A dichroic mirror is a wavelength-selective optical component designed to reflect one spectral region while transmitting another. Unlike a conventional mirror that is intended to reflect a broad wavelength range, a dichroic mirror uses a carefully designed multilayer dielectric coating to control how different wavelengths…
In the intricate realm of optics, a beam splitter stands as a fundamental and versatile optical component. It plays a pivotal role in manipulating light, enabling a wide array of applications across various scientific, technological, and industrial fields. Definition and Working Principle A beam splitter…
Use a V-coat when the optic sees one laser line and you need the last fraction of a percent of transmission. Use a broadband anti-reflection (BBAR) coating when the optic has to work across a spectral band, or when a second wavelength such as an…
An ultra narrow bandpass filter is used when an optical system needs to transmit a tightly defined wavelength region while strongly attenuating light outside that region. Typical ultra narrow bandpass filter applications include laser-line cleanup, LiDAR and active optical sensing, selected fluorescence channels, analytical spectroscopy,…
Transmission, reflection, and absorption describe three fundamental ways light interacts with an optical material or component. Transmission is the portion of incident optical power that passes through the component, reflection is the portion returned from its surfaces or optical structure, and absorption is the portion…
Thermal lensing in germanium optics is the change in optical power that occurs when absorbed radiation heats a germanium element non-uniformly, creating a radial temperature gradient that is converted into a refractive index gradient through the material’s thermo-optic coefficient. The heated element behaves as if…
A telecentric lens keeps image magnification essentially constant while the object moves along the optical axis, within a defined telecentric range. A conventional imaging lens does not: as the object moves closer or farther, its image grows or shrinks. That single difference decides most selection…
Surface flatness and wavefront error are related, but they are not interchangeable specifications. Surface flatness describes how much a nominally flat optical surface departs from an ideal plane. Wavefront error describes how much an optical component or system changes the shape of an optical wavefront…
A beamsplitter is often described simply as an optical component that divides one incident beam into transmitted and reflected paths. In an actual optical system, however, an important question comes first: Should the splitting behavior depend on polarization? That question separates two major categories: polarizing…
Optical prism, as an important component in the field of optics, plays an irreplaceable role in various optical instruments due to its diverse structures and functions. This article will explore in depth the classification of optical prisms and their unique role in various application scenarios.…
For a symmetric all-dielectric filter on a non-absorbing substrate, used near normal incidence at low optical power, flipping the part does not change the transmitted spectrum. Transmittance through a non-absorbing multilayer is the same in both propagation directions at the same angle of incidence. Optical…
The practical difference between OD4 vs OD6 optical filter blocking is a factor of 100 in transmitted unwanted light. OD4 permits a maximum transmittance of 10-4, or 0.01%, while OD6 corresponds to 10-6, or 0.0001%. That difference can be important when a detector must separate…
