The rhomb-type achromatic prism retarder utilizes the phase difference introduced at the glass–air interface, where the beam of light undergoes total internal reflection. With the proper choice of glass materials and the number of total internal reflection, it is possible to obtain a desired phase difference. The phase difference introduced is also dependent on the angle of incidence of the light beam at the glass–air interface. A small change in angle of incidence causes a considerable change in phase difference. The change in the phase difference introduced with the change in external angle of incidence of the light beam in an achromatic prism-type quarter-wave retarder is studied both theoretically and experimentally. The experimental results obtained are found to be in accordance with the theoretical results.
When a polarized polychromatic beam passes through birefringent medium, the constituent spectral components suffer different change of state of polarization. As a result when the beam passes through an analyzer, the color of the resultant beam changes depending on the orientation of the analyzer, state of polarization of the input beam, spectral intensity distribution of the source and the polarizing properties of the birefringent medium. In the present article the variation of trichromatic color coordinates of the resulting beam is observed both theoretically and experimentally with the variation of the azimuthal angle of the analyzer. A comparative study is carried out between a quarter-wave plate and an achromatic quarter-wave prism. This study is envisaged to be useful for the performance analysis of achromatic wave plates.
Paraxial imaging equations are derived to determine the image position and magnification of light emitting semiconductor chip of a clear Tl3/4 LED lamp and a positive lens coupling optics. The energy density distribution in the image space of the coupling lens is studied with the help of non-sequential ray trace methodology by generating a computer aided 3D model. Finally the energy density distribution in the image space of the coupling lens is observed experimentally and the results are discussed.
Light coupling from a light emitting diode to an optical system is discussed on the basis of the Hasegawa model. Experimental observations are presented to show the variations in power coupling at different planes in the image space and the limitations of the model.
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