ThresholdSearchCyl Class¶

class meta.shockley.ThresholdSearchCyl(name='')

Solver for threshold search of semiconductor laser.

This solver performs thermo-electrical computations followed by determination ot threshold current and optical analysis in order to determine the threshold of a semiconductor laser. The search is performed by scipy root finding algorithm in order to determine the voltage and electric current ensuring no optical loss in the laser cavity.

The computations can be executed using compute method, after which the results may be save to the HDF5 file with save or presented visually using plot_... methods. If save parameter of the compute() method is True the fields are saved automatically after the computations. The file name is based on the name of the executed script with suffix denoting either the launch time or the identifier of a batch job if a batch system (like SLURM, OpenPBS, or SGE) is used.

Methods¶

 compute([save, invalidate, group, stepsave]) Execute the algorithm. compute_thermoelectric() Perform thermo-electric calculations. get_gain_spectrum(lams[, pos, junction]) Get gain spectrum for specified junction. get_junction_concentrations([interpolation]) Get carriers concentration at the active regions. get_junction_currents([refine, interpolation]) Get current densities at the active regions. get_junction_gains([axis, interpolation]) Get gain at the active regions. get_lam() Get approximate wavelength for optical computations. get_optical_determinant(lam) Function computing determinant of the optical solver. get_optical_field([resolution]) Get computed optical mode field at threshold. get_optical_field_horizontal([resolution, …]) Get horizontal distribution of the computed optical mode field at threshold. get_optical_field_vertical([pos, offset, …]) Plot vertical distribution of the computed optical mode field at threshold and refractive index profile. get_temperature() Get temperature on a thermal mesh. get_total_current([nact]) Get total current flowing through active region [mA] get_vert_optical_determinant(vlam) Function computing ‘vertical determinant’ of the optical solver. get_vertical_voltage([at]) Get computed voltage along the vertical axis. get_voltage() Get voltage on an electrical mesh. initialize() Initialize solver. invalidate() Set the solver back to uninitialized state. plot_gain_spectrum(lams[, pos, junction, comp]) Plot gain spectrum for specified junction. plot_junction_concentration([bounds, …]) Plot carriers concentration at the active region. plot_junction_current([refine, bounds, …]) Plot current density at the active region. plot_junction_gain([axis, bounds, …]) Plot gain at the active region. plot_optical_determinant(lams, **kwargs) Function plotting determinant of the optical solver. plot_optical_field([resolution, …]) Plot computed optical mode field at threshold. plot_optical_field_horizontal([resolution, …]) Plot horizontal distribution of the computed optical mode field at threshold. plot_optical_field_vertical([pos, offset, …]) Plot vertical distribution of the computed optical mode field at threshold and refractive index profile. plot_temperature([geometry_color, …]) Plot computed temperature to the current axes. plot_vert_optical_determinant(vlams, **kwargs) Function plotting ‘vertical determinant’ of the optical solver. plot_vertical_voltage([at]) Plot computed voltage along the vertical axis. plot_voltage([geometry_color, mesh_color, …]) Plot computed voltage to the current axes. reconnect() Reconnect all internal solvers. save([filename, group, optical_resolution]) Save the computation results to the HDF5 file. step(volt[, save]) Function performing one step of the threshold search.

Attributes¶

Providers¶

 outCarriersConcentration Provider of the computed carriers concentration [1/cm³]. outConductivity Provider of the computed electrical conductivity [S/m]. outCurrentDensity Provider of the computed current density [kA/cm²]. outGain Provider of the computed material gain [1/cm]. outHeat Provider of the computed heat sources density [W/m³]. outHeatFlux Provider of the computed heat flux [W/m²]. outLightE Provider of the computed electric field [V/m]. outLightMagnitude Provider of the computed optical field magnitude [W/m²]. outLoss Provider of the computed modal extinction [1/cm]. outRefractiveIndex Provider of the computed refractive index [-]. outTemperature Provider of the computed temperature [K]. outThermalConductivity Provider of the computed thermal conductivity [W/(m×K)]. outVoltage Provider of the computed voltage [V]. outWavelength Provider of the computed wavelength [nm].

