Custom Optical 405nm Notch Filter Glass

Custom Optical 405nm Notch Filter Glass     A Custom Optical 405nm Notch Filter Glass is a high-precision optical filter designed to block, or "notch out," a very narrow band of light centered at 405nm while transmitting wavelengths on either side of this band. The "FWHM20nm" specification defines the width of this blocked band. This filter is "custom," meaning its parameters can be tailored for integration into specific optical systems. Specification: Key Specifications Decoded:   1. Notch Filter Function:    · Unlike bandpass filters (which transmit a narrow band), a notch filter does the opposite. It is a band-stop filter that rejects a specific, narrow range of wavelengths and transmits both shorter and longer wavelengths. Think of it as a highly selective spectral dam. 2. Center Wavelength (CWL) @ 405nm:    · The filter is engineered to target the 405nm wavelength, which is a deep violet laser line commonly emitted by gallium nitride (GaN) laser diodes. This specific wavelengt…