Bandpass Filter reflecting Bragg grating (RBG)

Imagine a special mirror made of glass that only lets a very specific color of light pass through, and reflects all the other colors. That’s basically what a Bandpass Filter is. It’s used to clean up messy laser light, making it a very pure color.

These filters are super precise, dealing with tiny differences in color, as small as 50 picometers. They work with visible light and the light just beyond what we can see (near-infrared).

In a technique called Raman spectroscopy, these filters are used with another type of filter (Notch Filters) to see very subtle changes in the light’s color. This lets scientists measure things that are very close to the laser’s original color, down to 5 cm-1.

These filters are tough! They can handle extreme conditions like high power light and hot temperatures, and they don’t easily break down over time.

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Here’s a breakdown of technical details in simpler terms:

Think of it like choosing a lightbulb:

Center Wavelength: These are the standard “colors” of light the filter works best with. Think of these as the most common lightbulb colors. They’re measured in nanometers (nm). So, you can get filters for light that’s 405nm (violet), 488nm (blue), 532nm (green), and so on.
Available Custom Wavelengths: If you need a very specific “color” of light that’s not standard, they can make it for you. This is like ordering a custom-made lightbulb. The list shows all the other colors they can make.
Spectral Bandwidth (FWHM): This tells you how “pure” the color of light is that gets through the filter. A value of less than 5 cm-1 means the filter is very precise, letting through a very narrow range of light.
Diffraction Efficiency: This tells you how much of the desired light actually passes through the filter. A value of over 90% means most of the light gets through, so it’s very efficient.
Lateral Dimensions: This is simply the size of the filter, like how big the lightbulb is. You can get them in two sizes: 5×5 millimeters and 11×11 millimeters.
Deflection Angle: This tells you how much the filter bends the light as it passes through. In this case, it bends it by 20 degrees.

What makes these filters really good:

Super Precise Color Filtering: They are excellent at picking out and letting through only the exact color of light you want.
Built to Last: They’re very stable and don’t break down or lose their effectiveness over time, even in tough conditions.
Handles Powerful Light: They can work with extremely strong light, even over 1,000 watts.
Can Handle Constant Power: They can continuously handle high levels of power, more than 20 watts.
Resistant to High Energy: They can withstand bursts of very high energy light.
Works with Any Light Direction: It doesn’t matter how the light is oriented (polarized), the filter will work the same.
Keeps Light Focused: The light that comes out is very clean and focused, almost perfect.

Tags: Bandpass filter RBG, Bandpass Filter reflecting Bragg grating (RBG), Bragg grating bandpass filter, High power RBG filter, Narrowband RBG filter, RBG filter for Raman spectroscopy., RBG optical filter, Reflective Bragg grating filter, Tunable RBG filter

What these filters are used for:

Seeing tiny changes in light (Terahertz Raman spectroscopy): They help scientists study materials by looking at very subtle shifts in the color of light, even the smallest ones.
Cleaning up laser light: They make laser beams more pure and remove unwanted “noise” or extra colors.
Improving Raman laser diodes: They help make Raman lasers work better by filtering out unwanted light (ASE).
Identifying colors of light: They are used to detect and measure different colors of light.
Fine-tuning light colors: They can be adjusted to let through very specific colors of light, which is useful for very precise measurements.

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