Other¶

 diffusion electrical.diffusion.DiffusionCyl solver used for electrical calculations. dlam Wavelength step. electrical electrical.shockley.ShockleyCyl solver used for electrical calculations. gain gain.freecarrier.FreeCarrierCyl solver used for gain calculations. id Id of the solver object. initialized True if the solver has been initialized. lpm Angular mode number $m$. lpn Radial mode number $n$. maxiter Maximum number of root finding iterations. maxlam Maximum wavelength considered for the optical mode search. optical optical.effective.EffectiveFrequencyCyl solver used for optical calculations. optical_resolution Number of points along the horizontal and vertical axes for the saved and plotted optical field. quick skip_thermal Skip thermal computations. tfreq Number of electrical iterations per single thermal step. thermal thermal.static.StaticCyl solver used for thermal calculations. vmax Maximum voltage to search threshold for. vmin Minimum voltage to search threshold for. vtol Tolerance on voltage in the root search.

Descriptions¶

Method Details¶

ThresholdSearchCyl.compute(save=True, invalidate=False, group='ThresholdSearch', stepsave=False)

Execute the algorithm.

In the beginning the solvers are invalidated and next, the self- consistent loop of thermal, electrical, gain, and optical calculations are run within the root-finding algorithm until the mode is found with zero optical losses.

Parameters: save (bool or str) – If True the computed fields are saved to the HDF5 file named after the script name with the suffix denoting either the batch job id or the current time if no batch system is used. The filename can be overridden by setting this parameter as a string. invalidate (bool) – If this flag is set, solvers are invalidated in the beginning of the computations. group (str) – HDF5 group to save the data under. stepsave (bool) – If True the computed fields are saved to the HDF5 file after each computations step. The voltage set to ivolt boundary condition for the threshold. The threshold current can be then obtained by calling: >>> solver.get_total_current() 123.0 
ThresholdSearchCyl.compute_thermoelectric()

Perform thermo-electric calculations.

This method may be called manually to perform thermo-electric calculations. Afterwards, one may investigate gain spectrum or verify settings of the optical solver.

ThresholdSearchCyl.get_gain_spectrum(lams, pos=0.0, junction=0)

Get gain spectrum for specified junction.

Parameters: lams (array of floats) – Wavelengths for which the spectrum should be plotted. pos (float) – Lateral position fo the point in which the spectrum is plotted. junction (int) – Junction number to take gain from. Gain spectrum. Data
ThresholdSearchCyl.get_junction_concentrations(interpolation='linear')

Get carriers concentration at the active regions.

Parameters: interpolation (str) – Interpolation used when retrieving current density. Dictionary of junction current density data. Keys are the junction number. dict
ThresholdSearchCyl.get_junction_currents(refine=16, interpolation='linear')

Get current densities at the active regions.

Parameters: refine (int) – Number of points in the plot between each two points in the computational mesh. interpolation (str) – Interpolation used when retrieving current density. Dictionary of junction current density data. Keys are the junction number. dict
ThresholdSearchCyl.get_junction_gains(axis=None, interpolation='linear')

Get gain at the active regions.

Parameters: axis – Points along horizontal axis to plot gain at. Defaults to the optical mesh. Dictionary of junction current density data. Keys are the junction number. dict
ThresholdSearchCyl.get_lam()

Get approximate wavelength for optical computations.

This method returns approximate wavelength for optical computations. By default if browses the wavelength range starting from maxlam, decreasing it by dlam until radial mode lpn is found.

You can override this method or set it to a a fixed value to use custom mode approximation.

Example

>>> solver = ThresholdSearchCyl()
>>> solver.get_lam = 980.
>>> solver.compute()

ThresholdSearchCyl.get_optical_determinant(lam)

Function computing determinant of the optical solver.

Parameters: lam (float or array) – Wavelength to compute the determinant for [nm]. Optical determinant. float or array
ThresholdSearchCyl.get_optical_field(resolution=None)

Get computed optical mode field at threshold.

Parameters: resolution (tuple of ints) – Number of points in horizontal and vertical directions.
ThresholdSearchCyl.get_optical_field_horizontal(resolution=None, interpolation='linear')

Get horizontal distribution of the computed optical mode field at threshold.

Parameters: resolution (int) – Number of points in horizontal direction. interpolation (str) – Interpolation used when retrieving current density.
ThresholdSearchCyl.get_optical_field_vertical(pos=0.01, offset=0.5, resolution=None, interpolation='linear')

Plot vertical distribution of the computed optical mode field at threshold and refractive index profile.

Parameters: resolution (int) – Number of points in horizontal direction. pos (float) – Horizontal position to get the field at. offset (float) – Distance above and below geometry boundary to include into the plot. interpolation (str) – Interpolation used when retrieving current density.
ThresholdSearchCyl.get_temperature()

Get temperature on a thermal mesh.

