Features

• An ND filter used to dim high-power lasers and light in a wide wavelength range.
• Light that does not transmit is not absorbed by the glass, so there is no need to worry about the glass getting hot and breaking.
• Because it is reflected by a metal film, it shows very smooth transmittance wavelength characteristics from ultraviolet to infrared.
• The thickness of the glass is 2 mm +/- 0.1 mm and is constant regardless of the transmittance.
• * Since chromium film has absorption, it can not be used for high-energy pulsed lasers.
• * When a high-power laser is injected into the filter, the beam may focus due to the thermal lens effect.
• * For high-power and high-energy lasers, use a variable beam splitter (VBS).
• * The laser beam reflected by the surface of the filter is dangerous.
• * Terminate the reflected beam so as not to irradiate the worker.
• * When the laser beam enters the filter normally, the light reflected by the filter returns to the laser source.
• * The laser oscillation becomes unstable when such returning light is present.
• * Tilt the filter slightly to prevent the return light from returning to the laser source.
• * The 92% transmittance filter (FND-92, MFND-92) is a double-sided, no-coat, flat board.
• * A loss of 4% reflectance (8% on both sides) on a no-coat surface results in a transmittance of about 92%.