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Yttrium alumate (YVO4) is an excellent birefringent crystal material, which is a negative uniaxial crystal. The crystal has good physical and mechanical properties, wide light transmission range, high transmittance, large birefringence coefficient and easy processing. YVO4 crystal can replace ice SPAR and crystal red stone in the field of optical fiber communication, is the key material in optical communication passive devices such as optical isolators, circulators, polarization splitters, polarizers.
Caicite Crystal is a kind of natural birefringent material, in the shape of diamond, birefringence coefficient is large, through the spectrum is wide, from visible to near infrared has relatively good optical properties. Although the mechanical strength of Iceland SPAR material is soft and easy to scratch, it still does not affect its wide application in polarization devices. Caicite is mainly used in Glan POLARIZER.
LiNbO3 is widely used in optical fiber communication as a birefringent crystal. The crystal has good physical and mechanical properties, wide light transmission range, high transmittance, easy processing, and lower material cost than other materials. Lithium niobate crystals are widely used in passive optical communication devices such as optical isolators, circulators, polarization splitters, polarizers, etc
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Filter
Filters are used for selecting or filtrating the specific wave band,they are widely used in optical instrument,industrial measurement, environment protection and many other applications.We can provides short passfilter,long pass filter,band pass filter ,color glass filter,etc. The dimension and coating index can be customized according to customer requirements.
An optical film that uses the interference principle to allow only light in a specific spectral range to pass through. It usually consists of multiple layers of thin film. Common interference filters are divided into two categories: cut-off filter and bandpass filter. The cut-off filter can divide the spectral range into two regions, the light in one region cannot pass through (the cut-off region), and the light in the other region can pass through fully (the passband region). Typical cut-off filters have short-pass filters (allowing only short-wave light to pass through) and long-pass filters (allowing only long-wave light to pass through), which are multi-layer dielectric films with a periodic structure composed of alternating high-refractive index layers and low-refractive index layers.
Neutral density filter is a filter that only attenuates the light intensity without changing the spectral energy distribution, also known as the attenuator. It can attenuate the light intensity, and after the light in the range of visible light to near-infrared light passes through the neutral density filter, different wavelengths are attenuated in the same proportion, so that the optical element maintains approximately equal light energy transmittance in the wide band. The neutral density filter is divided into absorption type and reflection type according to the different working principle, at the same time, according to the different working area, it is divided into invariant type and variable type, and variable type is divided into continuous type and step type.
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