ThresholdSearchCyl.get_total_current(nact=0)

Get total current flowing through active region [mA]

ThresholdSearchCyl.get_vert_optical_determinant(vlam)

Function computing ‘vertical determinant’ of the optical solver.

Parameters: vlam (float or array) – ‘Vertical wavelength’ to compute the vertical determinant for [nm]. Optical vertical determinant. float or array
ThresholdSearchCyl.get_vertical_voltage(at=0)

Get computed voltage along the vertical axis.

Parameters: at (float) – Horizontal position of the axis at which the voltage is plotted.
ThresholdSearchCyl.get_voltage()

Get voltage on an electrical mesh.

ThresholdSearchCyl.initialize()

Initialize solver.

This method manually initialized the solver and sets initialized to True. Normally calling it is not necessary, as each solver automatically initializes itself when needed.

Returns: solver initialized state prior to this method call. bool
ThresholdSearchCyl.invalidate()

Set the solver back to uninitialized state.

This method frees the memory allocated by the solver and sets initialized to False.

ThresholdSearchCyl.plot_gain_spectrum(lams, pos=0.0, junction=0, comp=None, **kwargs)

Plot gain spectrum for specified junction.

Parameters: lams (array of floats) – Wavelengths for which the spectrum should be plotted. pos (float) – Lateral position fo the point in which the spectrum is plotted. junction (int) – Junction number to take gain from. comp (int or str) – Spectrum component to plot **kwargs – Keyword arguments passed to the plot function.
ThresholdSearchCyl.plot_junction_concentration(bounds=True, interpolation='linear', label=None, **kwargs)

Plot carriers concentration at the active region.

Parameters: bounds (bool) – If True then the geometry objects boundaries are plotted. interpolation (str) – Interpolation used when retrieving current density. label (str or sequence) – Label for each junction. It can be a sequence of consecutive labels for each junction, or a string in which case the same label is used for each junction. If omitted automatic label is generated. **kwargs – Keyword arguments passed to the plot function.
ThresholdSearchCyl.plot_junction_current(refine=16, bounds=True, interpolation='linear', label=None, **kwargs)

Plot current density at the active region.

Parameters: refine (int) – Number of points in the plot between each two points in the computational mesh. bounds (bool) – If True then the geometry objects boundaries are plotted. interpolation (str) – Interpolation used when retrieving current density. label (str or sequence) – Label for each junction. It can be a sequence of consecutive labels for each junction, or a string in which case the same label is used for each junction. If omitted automatic label is generated. **kwargs – Keyword arguments passed to the plot function.
ThresholdSearchCyl.plot_junction_gain(axis=None, bounds=True, interpolation='linear', label=None, **kwargs)

Plot gain at the active region.

Parameters: axis (mesh or sequence) – Points along horizontal axis to plot gain at. Defaults to the optical mesh. bounds (bool) – If True then the geometry objects boundaries are plotted. interpolation (str) – Interpolation used when retrieving current density. label (str or sequence) – Label for each junction. It can be a sequence of consecutive labels for each junction, or a string in which case the same label is used for each junction. If omitted automatic label is generated. **kwargs – Keyword arguments passed to the plot function.
ThresholdSearchCyl.plot_optical_determinant(lams, **kwargs)

Function plotting determinant of the optical solver.

Parameters: lams (array) – Wavelengths to plot the determinant for [nm]. **kwargs – Keyword arguments passed to the plot function.
ThresholdSearchCyl.plot_optical_field(resolution=None, geometry_color='0.75', geometry_alpha=0.35, geometry_lw=1.0, **kwargs)

Plot computed optical mode field at threshold.

Parameters: resolution (tuple of ints) – Number of points in horizontal and vertical directions. geometry_color (str or None) – Matplotlib color specification for the geometry. If None, structure is not plotted. geometry_alpha (float) – Geometry opacity (1 — fully opaque, 0 – invisible). geometry_lw (float) – Line width for geometry. **kwargs – Keyword arguments passed to the plot function.
ThresholdSearchCyl.plot_optical_field_horizontal(resolution=None, bounds=True, interpolation='linear', **kwargs)

Plot horizontal distribution of the computed optical mode field at threshold.

