기능

• A filter with a spectral width at half maximum (1 nm to 40 nm) that transmits only specified wavelengths.
• It is used to extract only a specific spectrum from an emission line lamp or to extract only a specific wavelength from a multi-wavelength oscillating laser.
• The multilayer coating of the dielectric film and metal film provides a sharp rise and a reliable shielding of the cutoff wavelength region.
• Since the interference filter is fixed to the metal frame, it is easy to fix to the holder and handle the element.
• Filters can be selected from a number of wavelengths ranging from 214 nm ultraviolet to 1550 nm infrared.
• □ Large size 50 interference filter (VPF-50 S) and high transmission interference filter (YIF) are available.
• * The characteristics of the interference filter depend on the incident angle. When the angle is tilted to the optical axis, the center wavelength moves to the short wavelength side, and the transmittance also decreases.
• * Enter a parallel beam or a light close to the parallel beam at 0° to the optical axis.
• * The narrower the half-width, the greater the angular dependency.
• * The tolerance of the center wavelength is set to the long wavelength side because the angular dependence of the interference filter is taken into consideration.
• * The specifications of each filter are based on the temperature of 23°C.
• * As the temperature rises, the wavelength shifts to the longer wavelength.
• * Each filter has been precisely adjusted to achieve high performance.
• * For this reason, the filter thickness varies one by one.
• * Interference filters absorb light and cannot be used with high-power lasers or high-energy pulsed lasers.