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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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Optical Prism
Fresnel prism is a special behavior extender, which acts like a wide-band wave plate and can provide the required phase delay over a wide wavelength range, and the wavelength range is wider than that of a birefringent wave plate. It can be used as an alternative to the delayed wave plates used in broadband, multi-wavelength or tunable laser sources, and is often used in spectral instruments such as ellipsometers. The prism design produces a 45° phase difference per internal reflection, providing a λ/4 phase delay. Because the phase difference is caused by the slowly changing rhomboid prism dispersion, the delay change due to different wavelengths is much smaller than that of other types of retarders. The half-wave retarder is composed of two quarter-wave retarders
Dove prism is a kind of rotation. When light passes through this prism, the image is reversed 180°. In addition, when the prism is rotated on its optical axis, the rotation Angle of the image is twice the rotation Angle of the prism. The Dove prism uses the critical Angle principle to achieve internal total reflection, so its field of view Angle is limited. At the same time, it is important to keep the reflector clean and use parallel light.
Right Angle prisms are usually used to turn the light path or to deflect the image of an optical system by 90°. Depending on the orientation of the prism, the image can be left and right, and upside down and left and right. Right Angle prisms can also be used for image combination, beam deflection and other applications. Conventional materials can choose N-BK7, UV fused quartz, CaF2, SF material, etc. And can be customer requirements plated anti-reflection film or reflective film. Material selection: BK7 material, suitable for visible to near infrared band, low price, stable performance. Fused quartz material, suitable for deep ultraviolet to near infrared band, low coefficient of thermal expansion, can be used in ultraviolet or high power applications. CaF2 material, suitable for outside to mid-infrared band, can have a good transmittance in the range of 0.13um~10um.
When light enters a surface of a Rhombic prism from a medium, it is reflected according to the magnitude of the incidence Angle. Depending on the geometry of the Rhombic prism, light can be reflected several times inside the lens. By controlling the incidence Angle of the rhelical prism and the refractive index of the lens, the deflection, separation and merging of the light can be realized.
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