gtrace.optics.cavity¶
cavity.py - A Cavity class and related functions for representing a Fabry-Perot cavity
Module Contents¶
Attributes¶
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gtrace.optics.cavity.pi¶
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gtrace.optics.cavity.c= 299792458.0¶
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gtrace.optics.cavity.sqrt¶
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class
gtrace.optics.cavity.Cavity(r1=0.9, r2=0.99, L=1.0, R1=- 1.5, R2=1.5, wl=1.064e-06, power=False)¶ Bases:
traits.api.HasTraitsA class to represent a Fabry-Perot cavity.
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r1¶ Input mirror reflectivity (amplitude)
- Type
float
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r2¶ End mirror reflectivity (amplitude)
- Type
float
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rp1¶ Input mirror reflectivity (power)
- Type
float
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rp2¶ End mirror reflectivity (power)
- Type
float
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L¶ Length
- Type
float
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R1¶ ROC of the input mirror (positive when concave to incident light, i.e. convex seen from inside the cavity)
- Type
float
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R2¶ ROC of the end mirror (positive when concave to incident light, i.e. concave seen from inside the cavity)
- Type
float
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wl¶ Wavelength
- Type
float
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r1¶
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r2¶
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rp1¶
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rp2¶
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tp1¶
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tp2¶
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t1¶
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t2¶
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L¶
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R1¶
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R2¶
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g1¶
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g2¶
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wl¶
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_R1_changed(self, old, new)¶
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_R2_changed(self, old, new)¶
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_L_changed(self, old, new)¶
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_r1_changed(self, old, r1)¶
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_r2_changed(self, old, r2)¶
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finesse(self)¶ Returns the finesse of the cavity.
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storageTime(self)¶ Storage time
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pole(self)¶ Cavity pole frequency [Hz]
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Nbounce(self)¶ Bounce number
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powerGain(self)¶ Ratio of the intra-cavity power to the input power.
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FSR(self)¶ Returns the free spectral range of the cavity.
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modeSpacing(self)¶ Return the transverse mode spacing of the cavity (commonly called gamma). It is a fractional number defined by gamma = (mode spacing frequency)/FSR.
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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) – 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.
- Return type
(complex, float)
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spotSize(self)¶ Returns the beam spot sizes on the input and end mirrors as a tuple (w1,w2).
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trans(self, f=0, d=0)¶ Returns the amplitude transmissivity of the cavity. It assumes the cavity was locked to the incident light first. Then computes the amplitude transmissivity for the light with a frequency shift f from the original light with the cavity length changed by d from the initial state.
- Parameters
f (float, optional) – Frequency shift of the light in Hz. Defaults 0.
d (float, optional.) – Cavity length detuning in m. Defaults 0.
- Returns
The amplitude transmissivity of the cavity (a complex number).
- Return type
complex
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refl(self, f=0, d=0)¶ Returns the amplitude reflectivity of the cavity. It assumes the cavity was locked to the incident light first. Then computes the amplitude reflectivity for the light with a frequency shift f from the original light with the cavity length changed by d from the initial state.
- Parameters
f (float, optional) – Frequency shift of the light in Hz. Defaults 0.
d (float, optional.) – Cavity length detuning in m. Defaults 0.
- Returns
The amplitude reflectivity of the cavity (a complex number).
- Return type
complex
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intra(self, f=0, d=0)¶ Returns the intra cavity field amplitude. It assumes the cavity was locked to the incident light first. Then computes the intra-cavity field amplitude for the light with a frequency shift f from the original light with the cavity length changed by d from the initial state.
- Parameters
f (float, optional) – Frequency shift of the light in Hz. Defaults 0.
d (float, optional.) – Cavity length detuning in m. Defaults 0.
- Returns
The intra-cavity field amplitude at the input mirror surface (a complex number).
- Return type
complex
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gtrace.optics.cavity.finesse(r1, r2, power=False)¶ Returns the finesse of a cavity
- Parameters
r1 (float) – Reflectivity of the first mirror.
r2 (float) – Reflectivity of the second mirror.
power (boolean, optional) – If True, r1 and r2 are treated as power reflectivities. Otherwise, r1 and r2 are regarded as amplitude reflectivities. Defaults False.