Choosing an F-theta scan lens manufacturer is not simply a matter of matching a lens to a laser wavelength. An F-theta lens works as part of a complete scanning system. Its practical performance depends on the laser wavelength, input beam diameter, effective focal length, galvanometer…
Selecting a polarizing filter for machine vision glare reduction starts with one question that has nothing to do with the filter itself: is the glare a specular reflection from a dielectric surface, or from bare metal? Dielectric glare — plastic, glass, paint, wet surfaces, film…
Choosing a Raman longpass edge filter should start with two numbers: the excitation laser wavelength and the lowest Stokes Raman shift you need to measure. The nominal cut-on wavelength alone is not enough. A useful Raman edge filter must simultaneously provide strong rejection at the…
An aspheric lens reduces spherical aberration by changing its surface slope across the clear aperture, so that each annular zone refracts light by exactly the amount needed to reach one common focus. A spherical surface has the same radius everywhere, which makes the outer zones…
