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** This device models a laser beam divergence in a simple way
* Assumption : the emmitted beam is spherical
*Input is an optical power in Watts/V.
*Output is an irradiance in (W*m²)/V.
.SUBCKT optical_div W WM2 PARAMS: D=10 THETA_DEG=2
EGAIN WM2 0 W 0 {1/(pi*D*D*tan(THETA_DEG*pi/180))}
.ENDS