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Super Achormatic Waveplates

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

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  • Exceedingly flat retardation over a broad wavelength range

  • Wavelength range: 325-1100nm and 600-2700nm (quarter waveplate), 310-1100nm and 600-2700nm (half waveplate), or custom wavelength range

  • Cemented construction (NOA61 cemented)

  • 25.4mm (1 inch) mounter configured

  • AR coatings on the surfaces


Super Achromatic Waveplates are the high-performance version of Achromatic Waveplates with superior broadband functions, consisting of three Quartz single plates and three Magnesium Fluoride (MgF2) single plates. The working principle of super achromatic waveplates is the same as that of normal achromatic waveplates: Through aligning the fast axes and slow axes of the constituent waveplates made from two birefringent materials, of which the changes in the birefringent indices (against wavelength) are complementary, the sensitivity of retardation to wavelength is significantly reduced. Adding up six waveplates, Shalom EO develops zero-order super achromatic waveplates that generate exceedingly flat retardation over a broad wavelength range and drastically reduce the effects of external factors, therefore are of excellent reliability under various operating conditions. Click here to check the Retardation Via Wavelength Curves. Super Achromatic Waveplates are a kind of broadband waveplates for applications across the ultra-violent spectral to the MWIR spectral. As for LWIR applications.

The most widely applied waveplates are Half Waveplates and Quarter Waveplates. Hangzhou Shalom EO offers quarter or half retardance super achromatic waveplates with three standard wavelength ranges from the Ultraviolet to the Infrared spectral: 325-1100nm and 600-2700nm (for quarter waveplates), or 310-1100nm and 600-2700nm (for half waveplates), and conventionally the waveplates are configured with 25.4mm mounts.  If you require other wavelength ranges or designs, contact our tech support and Shalom EO could arrange the custom service for you.

The waveplates adopt a cemented structure, the six constituent plates are cemented using NOA61 (Norland Optical Adhesive 61), an optical grade solid adhesive compliant to the Federal Specification MIL-A-3920, which is solvent-resistant and extremely temperature-durable and is oriented for the best usage of these super achromatic waveplates. The surfaces of the plates are AR coated to ensure high transmission and low power loss of the system. 


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.