Zero-order air-gap waveplate (WPA415)
Zero-order air-gap waveplate is composed of two quartz plates mounted on a holder, with an air gap formed between the two quartz plates. The thickness difference between the two quartz plates determines the retardation. The dependence of zero-order air-gap waveplates on temperature and wavelength variations is significantly lower than that of multi-order waveplates.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Material | Quartz |
| Diameter Tolerance | +0.0 mm, -0.1 mm |
| Wavefront Distortion [@ 632.8nm] | λ/8 @ 632.8 nm |
| Retardation tolerance | λ/300 |
| Parallelism | <1 ″ |
| Surface Quality | 20/10 |
| Clear Aperture | >90 % |
| Coating [S1&S2；@ Wavelength] | S1&S2: R<0.2 % @ wavelength |
| Standard Wavelength | 266 nm、355 nm、532 nm、632.8 nm、780 nm、808 nm、850 nm、980 nm、1064 nm、1310 nm、1480 nm、1550 nm |
| Diameter [Quarter-wave Plate] | 15.0 mm |
Key Features
Datasheet
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Waveplate Waveplates 100optics
Transmission range [General page-top description, without specific subtype/material identification]: 330-2100 nm Coefficient of Thermal Expansion [General page-top description, without specific subtype/material identification]: 7.5x10⁻⁶ Density [General page-top description, without specific subtype/material identification]: 2.51 g/cubic centimeter
Waveplates are made from birefringent materials. The speeds of the o ray and the other ray through the material are inversely proportional to their refractive indices. Their speed difference produces a phase difference when they recombine; at a particular wavelength, this is determined by the retarding thickness. Transmission range: 330–2100nm. Thermal-expansion coefficient: 7.5 x10⁻⁶/K. Density: 2.51g per cubic centimeter. Half-wave plates: thickness gives a phase difference of L/2 wavelengths for true zero order, or multiples of l/2 wavelengths for multiple order. A linearly polarized incident beam remains linearly polarized, but its angle to the optical axis is twice the incident angle. A half-wave plate therefore acts as a continuously adjustable polarization rotator, used to rotate the polarization plane, for electro-optic modulation, and with a polarizing cube as a variable-ratio beamsplitter. Quarter-wave plates: thickness gives a phase difference of L/4 wavelengths for true zero order, or multiples of l/4 wavelengths for multiple order. When the angle q between the incident electric-field vector and the retarding principal plane is 45, the output is circularly polarized. Double passage by mirror reflection makes a quarter-wave plate act as a half-wave plate, rotating the polarization plane through a particular angle. Applications include generating circular or linear polarization from circular or elliptical states, optical pumping, suppressing unwanted reflections, and optical isolation.
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