![]() ![]() Nevertheless, the directionality of the reflection can create a substantially increased brightness of an illuminated object.ĭepending on the type of retroreflector, there can be substantial changes of polarization direction, and image rotation can occur. The reflectance of a retroreflector is usually substantially lower than that of a highly reflecting laser mirror. The nonlinear reflection works only for sufficiently high input intensity of the incident beam and with a limited reflectance. Here, the reflection or occurs at a Bragg grating in a nonlinear material, which is related to the incoming and reflected optical wave and automatically has the correct orientation for precise retroreflection.īesides, there is also the phenomenon of phase conjugation and a down-shift of the optical frequency of the reflected beam. There are nonlinear retroreflectors based on stimulated Brillouin scattering.That kind of retroreflector effect is known from the eyes of cats, where the eye's lens does part of the focusing and some reflection occurs on the retina, forming a quite imperfect retroreflector. It can also be realized in the form of a glass sphere with an appropriate refractive index. A cat's eye reflector contains a focusing lens in conjunction with a curved mirror. ![]() in the form of corner cube prisms, where reflections occur on three mutually orthogonal mirror surfaces. This is profoundly different from reflections at ordinary mirrors, where a light beam is reflected back in itself only for normal incidence on the mirror surface any tilt of the mirror will modify the direction of the reflected beam.įor some retroreflectors, there is a parallel offset of the reflected beam, but the direction is always quite precisely opposite to that of the incoming beam, limited only by the accuracy of the device.ĭifferent kinds of retroreflectors are available: Retroreflectors are a kind of reflectors (optical devices which reflect light), where the reflected light propagates in a direction which is parallel to the incident beam – and this for some range of beam directions. How to cite the article suggest additional literature ![]() Using our ad package, you can display your logo and further below your product description.ĭefinition: optical devices which reflect light in a direction which is parallel to the incident beam ![]()
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