Apertures

In this section we list a number of slits, pinholes and iris diaphragms. All three are useful in providing a defined or reduced physical aperture to allow only a specific amount of light through a system. The slits and pinholes are small enough that they will act as quasi-diffraction sources or spatial filters for a number of applications

We offer both ruled and air slits. The ruled slits are provided on quartz substrates for durability and strength. Ruled slits are often preferred since dust problems are somewhat reduced when compared to a true open aperture. On the other hand, the substrate does limit the range of transmission and they are intrinsically more fragile.

The pinholes are precision etched in either stainless steel or copper foil. The copper foil version allows for higher power levels, as the copper is able to dissipate heat more effectively than the stainless steel versions.

Diaphragms are made from a series of interlocking leaves which open and close in such a way that an quasi-circular aperture is formed. Diaphragms are extremely useful in empirically determining the need for aperture stops to reduce scatter and stray light. Some of our iris diaphragms use a two-iris system to allow them to be closed completely to a zero aperture.

 

The best advice we can offer about cleaning pinholes and slits is to work scrupulously to avoid getting them dirty. Having said this, dirt will sometimes accumulate in these tiny apertures and needs to be cleaned out. We suggest first trying to clean them with a gentle stream of a dry clean neutral gas. If this fails to dislodge the particle, we would then suggest immersion in alcohol or the use of an ultrasonic bath. Acetone should be avoided as it will dissolve the cement used in the mounted versions of these devices.

 

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