Product Descriptions：
| Characteristics: | 730nm Shortpass Filter |
| Type: | Interference type filter |
| Cut-off Wavelength(in mm): | 730nm ± 5nm |
| Average Transmittance(%) : | >90% |
| Surface Quality: | 60/40 scratch-dig |
| Optical Density (OD): | OD2-OD3 |
| Color: | Transparent |
| Shape: | Square, Round, Irregular Shape |
| Dimension(mm): | specified** |
| Thickness(mm): | specified*** |
| Substrate: | Ultra-clear glass,K9,BK7,B270,D2637T, Quartz Glass(Fused Silica) or other specified. |
Remark：
(1) Spectral range:380-1100nm
(2) Size customized: 86x86mm, 80x80mm, other can customized, max. 300x300mm
(3) Thickness available: 0.21、0.3、0.55、0.7、1.0、1.1、1.5、1.8、2.0、3.0mm…etc. |
Measured Spectral measurement
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Picture 1: 730nm Shortpass Filter Spectral measurement |
What is typical application for 730nm shortpass filters?
A 730nm shortpass filter is a professional optical component. It transmits light with wavelengths shorter than 730 nm, and blocks all light above this cut-off wavelength. Typical applications of 730nm shortpass filter:
- Imaging & Machine Vision: Filters out infrared stray light to prevent color distortion or contrast reduction, ensuring CMOS/CCD sensors capture true-to-life, clean images.
- Fluorescence Excitation Spectroscopy: Serves as a purification element in the excitation light path, ensuring that only pure short-wave excitation light reaches the sample while blocking long-wave stray light, thereby improving signal-to-noise ratio and detection accuracy.
- Raman Spectroscopy: Filters out low-frequency noise from the excitation light and Rayleigh scattering, allowing only the weak Raman signal to pass through.
- Medical & Biometric Identification: Used in PCR fluorescence detection and medical diagnostic instruments to isolate unnecessary infrared light and ensure detection accuracy; in biometric systems such as iris recognition and facial recognition access control, it filters out infrared interference to improve recognition accuracy.
- Stage Lighting: Extracts pure short-wave color components from white light to achieve specific lighting effects.
What is key parameter when choose for suitable shortpass filters?
When selecting shortpass filters, normally the following factors need to be taken into consideration：
- Cut-off Wavelength: refers to the designated intermediated wavelength (e.g. 650nm) at transition from transmission to reflective zone, and measure at 50% transmittance.
- Peak or Average Transmittance(in %): typically ≥90%, Higher transmittance might need Anti-reflective(AR) coating.
- Blocking rate: usually in terms of optical density(OD), OD2-OD3 for standard and higher blocking rate will be OD4-OD6 per requirement.
- Angle of Incidence (AOI): AOI need to be considered 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:
760nm Shortpass Filter for machine vision, fluorescence spectroscopy, Raman spectroscopy, medical devices, and stage lighting, 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.
