功能

• This is a long-pass filter that cuts shorter wavelengths and transmits longer wavelengths.
• It is used to cut off the wavelength range (For example, the ultraviolet region) that interferes with the observation.
• Wavelengths in the cut area are completely absorbed by the filter, so there is no leakage of transmitted light.
• The transmission limit wavelength can be selected in increments of 10 nm to 20 nm.
• In the transmission wavelength region, there is no small absorption or ripple, and the transmittance characteristic is obtained without absorption up to 2000 nm.
• A dichroic filter (SDM) with a narrower wavelength gradient is also available.
• * 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.
• * The maximum transmittance is about 90% due to the reflected light from the front and back.