mode-matching.py 156 Bytes
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from numpy import pi

L = 140.#mm
R = 900.#mm
lambd = 1542.#nm

g = 1-L/R
print('g = %f'%g)

w0 = ((L*lambd/pi)*(g/(1-g))**0.5)**0.5
print('w0 = %f um'%w0)