GIAI Photonics
This is the GIAI past corporate news section, which brings together various activities and exhibitions that GIAI has participated in, the latest industry communication trends, corporate notifications, holiday details, etc. You are welcome to read!optical filters, optical coatings, interference filters, bandpass filters, longpass filters, shortpass filters, AR coatings
Absorptive and reflective neutral density (ND) filters both reduce light intensity, but they manage rejected optical energy differently. Absorptive ND filters primarily convert light energy…
Read articleHow are coating materials selected for a wavelength range? Engineers first find materials that are transparent across every wavelength where the coating must transmit or…
Read articleA coating that meets its spectrum at the center of a part can still fail at the edge of the clear aperture. The reason is…
Read articleMirror surface quality affects scatter through several different surface features. Microroughness sends a small fraction of the reflected light into a diffuse halo, and that…
Read articleA front surface mirror reflects at the coating; a back surface mirror reflects after a double pass through the substrate. An uncoated glass front face…
Read articleInternal transmittance falls exponentially with path length, τ = exp(−αd); doubling thickness squares τ, and the loss doubles only while absorption is weak. Uncoated glass…
Read articleA useful custom optical window specification should define more than material and dimensions. At minimum, it should describe the operating wavelength, substrate or material grade,…
Read articleScratch-dig limits discrete local defects; surface roughness is the RMS height of fine texture across the whole surface. The MIL-PRF-13830B scratch number is a visibility…
Read articleA cone half angle shifts an interference filter's spectrum toward shorter wavelengths and softens its edges; a pure tilt only shifts it. With the chief…
Read articleA beamsplitter does not treat s- and p-polarized light the same way. At any angle other than normal incidence, the reflectance of a surface or…
Read articleChoose fused silica when the window must work in the deep UV, must not disturb polarization or wavefront, or must survive fast thermal transients; choose…
Read articleChoosing a Raman longpass edge filter should start with two numbers: the excitation laser wavelength and the lowest Stokes Raman shift you need to measure.…
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