By Michelson A.A.
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Extra info for A Modification of the Revolving Mirror Method for Measuring the Velocity of Light (1920)(en)(2s)
58 Passive Components for Dense Optical Integration Four-port system with single mode resonator T • ... 2 N 0.. 2 : Four-port systems using (a) a traveling wave, (b) a standing wave resonator, and (c) an example of the corresponding filter response with Qe =Q' e =2000 and negligible loss.
86) with oscillation periods hx ,/2. In a uniform medium hx = hy = 00 and from Eq. 88) Z where zo(x. y) = kW~(x. y/2 and W 0 is the minimum waist. These relations show that as a Gaussian beam propagates in free space it spreads out curving its phase fronts . In a dielectric structure with cylindrical symmetry h x = hy the Gaussian beam has cylindrical symmetry as well and is described by one q-parameter qx = qy = q and s, = R y = R ,wx = wy = w . 3 results in the correct answer for the effective index and the beam width only for the eigenmode of a quadratic medium.
3 Boundary Conditions The main limitation of FDTD and other numerical methods based on finite-differencing, is the modelling of unbounded geometries by a finite computational domain. Thus the finite-difference equations must be modified at the boundaries of the truncated grid to approximate fields that are leaving the computational domain without back reflections. Many techniques have been proposed to implement an Absorbing Boundary Condition (ABC) ,,. These ABC's permits outgoing waves to leave the computat ional domain using a one-way wave equation.