Irms       1[W]                   Root mean square power of the source
T0         293.15                 Room temperature
lam        1064[nm]               Fiber laser's wavelength
d          50[mm]                 Diameter of the plano-convex lens
R          68.8[mm]               Radius of curvature of plano-convex lens
Te         3.0[mm]                Edge thickness of the plano-convex lens
Tc         Te+R-sqrt(R^2-(d/2)^2) Center thickness of the plano-convex lens
dis        1.5*R                  Distance between the collimating and focusing lens
bfl        145.0[mm]              Back focal length of the plano-convex lens
fiber_pos -(dis/2+Tc+bfl)         Position of the optical fiber
fiber_NA   0.1                    Numerical aperture of the optical fiber
theta      asin(fiber_NA)         Half cone angle of the released rays
n0         1.45                   Real part of the refractive index at T=T0 and lambda=lam
dndT       10e-6[1/K]             Thermal variation of the real part of the refractive index