660nm Bandpass Filter

660nm light is a red wavelength with strong tissue penetration, positioned at the boundary between visible and near-infrared spectra, offering both photochemical activity and biocompatibility.

  • Application 1: In biomedical phototherapy, 660nm bandpass filters precisely isolate this wavelength for low-level laser treatments, such as stimulating skin collagen production or enhancing mitochondrial energy metabolism.
  • Application 2: For plant growth monitoring, these filters eliminate ambient light interference, allowing only 660nm light to measure chlorophyll fluorescence parameters in leaves, which helps assess photosynthetic efficiency.
  • Application 3: Within fluorescence imaging systems, 660nm bandpass filters work with specific fluorescent markers to block excitation light noise, enabling clear capture of 660nm fluorescent signals for high-contrast biological sample imaging.
  • US Patent 10,656,089 - Systems, devices, and methods for time-resolved spectroscopy

    US Patent 10,656,089 - Systems, devices, and methods for time-resolved spectroscopy

    Context: A time-resolved spectroscopy (TRS) probe used for characterizing biological tissue in vivo (e.g., during surgery).

    Usage of Filter: The filter is used as a spectral selection element within the system's detection path, often part of a demultiplexer unit.

    Function: It isolates the specific 660nm wavelength band from the broader spectrum of light returned from the tissue (fluorescence or reflectance) before it reaches the detector.

    Result: Achieves precise tissue characterization (such as determining metabolic state or oxygenation levels) by ensuring the detector analyzes only the relevant "red" spectral signature, free from noise or overlapping signals from other fluorophores.

  • US Patent 5,490,505 - Signal processing apparatus and method (Pulse Oximetry context)

    US Patent 5,490,505 - Signal processing apparatus and method (Pulse Oximetry context)

    Context: A pulse oximetry sensor system designed to measure blood oxygen saturation (SpO2) while rejecting noise and motion artifacts.

    Usage of Filter: The filter is placed as an optical blocking/pass filter directly over the photodetector active area.

    Function: It is designed to pass the 660nm light emitted by the red LED (which is absorbed significantly by deoxygenated hemoglobin) while blocking ambient light and potentially separating it from the infrared (940nm) channel.

    Result: Achieves accurate SpO2 readings by providing a clean, high-contrast signal of the red light attenuation, which is mathematically compared to the infrared signal to calculate oxygen saturation.

  • US Patent 8,988,674 - Flow cytometer with spectral resolution

    US Patent 8,988,674 - Flow cytometer with spectral resolution

    Context: A multi-channel flow cytometry system used for analyzing and sorting cells based on fluorescent markers.

    Usage of Filter: The filter is used as an emission filter (specifically a 660/20 nm or similar narrow bandpass) in the fluorescence detection optics.

    Function: It isolates the fluorescence emission from specific red-excited fluorophores (such as APC, Alexa Fluor 647, or Cy5) while blocking the excitation laser light and emissions from other dyes.

    Result: Achieves high-sensitivity discrimination of cell populations, allowing researchers to identify specific immune cells or biomarkers without "crosstalk" interference from other detection channels.

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