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Apodizing Reflective ND Filters![]()
NDY10B Apodizing Filter NDYR20A Reverse Apodizing Filter NDYR20B Reverse Apodizing Filter NDY20A ![]() Please Wait
Features
Thorlabs’ Apodizing and Reverse Apodizing Filters are designed to augment the intensity profile of a beam to provide smooth intensity profiles and even illumination. An apodizing filter reshapes a Gaussian profile into a near-flat-top, constant-intensity beam, while a reverse apodizing filter reshapes a flat-top profile into a near-Gaussian intensity distribution. These filters are ideal for even illumination and condensing systems as well as improving the dynamic range of imaging systems. For instance, apodizing filters are employed in astronomy to differentiate low-intensity sources from brighter, neighboring sources. This technique even allows planets close to a bright star to be imaged. Both the apodizing and reverse apodizing filters are coated with a reflective metallic layer that has a near-Gaussian density distribution. For the apodizing filters, this distribution starts with a coated center and continuously falls off to the uncoated edge. For the reverse apodizing filters, the distribution starts with an uncoated center and continuously rises to the dark edge (see Graphs tab for more details). To prevent oxidation, Thorlabs recommends using these filters at temperatures below 100 °C. These Ø25 mm filters are available either unmounted or integrated into a mount featuring internal SM1 threads (1.035"-40) on one side and external SM1 threads on the other. If desired, a mounted filter can be removed from its housing by unscrewing the retaining ring that secures the filter to the mount. Thorlabs offers a range of spanner wrenches that are an ideal match to these retaining rings.
Optical DensityOptical density (OD) indicates the attenuation factor provided by an optical filter, i.e. how much it reduces the optical power of an incident beam. OD is related to the transmission, T, by the equation where T is a value between 0 and 1. Choosing an ND filter with a higher optical density will translate to lower transmission and greater reflection of the incident light. For higher transmission and less reflection, a lower optical density would be appropriate. As an example, if a filter with an OD of 2 results in a transmission value of 0.01, this means the filter attenuates the beam to 1% of the incident power. Apodizing Filters
Reverse Apodizing Filters
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Thorlabs’ Ø25 mm apodizing filters produce a near-flat-top intensity profile from a Gaussian input. These unmounted filters are compatible with any Ø1" optical mount capable of accepting a 1.0 mm thick optic (such as the LMR1, SCL03, or CP33). To prevent oxidation, Thorlabs recommends using these filters at temperatures below 100 °C. ![]()
Thorlabs’ Ø25 mm apodizing filters produce a near-Gaussian profile from a constant, flat-top input. These unmounted filters are compatible with any Ø1" optical mount capable of accepting a 1.0 mm thick optic (such as the LMR1, SCL03, or CP33). To prevent oxidation, Thorlabs recommends using these filters at temperatures below 100 °C. ![]()
Thorlabs’ Ø25 mm apodizing filters produce a near-flat-top intensity profile from a Gaussian input. These mounted filters featuring internal and external SM1 (1.035"-40) threading, making them compatible with any SM1-threaded mount (such as the LMR1 or TRF90). To prevent oxidation, Thorlabs recommends using these filters at temperatures below 100 °C. ![]()
Thorlabs’ Ø25 mm reverse apodizing filters produce a near-Gaussian profile from a constant, flat-top input. These mounted filters featuring internal and external SM1 (1.035"-40) threading, making them compatible with any SM1-threaded mount (such as the LMR1 or TRF90). To prevent oxidation, Thorlabs recommends using these filters at temperatures below 100 °C. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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