QLD3225
Linearly polarized light is undesirable in some optical systems. In reflective spectrometers, for example, polarization effects can affect detector sensitivity. Depolarizers convert polarized light into randomly polarized light and are widely used in polarization-sensitive systems and instruments. Achromatic depolarizers primarily convert polarized beams into randomly polarized beams. For a linearly polarized monochromatic source, the output polarization state varies spatially; for a broadband source, the spatial variation also depends on wavelength. An achromatic depolarizer consists of two crystalline-quartz wedges, cemented or optically contacted, with one twice as thick as the other. Each wedge's optical axis is parallel to its transmitting face, and the axes of the two wedges are at 45° to each other. This design requires no particular orientation of the depolarizer's optical axis, which is useful when the incident polarization is unknown or varies over time. For monochromatic light, the incident beam diameter must be >6mm for good depolarization because polarization randomness is produced by spatial variation across the beam. Broadband sources have no beam-diameter requirement: wavelength-dependent phase retardation, in addition to spatial variation, also randomizes the transmitted polarization.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Material | Quartz Crystal |
| Type | Cemented |
| Dimensions | 25.4 mm |
| Thickness | 7.5 mm |
| Design Wavelength | 400-2500 nm |
| Dimensional Tolerance | +0/-0.2mm |
| Thickness Tolerance | ±0.2mm |
| Surface Quality | 60/40 |
| Clear Aperture Dimension | >90% |
| Surface Figure [@632.8nm] | <λ/8@632.8nm |
| Parallelism | <1minutes |
| Beam Deviation | <3minutes |
| Coating [Standard product] | Standard Products Are Uncoated; Coating Available on Request |
| Damage Threshold [20ns, 20Hz @1064nm] | >500mJ/cm², 20ns, 20Hz @1064nm |
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