Introduction to Longpass Filters
Longpass filters are specialized optical filters that transmit light with wavelengths longer than a specified cut-on wavelength while blocking shorter wavelengths. These precision components are essential in applications requiring selective wavelength control, such as spectroscopy, laser systems, and biomedical imaging.
How Longpass Filters Work
Longpass filters operate based on optical interference and diffraction. When light passes through the filter, its internal structure interacts with different wavelengths, allowing only those above the cut-on wavelength to transmit. Shorter wavelengths are either reflected or absorbed, ensuring precise spectral control.
Applications of Longpass Filters
Our longpass optical filters are widely used across industries:
Spectroscopy: Filters isolate specific wavelength ranges in UV-visible spectroscopy, enabling accurate measurement of absorption, transmission, or reflection spectra.
Laser Technology: They enhance laser beam quality by selecting desired wavelengths and eliminating unwanted ones, improving system stability.
Biomedical Imaging: In fluorescence microscopy, longpass filters enable selective observation of fluorescent signals, aiding in cellular and tissue analysis.
Other Fields: Applications include optical communications, environmental monitoring, and remote sensing.
Design Considerations
Selecting the right longpass filter involves:
Wavelength Range: Common cut-on wavelengths include 590nm, 600nm, 650nm, and 700nm.
Blocking Efficiency: High optical density ensures effective rejection of unwanted wavelengths.
Transmittance: Over 90% transmission in the passband for optimal performance.
Angle Dependence: Filters are designed to maintain performance at specific angles of incidence.
Physical Specifications: Size, shape, and mounting options tailored to application needs.
Why Choose Our Longpass Filters?
As a leading supplier of optical filters, we offer:
High Precision: Filters with steep cut-on edges and high transmittance for superior performance.
Custom Solutions: Tailored designs to meet specific wavelength and application requirements.
Industry Standards: Quality matching global benchmarks at competitive prices.
