Telecentric F-Theta Lens vs Standard F-Theta Lens: Engineering Differences and Selection A telecentric F-theta lens vs standard F-theta lens comparison is mainly a question of beam geometry at the workpiece. Both lens types can be designed for a substantially flat scanning field and approximately linear…
F-theta distortion and field curvature are both field-dependent errors in a laser scan lens, but they fail in completely different ways. F-theta distortion is a position error: the focused spot lands somewhere other than where the scan angle says it should, while staying sharp. Field…
The relationship behind F theta lens focal length vs scan field is straightforward at first order: for an ideal F-theta mapping, the displacement of the focused spot is approximately proportional to effective focal length and optical scan angle. A longer focal length therefore produces a…
Choose zinc selenide (ZnSe) when the optic sits in a CO2 laser beam or has to transmit past about 14 µm. Choose zinc sulfide (ZnS) when the optic faces weather, sand, or rain, or when visible light and thermal infrared have to share one aperture.…
To specify the OD blocking range for a bandpass filter you need two independent numbers, not one: the depth of rejection, given as optical density (OD), and the wavelength interval over which that rejection is guaranteed. The interval is set by your system rather than…
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 a part of known dimensions, or when a calculated field does not agree with the number printed on a lens…
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…
Choose a Raman edge filter when you only need Stokes signal and you want to measure as close to the laser line as physically possible. Choose a notch filter when you need Stokes and anti-Stokes in the same acquisition, or when your excitation wavelength moves…
Choosing a bandpass vs longpass filter for machine vision is fundamentally a question of which wavelengths the camera should receive—and which wavelengths must be rejected. A bandpass filter transmits a defined spectral interval while attenuating wavelengths on both sides. A longpass filter blocks shorter wavelengths…
In an f-theta scanning system, spot size and input beam diameter are inversely related: double the collimated beam diameter at the lens, and the focused spot diameter halves. That single relationship is the reason a beam expander sits between almost every laser and every galvanometer…
In most catalogs, “laser line filter” and “laser cleanup filter” describe the same physical object: a narrow dielectric bandpass filter centered on a laser wavelength. The real distinction in a laser line filter vs laser cleanup filter comparison is not the coating, it is where…
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 the system. A 532 nm lens is not simply a higher-resolution version of a 1064 nm lens, and a 1064…
