450nm Bandpass Filter

As part of the blue light spectrum, 450nm light features high photon energy, a narrow wavelength bandwidth, and specific positioning within the visible spectrum, making it ideal for optical systems requiring precise wavelength control.

  • Application 1:  (Fluorescence Imaging) In fluorescence imaging systems, the 450nm bandpass filter blocks stray light and transmits only 450nm excitation light, efficiently activating blue-responsive fluorescent markers (e.g., FITC derivatives) in samples to enhance imaging contrast and specificity.
  • Application 2:  (Environmental Monitoring) Used in environmental monitoring devices, this filter isolates 450nm characteristic absorption signals from water or gas samples to accurately detect pollutants with conjugated double-bond structures (such as polycyclic aromatic hydrocarbons, PAHs), enabling quantitative analysis of trace substances.
  • Application 3:  (LED Production Quality Control) Paired with spectrometers in LED manufacturing, the 450nm bandpass filter eliminates non-target wavelength noise, allowing precise measurement of blue LED chip parameters including peak wavelength, full width at half maximum (FWHM), and light intensity distribution to ensure compliance with wavelength accuracy standards for lighting and display devices.
  • US10971896B2 - Applications, methods and systems for a laser welding

    US10971896B2 - Applications, methods and systems for a laser welding

    Context: This patent describes high-brightness direct diode laser systems, specifically using blue laser diodes (approx. 450nm) for applications like welding copper and other metals. Blue light is absorbed much more efficiently by copper than infrared light.

    Usage of Filter: The 450nm filter (or wavelength-selective element like a Volume Bragg Grating, VBG) is placed in the optical path of the laser beam array.

    Function: It acts as a spectral locking or beam combining element. In some embodiments, it functions to lock the emission of the laser diode bars to a specific narrow band around 450nm to enable dense wavelength beam combining (DBC). Alternatively, in the sensor monitoring path, a 450nm bandpass filter allows the camera to specifically monitor the reflected laser light from the workpiece for seam tracking or focus control while blocking thermal radiation (IR).

    Result: Enables the generation of a high-power, high-brightness blue laser beam capable of spatter-free welding of highly reflective metals (like copper and gold) or precise process monitoring of the blue laser interaction.

  • US10952656 - Sensor head for non-invasive monitoring

    US10952656 - Sensor head for non-invasive monitoring

    Context: A sensor head for non-invasive monitoring of renal function (kidney health). The system detects the clearance of a fluorescent tracer agent (e.g., MB-102) injected into the body.

    Usage of Filter: A 450nm bandpass filter is used on the LED excitation source (or effectively as the LED's spectral cleanup filter).

    Function: The filter ensures that the light entering the skin is strictly within the 450nm excitation band (blue light) and does not contain any wavelengths that overlap with the tracer's emission band (approx. 560nm, green/orange).

    Result: Causes the tracer agent to fluoresce without "polluting" the detection channel with source light. The system then measures the decaying fluorescence signal over time to accurately calculate the Glomerular Filtration Rate (GFR) in real-time.

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