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physics.optics2002★ 34 cited
An alternate way to obtain the aberration expansion in Helmholtz Optics
Sameen Ahmed Khan
Exploiting the similarities between the Helmholtz wave equation and the Klein-Gordon equation, the former is linearized using the Feschbach-Villars procedure used for linearizing t…
physics.optics2002★ 62 cited
Maxwell Optics: I. An exact matrix representation of the Maxwell equations in a medium
Sameen Ahmed Khan
Matrix representations of the Maxwell equations are well-known. However, all these representations lack an exactness or/and are given in terms of a {\em pair} of matrix equations.…