Product Descriptions:
Characteristics: | 395nm longpass filter |
Type: | Interference filters |
Cut-off Wavelength (nm): | 395nm |
Average Transmittance(%): | 90% |
Optical Density： | OD2 |
Surface Quality: | 60/40 scratch-dig |
Color: | Transparent |
Shape | Square or customized |
Dimension(mm): | 86x86mm or customized |
Thickness: | 1.0mm or customized |
Substrate: | Optical glass |
Remark：Support customized. | |
What is the 395nm longpass filter?
The 395nm long wavelength pass filter is a cut-off type filter, commonly referred as 395nm cut-off filter or UV cut-off filter. It allows light with wavelengths greater than 395nm to pass through efficiently, while blocking or significantly attenuating short-wave ultraviolet light less than 395nm. It is widely used in fields such as fluorescence detection, machine vision, fluorescence microscopy, and laser protection.
What is key parameter when choose for suitable Longpass filter?
When selecting a Longpass Filter, normally the following factors need to be taken into consideration：
- Cut-Off Wavelength: it is one of the most important parameters, typically defined as the wavelength transmittance at 50% .
- Average or Peak transmittance: usually average transmittance ≥90%, higher transmittance e.g. 92% or 95% on average or specific single point need to definite and communicate with manufacturer, higher transmittance need to additional AR coating.
- Blocking rate: usually expressed in terms of optical density(OD), OD2-OD3 for standard and higher will be OD4-OD6 per requirement
- Angle of Incidence (AOI): AOI need to be consider as Interference Filter is angle sensitive, 0° AOI by default, other AOI e.g. 30/45° need to be specified.
- Physical and environmental requirement: Substrate type, dimensions and thickness, surface quality, and environmental durability.
Related products:
LP420, 420nm Longpass Filter, Support Customized
Shenzhen Hengda Liyuan Optoelectronics introduced advanced optical vacuum technology that apply depositing nano-materials through ion-assisted evaporation onto a multilayer hard film in a high vacuum environment which coating layer is firm and has good tightness, and small bandwidth drift. Besides, Liyuan optoelectronics have been focus on optical coating for more than 17 years ,and the company offer one-stop optical filters solution including Narrow Bandpass Filters, IR cut-off Filters, Longpass Filters, Shortpass Filters, Notch Filters, ND filters, Star filters and Optical sapphire block.
Remark：Because the interference type filter varies its performance at different angles, the spectral parameters usually determine its appearance color; moreover, the pictures in this link may originate from various shooting angles, so the actual color should therefore rely on the final spectral parameters required as the standard.