Parameters: resolution (int) – Number of points in horizontal direction. bounds (bool) – If True then the geometry objects boundaries are plotted. interpolation (str) – Interpolation used when retrieving current density. **kwargs – Keyword arguments passed to the plot function.
ThresholdSearchCyl.plot_optical_field_vertical(pos=0.01, offset=0.5, resolution=None, interpolation='linear', **kwargs)

Plot vertical distribution of the computed optical mode field at threshold and refractive index profile.

Parameters: resolution (int) – Number of points in horizontal direction. pos (float) – Horizontal position to get the field at. offset (float) – Distance above and below geometry boundary to include into the plot. interpolation (str) – Interpolation used when retrieving current density. **kwargs – Keyword arguments passed to the plot function.
ThresholdSearchCyl.plot_temperature(geometry_color='0.75', mesh_color=None, geometry_alpha=0.35, mesh_alpha=0.15, geometry_lw=1.0, mesh_lw=1.0, **kwargs)

Plot computed temperature to the current axes.

Parameters: geometry_color (str or None) – Matplotlib color specification for the geometry. If None, structure is not plotted. mesh_color (str or None) – Matplotlib color specification for the mesh. If None, the mesh is not plotted. geometry_alpha (float) – Geometry opacity (1 — fully opaque, 0 – invisible). mesh_alpha (float) – Mesh opacity (1 — fully opaque, 0 – invisible). geometry_lw (float) – Line width for geometry. mesh_lw (float) – Line width for mesh. **kwargs – Keyword arguments passed to the plot function.

plask.plot_field() : Plot any field obtained from receivers

ThresholdSearchCyl.plot_vert_optical_determinant(vlams, **kwargs)

Function plotting ‘vertical determinant’ of the optical solver.

Parameters: vlams (array) – ‘Vertical wavelengths’ to plot the determinant for [nm]. **kwargs – Keyword arguments passed to the plot function.
ThresholdSearchCyl.plot_vertical_voltage(at=0.0, **kwargs)

Plot computed voltage along the vertical axis.

Parameters: at (float) – Horizontal position of the axis at which the voltage is plotted. **kwargs – Keyword arguments passed to the plot function.
ThresholdSearchCyl.plot_voltage(geometry_color='0.75', mesh_color=None, geometry_alpha=0.35, mesh_alpha=0.15, geometry_lw=1.0, mesh_lw=1.0, **kwargs)

Plot computed voltage to the current axes.

Parameters: geometry_color (str or None) – Matplotlib color specification for the geometry. If None, structure is not plotted. mesh_color (str or None) – Matplotlib color specification for the mesh. If None, the mesh is not plotted. geometry_alpha (float) – Geometry opacity (1 — fully opaque, 0 – invisible). mesh_alpha (float) – Mesh opacity (1 — fully opaque, 0 – invisible). geometry_lw (float) – Line width for geometry. mesh_lw (float) – Line width for mesh. **kwargs – Keyword arguments passed to the plask.plot_field().

plask.plot_field() : Plot any field obtained from receivers

ThresholdSearchCyl.reconnect()

Reconnect all internal solvers.

This method should be called if some of the internal solvers were changed manually.

ThresholdSearchCyl.save(filename=None, group='ThresholdSearch', optical_resolution=None)

Save the computation results to the HDF5 file.

Parameters: filename (str) – The file name to save to. If omitted, the file name is generated automatically based on the script name with suffix denoting either the batch job id or the current time if no batch system is used. group (str) – HDF5 group to save the data under. optical_resolution (tuple of ints) – Number of points in horizontal and vertical directions for optical field.
ThresholdSearchCyl.step(volt, save=False)

Function performing one step of the threshold search.

Parameters: volt (float) – Voltage on a specified boundary condition [V]. save (bool) – If True the computed fields are saved to the HDF5 file after each computations step. Loss of a specified mode float

Provider Details¶

ThresholdSearchCyl.outCarriersConcentration(n=0, mesh, interpolation='default')

Provider of the computed carriers concentration [1/cm³].

Parameters: type (str) – Detailed information which carriers are returned. It can be ‘majority’ to return majority carriers in given material, ‘pairs’ for the concentration of electron-hole pairs, ‘electrons’, or ‘holes’ for particular carriers type. mesh (mesh) – Target mesh to get the field at. interpolation (str) – Requested interpolation method. Data with the carriers concentration on the specified mesh [1/cm³].

You may obtain the number of different values this provider can return by testing its length.

