By Chow W.W., Koch S.W

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When P falls outside the geometric capture area of a photoreceptor (Fig. 2), a negligible amount of light is exposed to the photopigment. This fact is appreciated from the principles of reflection at a dielectric interface illustrated in Fig. 3. However, when p falls within the geometric capture area (Fig. 4), a fraction of light is contained within the photoreceptor throughout its entire length. This fraction depends on the number of rays emitted from P that undergo total internal reflection (Fig.

10. This is true only for the HElm family of modes (~11 and ~ 2 in Fig. 83~ modal patterns of Fig. 10 respectively). All other modes propagate below "cutoff" with their characteristic patterns. In particular, the modes indicated by the broken curves of Fig. 9, the four and six lobe patterns in Fig. 10, should be easily observed below their cutoff V's. e. they lose energy in the form of radiation as they travel down the photoreceptor. As V is reduced below cutoff the leakage rapidly increases (SAMMUT and SNYDER, 1975), so that the leaky modes are 46 visible only for V near cutoff.

The greater p the narrower the half-angle. 3 Receptor Orientation LATIES' work on photoreceptor orientation has had tremendous influence upon my views of retinal receptor optics. Through his findings, a path opened allowing initial consideration of the raison d'etre of retinal receptor waveguide properties of myriad species. Although thousands upon thousands of eyes previously had been sectioned in eye laboratories allover the world, LATIES (1969) first noted the fact that all the receptors seemed to point towards a common point near the front of the eye.

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Semiconductor-Laser Fundamentals by Chow W.W., Koch S.W

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