Collection: 905nm Bandpass Filter

Properties of 905nm light:

  • Invisible: Our eyes cannot detect 905nm light because its wavelength is longer than what our cones are sensitive to.
  • Relatively good penetration: Compared to shorter wavelengths of IR light, 905nm can penetrate deeper into certain materials like water and biological tissues.

Applications of 905nm light:

  • LiDAR (Light Detection and Ranging): LiDAR systems use pulsed lasers to measure distance. A laser diode emitting at 905nm is a common choice because it offers a good balance between eye safety, penetration depth, and commercially available detector technology. LiDAR applications include self-driving cars, robotics, and drone navigation. Here's a scientific illustration:

Imagine a self-driving car equipped with a LiDAR system using a 905nm laser. The LiDAR emits short pulses of 905nm light, which bounce off objects in the environment (cars, pedestrians, traffic signs). By measuring the time it takes for the light to return, the LiDAR system can calculate the distance to those objects and create a 3D map of the surroundings. The 905nm wavelength offers an advantage here because it can penetrate fog or dust better than shorter visible wavelengths,allowing the LiDAR to function in less than ideal conditions.

  • Medical Therapy: Some low-level laser therapy devices use 905nm light for pain relief and promoting tissue healing. The specific mechanism of action is still under research, but the 905nm wavelength may be beneficial due to its ability to penetrate deeper into tissues.

  • Optical Communications: In certain applications, 905nm light can be used for short-distance optical communication through fiber optic cables. This is because this wavelength experiences less signal attenuation compared to shorter wavelengths in some types of fibers.

Safety Considerations:

While 905nm light is generally considered eye-safe at low power levels, it's important to follow safety guidelines whenever working with lasers. Never stare directly into a laser beam, regardless of wavelength.

By understanding the properties of 905nm light, we can harness its unique capabilities for various applications in science,industry, and medicine.

905nm Bandpass Filter

26 products

Applications for 905nm Bandpass Filter

Night vision and security: 905 nm LEDs do not emit the faint red glow associated with lower near-IR LED wavelengths, making them ideal for covert surveillance and night vision applications. A bandpass filter with a 905 nm CWL can block the ambient light and pass the reflected 905 nm LED light, allowing full color imaging during the day and infrared imaging at night.

Biomedical imaging and analysis: Some biomolecules, such as NADH and FAD, have fluorescence emission peaks around 905 nm when excited by near-UV light. A bandpass filter with a 905 nm CWL can block the excitation light and pass the emission light, enabling the detection and quantification of these molecules in biological samples

Laser range finding and distance measurement: Some laser diodes and photodiodes have peak emission and detection wavelengths around 905 nm, making them suitable for laser range finding and distance measurement applications. A bandpass filter with a 905 nm CWL can isolate the laser signal from the background noise and improve the accuracy and reliability of the measurement

Difference between 905nm and 940nm

The difference between 905nm and 940nm is mainly in the visibility and the performance of the infrared light. 905nm and 940nm are both near-infrared wavelengths that can be used for night vision, security, biomedical imaging, and laser range finding applications. However, there are some advantages and disadvantages of each wavelength.

  • Visibility: 905nm LEDs emit a faint red glow that can be slightly perceived by the human eye, while 940nm LEDs are virtually invisible and do not produce any red glow. This makes 940nm more suitable for covert and stealth operations, where the red glow could give away the location of the light source or the user. However, some 905nm LEDs are designed to minimize the red glow and make it less noticeable.
  • Performance: 905nm LEDs have a higher output power and a longer range than 940nm LEDs, because they are closer to the peak sensitivity of most IR cameras. This means that 905nm LEDs can produce a brighter and clearer image at night, and they are less likely to create blurry images than 940nm LEDs. However, some cameras are specially designed to be sensitive to 940nm wavelength, and they can achieve a comparable performance with 940nm LEDs.

In summary, 905nm and 940nm are both useful wavelengths for infrared applications, but they have different trade-offs between visibility and performance. Depending on the specific needs and preferences of the user, either wavelength could be a better choice.

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