm

Standard Sizes

Type Clear Aperture Mount Dia.

QWP 10

10mm

25mm
QWP 20 20mm 25mm
QWP 25 25mm 35mm
QWP 30 30mm 40mm

Low order Half and Quarter wave plates having the above dimensions are held in stock and can be supplied coated or uncoated. They are generally available from stock for most common laser wavelengths. All waveplates can be supplied mounted or unmounted. Other dimensions can also be supplied.

Dual Wavelength Plates

For a given plate thickness a low order waveplate will operate as a quarterwave, halfwave and full wave plate at different wavelengths. By selecting the thickness it is possible to achieve a dual order plate giving for example, halfwave retardation at
1064 nm and fullwave retardation at 532 nm. Because of the wide range of possibilities these plates are not held in stock, but we would be pleased to manufacture plates where possible to customer requirements.

Quartz Optical Rotators

When plane polarised light propogates along the optic axis of quartz, it is rotated clockwise or anticlockwise depending on whether it is right or left hand quartz. The rotation is dependent on the wavelength and the distance travelled, as shown below.

Diagram showing rotation angle versus thickness for quartz rotation plate

Specific Rotary Power

Quartz rotators can be supplied to give 90 rotation or any angle between 0-90. They are ordered as standard components with the same aperture and mount dimensions as those shown for retardation plates but by using the suffix, QOR.




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