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Air Spaced Zero Order Waveplates

Featured Product from Hangzhou Shalom Electro-optics Technology Co., Ltd.

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  • Operational wavelengths range from 200nm to 2000nm (Quartz), 190nm to 7000nm (MgF2)

  • Air spaced double-plate structure

  • High temperature and wavelength stability

  • High damage threshold (>500 MW/cm2) supporting high power lasers

  • Various retardations: Half, quarter, octadic, or full retardations 

  • Both off-the-shelf and custom versions are available


A Zero Order Waveplate consists of two waveplates made from Quartz or Magnesium Fluoride, with their optical axes orthogonally aligned. Unlike multiple order waveplates which produce the desired retardation together with a surplus of several wavelength shifts, the terminal net retardation gained from a zero order waveplate is the difference between the two individual retardations respectively made from the two constituent waveplates, this measure effectively reduces the responsiveness of retardation against wavelength. Therefore zero order waveplates are substantially far less sensitive to temperature and wavelength shifts than their multi-order counterparts and exhibit better stability and reliability. 

Hangzhou Shalom EO offers Air Spaced Zero Order Waveplates made from high-quality Single Crystal Quartz, or MgF2, with Quarter, Half, Octadic, or Full Wavelength Retardation. The operational wavelengths broadly range from 200nm to 2000nm (Quartz), 190nm to 7000nm (MgF2). The air-spaced modules, with a construction of a designed air gap in between the two constituent plates, feature exceptionally promoted damage thresholds suitable for high-power laser systems. The products are available in both off-the-shelf and custom versions. As for the off-the-shelf air spaced zero order waveplates, 26 specifications with standard 18mm apertures and 25.4mm mounts are available, with the essential parameters and curves individually listed in our product catalog and on our website for browsing-through and quick selection. Shalom EO could also provide custom products tailored according to your requirements.


FAQs about How to Use A Waveplate:

Below are some frequent problems you might encounter during the usage of waveplates. Engineers from Shalom EO here offer a few usful tips.

How to find the axes of a waveplate?

Finding the fast axis of each waveplate is a critical step when using the waveplates. The mounted waveplates offered by Shalom EO are all designed with their fast axes indicated as a straight light on the mount. While the fast axis of the unmounted versions is all marked directly on the waveplates. However, if it happens that the axes are not indicated or the indications are blurred, there is a simple method to help you find the axes which apply for waveplates with all values of retardations. First, place a polarizer in front of the laser device, tilt the polarizer until the light is extinct, then interpose the waveplate between the laser device and the polarizer, rotate the waveplate so that the eventual light output is still extinct——and viola! you have found an axis successfully.

How to make some adjustments?

Additionally, It might happen that you find the waveplates you bought might not produce exactly the intended retardation. There are plenty of reasons: e.g. the waveplates are not designed for your wavelength of interest, or there are external factors such as temperature affecting the retardation. The small deviations could be modified by rotating the plane of polarization towards the fast or slow axis of the waveplate. Moving toward the fast axis reduces the retardation while moving towards the fast axis raises the retardation. Try both directions and keep checking the improvements using polarizers.