Many applications require that researchers and scientists visualize minute concentrations of elements or compounds, or the changes in a continuous wavelength range. Meadowlark Optics line of Tunable Optical Filters allows the user to dissect an image into hundreds of individual wavelength images. Solar astronomers have used LC Tunable Filters for years (examples: imaging of solar flares and prominences or imaging the solar chromosphere) and now new applications in microscopy, spectroscopy, hyperspectral imaging and many other fields are being discovered and tested every day.
Design and construction of Tunable Optical Filters combines multiple areas of Meadowlark Optics expertise, including our Liquid Crystal Variable Retarders, instrumentation, fabrication and of course polarization. Our knowledge has led to designs that overcome many issues that have been overlooked in the past. For example, the retardance of a LC cell is sensitive to temperature and variations in the environment surrounding the device can lead to measurement errors. As a result we have mounted our Tunable Optical Filter inside a thermally controlled housing to preserve the tuning accuracy of the device.
If the specifications of our standard devices are not ideal for your application we are very interested in designing a custom Tunable Filter to exactly meet your needs. Choose the wavelength range, full width at half maximum (FWHM) of the transmission peaks, tuning resolution, angular field-of-view and a number of other requirements and Meadowlark Optics will design the system needed to complete your experiments. We even have designs that allow for a variable FWHM at a single wavelength! Please refer to the Tunable Optical Filter section of the catalog for more detail on these systems or call us to discuss your application requirements.
In an effort to offer more versatile products Meadowlark Optics has designed extremely broadband (650 to 2000 nm) polarizing beamcube based around our line of VersaLight wire grid polarizers. Laminating a Versa- Light polarizer inside two right angle prisms allows the component to exhibit the benefits of both the polarizer and cube. This means that you have an extremely broadband cube with a large acceptance angle that is easy to mount. These cubes can be made to transmit any polarization direction while reflecting the orthogonal polarization.
Most broadband polarizing beamcubes offer a useable wavelength range of 300-400 nm. The VersaLight beamcube offers a useable range of 1350 nm and can be used from 650-2000 nm without much variation in transmission or loss of contrast ratio. In fact, this cube has a transmitted contrast ratio of 500:1 or better through most of the useable wavelength range. It also pushes the limits of the field of view for polarizing beamcubes. The angular acceptance of the VersaLight cube is greater than ± 20°, compared to ± 3° for most thin film beamcubes, opening up many uses and applications that were not possible with thin film polarizer designs. This cube continues the Meadowlark Optics tradition of innovation and quality construction by providing better specs and more performance to our customers, allowing them to do and see things that were never possible before.
Over the years Meadowlark Optics has been asked to deliver some unique polarization components. Our reputation for quality and innovation has made us the company that many people turn to when they need a device that is not readily available.
Examples of these devices include a segmented polarizer that contained four different quadrants, where each quadrant had its polarization transmission axis in a different orientation. Another is an assembly of polarizing beamcubes that can take an input beam and separate it into multiple output beams with varying linear polarization directions. We also have manufactured an optically addressed spatial light modulator. Our engineers have spent years designing these components for various applications and they have the imagination and knowledge to build a component that will perfectly fit your needs. So, if you have an idea for a polarization component that you cannot find anywhere else, talk to Meadowlark Optics.