1.Product Descriptions :
| Characteristics: | 620nm Longpass filter |
| Type: | Longpass filter |
| Central Wavelength (CWL): | 620nm ±3nm |
| Transmittance: | >85% or specified |
| Optical Density： | OD2-OD4 or specified |
| Surface Quality: | 60/40、80/20 scratch-dig |
| Color: | Red |
| Shape: | Round, Square, Custom Shape |
| Dimension: | specified |
| Thickness: | specified |
| Substrate: | Ultra-clear glass,K9,BK7,B270,D2637T, Quartz Glass(Fused Silica) or other specified |
| Spectral range: | 620-1100nm even wider |
| “Remark Spectral range:380-1100nm *Customized capability: 380-2500nm, stock for 10nm intervals. **Common for 86x86mm, 80x80mm, other can customized, max. 300x300mm *** Thickness available: 0.21、0.3、0.55、0.7、1.0、1.1、1.5、1.8、2.0、3.0mm…etc. | |
2. Measured Spectral curve
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Picture 1: LP620nm Spectral Curve |
What is a 620nm Longpass Filter and what are its typical applications?
A 620nm Longpass Filter is an optical component that transmits light with wavelengths longer than 620nm while cutting off light with shorter wavelengths. It is mainly used in various fields such as fluorescence microscopy, Raman spectroscopy, biomedical imaging, machine vision, laser systems, spectral analysis, stage lighting, and police multi-band detection.
What is key parameter when choose for right Longpass filters?
When selecting a 620nm Longpass Filter, we need to consider the following factors. First, cut-on wavelength accuracy. Second, transmission requirements. For weak signal detection, it is necessary to choose a filter with a transmission rate of >90%. For general applications, >85% is usually sufficient. Third, blocking depth. The deeper the blocking depth, the stronger the blocking capability. Fourth, edge steepness. If the signal light and the interfering light are very close in wavelength, an edge steepness of less than 15-20nm is generally required. Fifth, substrate material type. Sixth, dimensions. Seventh, incident angle. Eighth, coating requirements. If higher transmission is required, a filter with an anti-reflection (AR) coating should be selected.
Shenzhen Hengda Liyuan Optoelectronics introduced advanced optical technology that apply depositing nanomaterials 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. Liyuan optoelectronics have been focus on optical coating for more than 17 years and offer one-stop optical filters solution including Narrow Bandpass Filters, IR cut-off Filters, Longpass & Short Filters, Notch Filters, ND filters, Star filters and Optical sapphire block.
other Longpass filters in stock from Liyuan Optoelectronics: LP430 LP500 LP560 LP600 LP650 LP800…etc.
