기능

• Light sources such as halogen lamps and xenon lamps contain strong thermal (infrared) radiation in addition to visible light.
• Use to extract visible light from these lamps that is not affected by heat radiation.
• By blocking light in the wide wavelength range from the near infrared to the far infrared, the temperature rise caused by radiant heat can be suppressed.
• In an optical system such as a microscope, when the light of a lamp is collected at a single point, the temperature of the sample is prevented from being abnormally high by blocking the heat rays.
• Because of the high transmittance in the visible range, the lamp does not feel dark when the filter is transmitted.
• If the filter is placed close to a light source, the filter may break due to sudden temperature changes.
• If the filter is subjected to heat strengthening treatment, the filter will not break easily even if the temperature rises.
• * Cannot be used for high-power laser or high-energy pulse laser in the absorption wavelength range.
• * Anti-reflection coat is not applied on both sides.
• * Reflected light from the front and back causes a transmittance loss of about 10%.
• * To ensure sufficient absorption of infrared rays, there is absorption at the long wavelength side of the visible range.
• * This causes the filter's transmission color to appear cyan (light cyan).