Right, I wasn't clear. If we defined the case when the H-field does change direction upon reflection (n1>n2) then the situation looks like this.
http://dl.dropbox.com/u/1505234/Fresnel%20Eqs%20-%20p-polariozation.bmp
and the boundary condition for the magnetic field would be Bi-Br=Bt. I...
Ok I see, thanks RedBelly. So to be consistent between the two polarizations, I should define the p-polarization as positive when the magnetic field receives a pi phase shift (and therefore the E-field does not).
Sorry if this reply is too obvious, but, why would the gain stop when it becomes equal to the total loss of the cavity? The gain should exceed the loss or there would be no laser light output. What stops then gain must be a finite amount of electrons and states for stimulated emission events...
Hello everybody, I have a question about the Fresnel equations at normal incidence. My textbook gives the reflection coefficients as:
(1) perpendicular polarization
rs=( n1*cos(theta1)-n2*cos(theta2) ) / ( n1*cos(theta1)+n2*cos(theta2) )
(2) parallel polarization
rp=(...