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inCarriersConcentration = solver.outCarriersConcentration


Obtain the provided field:

>>> solver.outCarriersConcentration(0, mesh)


Test the number of provided values:

>>> len(solver.outCarriersConcentration)
3

ThresholdSearchCyl.outConductivity(mesh, interpolation='default')

Provider of the computed electrical conductivity [S/m].

Parameters: mesh (mesh) – Target mesh to get the field at. interpolation (str) – Requested interpolation method. Data with the electrical conductivity on the specified mesh [S/m].

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inConductivity = solver.outConductivity


Obtain the provided field:

>>> solver.outConductivity(mesh)

ThresholdSearchCyl.outCurrentDensity(mesh, interpolation='default')

Provider of the computed current density [kA/cm²].

Parameters: mesh (mesh) – Target mesh to get the field at. interpolation (str) – Requested interpolation method. Data with the current density on the specified mesh [kA/cm²].

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inCurrentDensity = solver.outCurrentDensity


Obtain the provided field:

>>> solver.outCurrentDensity(mesh)

ThresholdSearchCyl.outGain(n=0, mesh, wavelength, interpolation='default')

Provider of the computed material gain [1/cm].

Parameters: deriv (str) – Gain derivative to return. can be ‘’ (empty) or ‘conc’. In the latter case, the gain derivative over carriers concentration is returned. mesh (mesh) – Target mesh to get the field at. interpolation (str) – Requested interpolation method. wavelength (float) – The wavelength at which the gain is computed [nm]. Data with the material gain on the specified mesh [1/cm].

You may obtain the number of different values this provider can return by testing its length.

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inGain = solver.outGain


Obtain the provided field:

>>> solver.outGain(0, mesh, wavelength)


Test the number of provided values:

>>> len(solver.outGain)
3

ThresholdSearchCyl.outHeat(mesh, interpolation='default')

Provider of the computed heat sources density [W/m³].

Parameters: mesh (mesh) – Target mesh to get the field at. interpolation (str) – Requested interpolation method. Data with the heat sources density on the specified mesh [W/m³].

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inHeat = solver.outHeat


Obtain the provided field:

>>> solver.outHeat(mesh)

ThresholdSearchCyl.outHeatFlux(mesh, interpolation='default')

Provider of the computed heat flux [W/m²].

Parameters: mesh (mesh) – Target mesh to get the field at. interpolation (str) – Requested interpolation method. Data with the heat flux on the specified mesh [W/m²].

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inHeatFlux = solver.outHeatFlux


Obtain the provided field:

>>> solver.outHeatFlux(mesh)

ThresholdSearchCyl.outLightE(n=0, mesh, interpolation='default')

Provider of the computed electric field [V/m].

Parameters: n (int) – Value number. mesh (mesh) – Target mesh to get the field at. interpolation (str) – Requested interpolation method. Data with the electric field on the specified mesh [V/m].

You may obtain the number of different values this provider can return by testing its length.

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inLightE = solver.outLightE


Obtain the provided field:

>>> solver.outLightE(0, mesh)


Test the number of provided values:

>>> len(solver.outLightE)
3

ThresholdSearchCyl.outLightMagnitude(n=0, mesh, interpolation='default')

Provider of the computed optical field magnitude [W/m²].

Parameters: n (int) – Computed mode number. mesh (mesh) – Target mesh to get the field at. interpolation (str) – Requested interpolation method. Data with the optical field magnitude on the specified mesh [W/m²].

You may obtain the number of different values this provider can return by testing its length.

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inLightMagnitude = solver.outLightMagnitude


Obtain the provided field:

>>> solver.outLightMagnitude(0, mesh)


Test the number of provided values:

>>> len(solver.outLightMagnitude)
3

ThresholdSearchCyl.outLoss(n=0)

Provider of the computed modal extinction [1/cm].

Parameters: n (int) – Value number. Value of the modal extinction [1/cm].

You may obtain the number of different values this provider can return by testing its length.

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inModalLoss = solver.outLoss


Obtain the provided value:

>>> solver.outLoss(n=0)
1000


Test the number of provided values:

>>> len(solver.outLoss)
3


Provider class: plask.flow.ModalLossProvider

Receciver class: plask.flow.ModalLossReceiver

ThresholdSearchCyl.outRefractiveIndex(mesh, interpolation='default')

Provider of the computed refractive index [-].

Parameters: mesh (mesh) – Target mesh to get the field at. interpolation (str) – Requested interpolation method. Data with the refractive index on the specified mesh [-].

