Optics
Optics
Antireflection films
Forming a single-layer or multi-layer dielectric thin film on an optical material surface enables the prevention of the reflection of light on the surface and enhances the transmittance. In addition, on optical elements, these films enable the prevention of the occurrence of ghosts.
Dichroic mirrors/filters
Forming a dielectric multi-layer film with different refractive indexes enables the separation of light in an arbitrary specific wavelength region into transmitted light and reflected light by using light interference.
Bandpass filters
They can transmit and reflect light with selected wavelengths.
Multiple bandpass filters
They are bandpass filters with multiple transmission bands. As their transmission region ranges from ultraviolet light to near-infrared light, they can handle a wide variety of light types. These filters are applicable to Raman spectroscopy, fluorescence microscopes, PCR analyzers, and so on.
Metallic thin film mirrors / High reflection mirrors
Metallic thin film mirrors are characterized by their small angle dependence, which varies the reflection rate depending on the angle of incidence. High reflection mirrors are more dependent on angles than metallic mirrors but enable increasing the reflection rate in specific bandwidths.
Beam splitters
They split a light flux into several fluxes to reflect or transmit an incident light. The beam splitters that reflect and transmit light at a ratio of approximately 1:1 are called half mirror type beam splitters. There are also beam splitters that can separate polarization components. Beam splitters are used in optical pickups, reflection-type liquid-crystal projectors, optical communication devices, photonic random number generators, and so on.
Cold mirrors/filters (IR cutoff filters)
They transmit over 85% of visible light and reflect over 85% of light beams with a wavelength of approximately 1 μm. They produce a high thermal insulation effect in halogen and xenon lamps that have high radiation energy at a wavelength of approximately 1 μm. A typical application example is UV/IR cutoff filters.
ND filters
These filters are mounted on camera lenses and so on and can reduce light almost constantly in specific wavelength regions. They are able to reduce only light quantity, without affecting colors.
Optical thin films for lasers
Laser devices employ a lot of optical components that have a dielectric multi-layer film on their surfaces. Such optical thin films are required to be highly stable and long-lived, as well as durable against laser lights with high energy density.
