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function ret=isCavityStable (abcd_cavity)
% finds if a cavity is stable baced on its abcd matrix
% see eq.4 for stability condition
% doi:10.1088/1464-4258/7/1/002
% http://dx.doi.org/10.1088/1464-4258/7/1/002
A=abcd_cavity(1,1);
B=abcd_cavity(1,2);
C=abcd_cavity(2,1);
D=abcd_cavity(2,2);
u= (A+D+2)/4;
if ( (0 < u) && (u < 1) )
ret = true;
else
ret = false;
end
end
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