def spotSize(self):
"""
Returns the beam spot sizes on the input and end mirrors
as a tuple (w1,w2).
"""
(q0, d) = self.waist()
w1 = gauss.q2w(q0 - d, wl=self.wl)
w2 = gauss.q2w(q0 + self.L - d, wl=self.wl)
return (w1, w2)
def waist(self, size=False):
"""
Return the q-parameter or the radius of the beam at the cavity waist.
Parameters
----------
size : boolean, optional
if set to true, the first element of the returned tuple will be the waist size, rather than the q-parameter.
Returns
-------
(q0, d) : (complex, float)
This function returns a tuple with two elements.
The first element is the q-parameter of the cavity mode at
the cavity waist. If size=True is given, it becomes the waist
size (1/e^2 radius).
The second element is the distance of the cavity waist from
the input mirror.
"""
# q0 = 1j*np.sqrt(self.L)*np.sqrt(-(self.L+self.R1)*(self.L-self.R2)\
# *(self.L+self.R1-self.R2))\
# /(2*self.L+self.R1-self.R2)
q0 = 1j*sqrt(-self.L*(self.L+self.R1)**2*(self.L-self.R2)*\
(self.L+self.R1-self.R2)/((-2*self.L-self.R1+self.R2)**2))\
/sqrt(self.L+self.R1)
d = self.L * (self.L - self.R2) / (2 * self.L + self.R1 - self.R2)
if size:
return (gauss.q2w(q0, wl=self.wl), d)
else:
return (q0, d)
def _qy_changed(self, old, new):
self.wy = q2w(self.qy, wl=self.wl / self.n)
self.set(trait_change_notify=False, qry=self.qy / self.n)
self.q = optimalMatching(self.qx, self.qy)[0]
def _qx_changed(self, old, new):
self.wx = q2w(self.qx, wl=self.wl / self.n)
self.set(trait_change_notify=False, qrx=self.qx / self.n)
self.q = optimalMatching(self.qx, self.qy)[0]