500nm Bandpass Filter

Positioned in the green region of the visible spectrum, 500nm light possesses specific photon energy and wavelength concentration, enabling selective interaction with target materials and penetration through specific media.

  • Application 1: (Fluorescence Microscopy) In fluorescence microscopy, the 500nm bandpass filter precisely isolates target emission signals (e.g., green fluorescent protein, GFP) by blocking stray excitation light, significantly enhancing imaging contrast and resolution for detailed cellular observation.
  • Application 2: (Water Quality Monitoring) Used in environmental monitoring devices, this filter separates the characteristic absorption/emission light of chlorophyll-a around 500nm in water samples, facilitating accurate quantification of algae concentration by eliminating interference from irrelevant wavelengths.
  • Application 3: (Spectroscopic and Industrial Inspection) When integrated with optical instruments such as fiber optic spectrometers, the 500nm bandpass filter extracts targeted wavelength signals from complex light sources, enabling critical applications including semiconductor surface defect detection and biomolecular recognition in biosensor technologies.

500nm Bandpass Filter
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US4340307A - Bichromatic spectrophotometer with wavelength reversal

US4340307A - Bichromatic spectrophotometer with wavelength reversal

Context: Chemical analysis and medical diagnostics using spectrophotometry to measure the concentration of substances in a solution.

Usage of Filter: The filter is used as one half of a "filter pair" (e.g., a 500nm sample filter paired with a reference filter) mounted on a rotating chopper wheel or swappable mechanism.

Function: It isolates the specific absorption wavelength (500nm) required to detect the target chemical "sample" while alternating with a "reference" wavelength to establish a baseline.

Result: Achieves highly accurate chemical concentration measurements by electronically canceling out turbidity, bubbles, or lamp fluctuations that would otherwise distort the reading.

US4184749A - Wide angle narrow bandpass optical filter system

US4184749A - Wide angle narrow bandpass optical filter system

Context: Optical guidance systems and receivers that need to detect specific light signals over a wide field of view (e.g., 60°) without "blind spots."

Usage of Filter: The bandpass filter is integrated as a curved or spherical shell element sandwiched between concentric lenses, rather than a flat plate.

Function: It admits light only within the narrow target band (centering around the 480nm–530nm range, including 500nm) regardless of the incoming angle of the light, preventing the "blue shift" distinct to flat filters when tilted.

Result: Maintains a high signal-to-noise ratio for detecting laser or beacon signals from wide angles, preventing the system from losing the signal at the edges of its vision.

US4829597A - Low solar background, high sensitivity active atomic resonance filter for underwater laser communications

US4829597A - Low solar background, high sensitivity active atomic resonance filter for underwater laser communications

Context: Satellite-to-submarine communication systems where signals must travel through ocean water.

Usage of Filter: Used as a "pre-filter" or "pump" selector operating within the "Jerlov blue-green window" (450nm–550nm).

Function: The filter strictly blocks broad-spectrum solar background noise (sunlight) while transmitting the specific 500nm-region laser signals that can penetrate seawater with minimal attenuation.

Result: Enables the detection of weak communication signals deep underwater during daylight hours, which would otherwise be drowned out by the sun's reflection on the ocean surface.

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