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A dichroic beam splitter is an optical device that splits a beam of light into two separate beams based on the wavelength of the light. The term "dichroic" refers to the property of selectively reflecting or transmitting light of certain wavelengths.

The 450nm dichroic beam splitter is specifically designed to split light at a wavelength of 450 nanometers (nm). This wavelength corresponds to blue light in the visible spectrum. When a beam of light at 450nm is incident on the beam splitter, it will be divided into two beams: one beam that is reflected and one beam that is transmitted.

The reflected beam will contain light of other wavelengths that are not close to 450nm, while the transmitted beam will primarily consist of light at or around 450nm. This property makes the 450nm dichroic beam splitter useful in applications where separation or manipulation of blue light is required, such as in laser systems, fluorescence microscopy, or optical communications.