What Is Extinction Ratio in a Polarizer?
Extinction ratio is the ratio between the transmittance a polarizer gives to the polarization state it passes and the transmittance it gives to the orthogonal…
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Optical Materials & Infrared
GIAI’s latest optical information display area contains a variety of news and information on popular science explanations, working principles, usage tips, etc. of various optical filters, prisms, lenses and components. There is always one that interests you.
Dielectric Coating vs Metallic Coating
When specifying a mirror, beamsplitter, filter, or other coated optical component, choosing between a dielectric coating and a metallic coating is not simply a question…
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F-Theta Scan Lens Manufacturer | Custom Scan Optics
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…
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How to Verify Laser Line Rejection for Raman Spectroscopy
Verifying laser line rejection for Raman spectroscopy means proving three separate things, not one: the optical density at the laser wavelength under the angle and…
Read articleWhat Causes Ghost Images in Beamsplitters?
A ghost image in a beamsplitter is a second, weaker image formed by light that reached the detector along an unintended optical path inside the…
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ZnSe Lens Manufacturer: Grades, Tolerances & Coatings
Choosing a ZnSe lens manufacturer comes down to three things you can actually verify: the grade and traceability of the chemical vapor deposition (CVD) zinc…
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Aspheric Lens vs Achromatic Lens: How to Choose
An aspheric lens corrects spherical aberration in a single element. An achromatic lens corrects chromatic aberration by combining two glasses with opposing dispersion. The aspheric…
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Flat-Top vs Gaussian Bandpass Filter: How to Choose
A flat-top bandpass filter holds near-peak transmission across the whole passband and then drops steeply at both edges. A Gaussian bandpass filter reaches maximum transmission…
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905 nm vs 1550 nm LiDAR Optical Filters
Choosing between 905 nm vs 1550 nm LiDAR optical filters is not simply a matter of moving the center wavelength of the same bandpass filter.…
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F-Theta Scan Field Size Calculation
Engineers usually reach the question of how to calculate F-theta scan field size at one of two moments: when a marking field has to cover…
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1064nm vs 532nm F-Theta Scan Lens
A 1064nm vs 532nm F-theta scan lens comparison starts with a simple rule: the scan lens must be designed for the laser wavelength used by…
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Germanium vs ZnSe Infrared Window
Choose a germanium infrared window when you need a rugged, visible-blocking aperture for an 8 to 14 µm thermal imager that stays below roughly 100…
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