355nm 대역통과 필터

Context: This patent describes a system for purifying laser beams, specifically improving upon standard dielectric filters which often have lower transmission efficiency for UV wavelengths.

Usage of Filter: The bandpass filter is constructed as a holographic optical element (transmission grating) sandwiched between prisms. It is placed directly in the path of the incident laser beam.

Function: It diffracts the specific nominal wavelength (e.g., 355nm) through a specific angle to pass through an aperture, while undiffracted or differently diffracted wavelengths (noise/sidebands) are blocked by the mask.

Result: The system achieves an "ultra-pure" light beam with transmission efficiency approximately twice that of conventional dielectric filters available at the time, eliminating the need for complex realignment of folding mirrors.

Context: This patent details a fiber optic probe capable of performing both Fluorescence Lifetime Imaging (FLIm) and Raman spectroscopy simultaneously for medical diagnostics (e.g., identifying tissue types).

Usage of Filter: A small 355nm bandpass filter is positioned directly in front of the excitation fiber (the fiber delivering the laser light to the tissue).

Function: It acts as a "laser line clean-up" filter. It ensures that only the precise 355nm excitation light exits the probe tip, blocking any broadband fluorescence or Raman scattering that might have been generated inside the fiber optic cable itself as the light traveled to the tip.

Result: It prevents "fiber background" noise from overwhelming the extremely weak Raman signal returning from the tissue, significantly improving the signal-to-noise ratio for accurate disease detection.

Context: This patent describes advanced flow cytometry systems (like the Cytek Aurora or similar spectral analyzers) that use multiple lasers to analyze biological cells.

Usage of Filter: The filter is used in the detection module associated with the UV laser (355nm) excitation line.

Function: It isolates the fluorescence emission of specific UV-excited fluorochromes (such as BUV395 or DAPI) while blocking the intense 355nm laser reflection (Rayleigh scatter) and emissions from other lasers.

Result: It enables the "unmixing" of highly complex cellular data, allowing researchers to track significantly more cell markers simultaneously (high-parameter analysis) without signal cross-talk.