808nm Bandpass Filter

An 808nm bandpass filter allows only light centered around the 808nm wavelength to pass through while significantly reducing the transmission of other wavelengths.

  • Application 1: In infrared spectroscopy, it helps isolate the 808nm wavelength to accurately analyze the absorption characteristics of samples containing specific chemical bonds that interact with this wavelength.
  • Application 2: For 808nm - pumped solid - state lasers, the filter ensures that only the 808nm pump light reaches the laser medium, optimizing the laser's pumping efficiency and output performance.
  • Application 3: In bio - imaging, when using 808nm - emitting fluorescent probes, the filter enables the clear visualization of the probes by filtering out background light and only allowing the 808nm fluorescent signal to be detected.
  • US7982869B2 - Compact, Low Cost Raman Monitor

    US7982869B2 - Compact, Low Cost Raman Monitor

    Context: This patent describes a portable Raman spectroscopy system designed to detect chemical substances (e.g., toxins, pollutants) by analyzing their molecular vibrations. The system uses a laser diode to excite the sample.

    Usage of Filter: The 808nm bandpass filter is used as a Laser Line Clean-up Filter in the laser source module.

    Function: Diode lasers often emit low-level "spontaneous emission" (noise) at wavelengths other than the main 808nm peak. The bandpass filter transmits only the sharp 808nm center wavelength and blocks the adjacent spectral noise.

    Result: This achieves a high Signal-to-Noise Ratio (SNR). By eliminating the broadband noise from the laser source, the system prevents that noise from overlapping with the weak Raman scatter signals returning from the sample, ensuring accurate chemical identification.

  • US10598914B2 - Enhancement of Video-Rate Fluorescence Imagery

    US10598914B2 - Enhancement of Video-Rate Fluorescence Imagery

    Context: This patent details a fluorescence imaging system operating in the "Second Near-Infrared Window" (NIR-II), which allows for deep tissue imaging with high clarity.

    Usage of Filter: The bandpass filter is used as an Excitation Filter within the optical train.

    Function: The system uses an 808nm laser to excite specific fluorophores (like carbon nanotubes or quantum dots) inside biological tissue. The filter ensures that the illumination is strictly confined to the 808nm band.

    Result: This achieves enhanced image contrast and depth. By strictly confining the excitation light, the system minimizes "autofluorescence" (glowing) from surrounding tissues and ensures that the detector only receives the signal from the targeted fluorophores, allowing for clear visualization of blood vessels or tumors deep under the skin.

  • US10996170B2 - Device and Method for Imaging Shortwave Infrared Fluorescence

    US10996170B2 - Device and Method for Imaging Shortwave Infrared Fluorescence

    Context: This patent focuses on medical imaging of vasculature (blood vessels) and cardiac function using shortwave infrared (SWIR) sensors.

    Usage of Filter: The 808nm bandpass filter acts as a Source Conditioning Filter for the diffuse illumination system.

    Function: The patent describes emitting "diffuse 808 nm excitation light" towards a beating heart. The filter conditions this light source to prevent spectral broadening that could leak into the detection band (which is typically >1000nm).

    Result: This achieves high-speed, real-time angiography. The precise spectral control allows the system to capture video (e.g., 9.7 frames per second) of a beating heart with fine resolution (~30 µm), enabling doctors to see blood flow in real-time without signal interference from the excitation source.

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