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inRefractiveIndex = solver.outRefractiveIndex


Obtain the provided field:

>>> solver.outRefractiveIndex(mesh)

ThresholdSearchCyl.outTemperature(mesh, interpolation='default')

Provider of the computed temperature [K].

Parameters: mesh (mesh) – Target mesh to get the field at. interpolation (str) – Requested interpolation method. Data with the temperature on the specified mesh [K].

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inTemperature = solver.outTemperature


Obtain the provided field:

>>> solver.outTemperature(mesh)

ThresholdSearchCyl.outThermalConductivity(mesh, interpolation='default')

Provider of the computed thermal conductivity [W/(m×K)].

Parameters: mesh (mesh) – Target mesh to get the field at. interpolation (str) – Requested interpolation method. Data with the thermal conductivity on the specified mesh [W/(m×K)].

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inThermalConductivity = solver.outThermalConductivity


Obtain the provided field:

>>> solver.outThermalConductivity(mesh)

ThresholdSearchCyl.outVoltage(mesh, interpolation='default')

Provider of the computed voltage [V].

Parameters: mesh (mesh) – Target mesh to get the field at. interpolation (str) – Requested interpolation method. Data with the voltage on the specified mesh [V].

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inVoltage = solver.outVoltage


Obtain the provided field:

>>> solver.outVoltage(mesh)

ThresholdSearchCyl.outWavelength(n=0)

Provider of the computed wavelength [nm].

Parameters: n (int) – Computed mode number. Value of the wavelength [nm].

You may obtain the number of different values this provider can return by testing its length.

Example

Connect the provider to a receiver in some other solver:

>>> other_solver.inWavelength = solver.outWavelength


Obtain the provided value:

>>> solver.outWavelength(n=0)
1000


Test the number of provided values:

>>> len(solver.outWavelength)
3


Provider class: plask.flow.WavelengthProvider

Receciver class: plask.flow.WavelengthReceiver

Attribute Details¶

ThresholdSearchCyl.diffusion = DiffusionCyl()

electrical.diffusion.DiffusionCyl solver used for electrical calculations.

ThresholdSearchCyl.dlam = 0.02

Wavelength step.

Step, by which the wavelength is swept while searching for the approximate mode.

ThresholdSearchCyl.electrical = ShockleyCyl()

electrical.shockley.ShockleyCyl solver used for electrical calculations.

ThresholdSearchCyl.gain = FreeCarrierCyl()

gain.freecarrier.FreeCarrierCyl solver used for gain calculations.

ThresholdSearchCyl.id

Id of the solver object. (read only)

Example

>>> mysolver.id
mysolver:category.type

ThresholdSearchCyl.initialized

True if the solver has been initialized. (read only)

Solvers usually get initialized at the beginning of the computations. You can clean the initialization state and free the memory by calling the invalidate() method.

ThresholdSearchCyl.lpm = 0

Angular mode number $m$.

0 for LP0x, 1 for LP1x, etc.

ThresholdSearchCyl.lpn = 1

Radial mode number $n$.

1 for LPx1, 2 for LPx2, etc.

ThresholdSearchCyl.maxiter = 50

Maximum number of root finding iterations.

ThresholdSearchCyl.maxlam = optical.lam0

Maximum wavelength considered for the optical mode search.

ThresholdSearchCyl.optical = EffectiveFrequencyCyl()

optical.effective.EffectiveFrequencyCyl solver used for optical calculations.

ThresholdSearchCyl.optical_resolution = (800, 600)

Number of points along the horizontal and vertical axes for the saved and plotted optical field.

ThresholdSearchCyl.quick = False
ThresholdSearchCyl.skip_thermal = False

Skip thermal computations.

The structure is assumed to have a constant temperature. This can be used to look for the threshold under pulse laser operation.

ThresholdSearchCyl.tfreq = 6.0

Number of electrical iterations per single thermal step.

As temperature tends to converge faster, it is reasonable to repeat thermal solution less frequently.

ThresholdSearchCyl.thermal = StaticCyl()

thermal.static.StaticCyl solver used for thermal calculations.

ThresholdSearchCyl.vmax = None

Maximum voltage to search threshold for.

It should be above the threshold.

ThresholdSearchCyl.vmin = None

Minimum voltage to search threshold for.

It should be below the threshold.

ThresholdSearchCyl.vtol = 1e-05

Tolerance on voltage in the root search.