Middle Infrared zero order waveplate is constructed by two Magnesium Fluoride (MgF2) plates with their fast axis crossed, the two plates are constructed by optically contacted method, the optical path is epoxy free. The difference in thickness between the two plates determines the retardance. Middle Infrared zero order waveplates is widely used in infrared applications, ideally for 2.5-6.0 micron range.
★ Ideal for Applications in the 2.5-6.0μm Range
★ High Damage Threshold
★ Better Temperature Bandwidth
★ Wide Wavelength Bandwidth
★ Both Sides AR Coated
★ RoHS Compliant
- Specifications
- Curve
- Selection Guide
- Feedback
| Material | MgF2 |
| Dimension Tolerance | +0.0/-0.2mm |
| Surface Quality | 60/40 scratch and dig |
| Clear Aperture | >90% central area |
| Wavefront Distortion | <λ/4@632.8nm |
| Parallelism(single plate) | <5 arc seconds |
| Retardation Tolerance | <λ/100 |
| Standard Wave | quarter-wave(λ/4), half-wave(λ/2) |
| Wavelength Range | 2500-6000nm |
| AR Coating | R<0.5%@central wavelength |
| Damage Threshold | >1J/cm2, 20ns, 20Hz @1064nm |
Waveplate Comparison
Waveplate Type | Structure | With Glue | Temperature Bandwidth | Wavelength Bandwidth | Retardation Tolerance | Parallelism | Damage Threshold | Other Features |
Zero order Waveplate | | Two Plate | Yes | Large | Wide | High | Good | Low |
|
| Two Plate | No | Large | Wide | Higher | Better | High |
|
| Two Plate | No | Large | Wide | Higher | Better | Higher |
|
| Cemented | Two Plate | Yes | Large | Wide | Higher | Better | Low |
|
Single Plate | Single Plate | No | Larger | Wide | Higher | Better | Higher | Wide Acceptance Angle |
| Single Plate | No | Larger | Wide | Higher | Better | Higher | Wide Acceptance Angle |
| Single Plate | No | Low | Narrow | General | Better | Higher |
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| Single Plate | No | Low | Narrow | General | Better | Higher |
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| Single/Two Plate | No | Large | Wide | General | Better | High | Using in 2.5-6.0μm Range |
| Cemented | Two/Multi Plate | Yes | Large | Very broad | High | Good | Low |
|
Air Spaced | Two/Multi Plate | No | Large | Very broad | High | Better | Higher |
|
Wedge Waveplate | Two Plate | Yes | Large | Wide | Higher | / | Low | Eliminate Etalon effect |
How to choose a waveplate?
Firstly, you should know the retardation, is it a half waveplate or a quarter waveplate? Or even a special retardation?
Then, you should know the size and working wavelength.
Last, you should choose a type of waveplate. If temperature bandwidth and wavelength bandwidth is important for you, you should choose zero order or true zero order. For zero order, optical contacted has better wavefront distortion and parallelism, air spaced has high damage threshold. True zero order is better than zero order waveplate at all parameters and can be used at more critical application. When temperature bandwidth and wavelength bandwidth is not a problem for you, multi order is a better choice, it is cheap. If a zero order or true zero order waveplate does not offer retardance over a wide enough wavelength band, one solution is to use an achromatic waveplate, it has over hundreds of nanometers bandwidth.
Sometimes, the waveplate has unwanted Etalon effect, in order to eliminate this effect, Union Optic offer Wedge Waveplate to solve this problem. For detailed information, please contact us.
Due to the rotation activity of natural quartz crystal, it also can be used as polarization rotators so that the plane of input linearly polarized beam will be rotated at special angle which is determined by the thickness of quartz crystal. Left-handed and right-handed rotators can be offered by Union Optic now.
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