Longpass Filter

Longpass Filters transmit light with wavelengths above a set value and block all light below it. We stock a full range of Longpass Filters and offer customizations per your specs: ultra-narrow transition bands, cutoff depth ＞OD4, special angle applications, and unconventional thickness options.

描述.jpg

Material	Optical Glass, Fused Silica, Color Glass, etc.
Dimensional tolerances	+/-0.1mm
Surface Flatness	λ/10~1λ
Parallelism	< 30 arc seconds, <2 arc min
Surface Quality	10/5,20/10,40/20
Optical Density Error	+/-5%
Edge Chip	<0.1mm
Bevel	Protective bevel, or based on clients’ requests
Clear Aperture	>90%
Coating	According to customer's request

AOS Optics’ Longpass Filters are high-precision optical components engineered to transmit wavelengths above a set value while blocking shorter wavelengths, delivering exceptional performance for professional optical systems. Core advantages include wide cutoff bandwidth, deep cutoff depth (exceeding OD4), high transition steepness, superior transmittance, and excellent film firmness—ensuring stable light control, minimal interference, and long-term durability in harsh operating environments.

These versatile Longpass Filters are widely applied across key fields: spectral analysis (fluorescence excitation spectrum measurement, Raman spectroscopy, spectral grouping), astronomical observation, and medical testing instruments. They also excel in iris recognition, digital imaging, and multi-band detection systems, as well as stage lighting and beauty equipment. In imaging optical systems and machine vision setups, they effectively eliminate out-of-band interference light, significantly boosting imaging clarity and system sensitivity, becoming an indispensable component for high-precision optical applications.

工厂展示.jpg