finesse.components.mirror.Mirror

Overview

class finesse.components.mirror.Mirror(name, *args, **kwargs)

Bases: Surface

The mirror component represents a thin dielectric surface with associated properties such as reflectivity, tuning, and radius of curvature. Mirror components are nominally at normal incidence to the beams. It has two optical ports p1 and p2 which describes the two beams incident on either side of this surface. The surface normal points out of the mirror on the p1 side. A mirror also has a mechanical port mech which has nodes for longitudinal, yaw, and pitch motions. These mechanical nodes are purely for exciting small signal oscillations of the mirror. Static offsets in longitudinal displacements are set by the phi parameter (in units of degrees), yaw by the xbeta parameter, and pitch the ybeta parameter.

Parameters

namestr

Name of newly created mirror.

Rfloat, optional

Reflectivity of the mirror; defaults to 0.5.

Tfloat, optional

Transmittance of the mirror; defaults to 0.5.

Lfloat, optional

Loss of the mirror; defaults to 0.0.

phifloat, optional

Tuning of the mirror (in degrees); defaults to 0.0.

Rcfloat or container of two floats, optional

The radius of curvature of the mirror (in metres); defaults to a flat mirror (Rc=np.inf). Astigmatic mirrors can also be set with Rc=(Rcx, Rcy). A positive value results in a concave mirror on the p1 side of the mirror.

xbeta, ybetafloat, optional

Misalignment of the mirror in yaw and pitch in units of radians

misalignedbool, optional

When True the mirror will be significantly misaligned and assumes any reflected beam is dumped. Transmissions will still occur.

Attributes

Attributes are set via the Python API and not available via KatScript.

surface_mapfinesse.knm.Map

Decsribes the surface distortion of this mirror component. Coordinate system to the map is right-handed with the postive-z direction as the surface normal on the port 1 side of the mirror.

Properties

Mirror.abcd11x	Numeric ABCD matrix from port 1 to port 1 in the tangential plane.
Mirror.abcd11y	Numeric ABCD matrix from port 1 to port 1 in the sagittal plane.
Mirror.abcd12x	Numeric ABCD matrix from port 1 to port 2 in the tangential plane.
Mirror.abcd12y	Numeric ABCD matrix from port 1 to port 2 in the sagittal plane.
Mirror.abcd21x	Numeric ABCD matrix from port 2 to port 1 in the tangential plane.
Mirror.abcd21y	Numeric ABCD matrix from port 2 to port 1 in the sagittal plane.
Mirror.abcd22x	Numeric ABCD matrix from port 2 to port 2 in the tangential plane.
Mirror.abcd22y	Numeric ABCD matrix from port 2 to port 2 in the sagittal plane.
Mirror.refractive_index_1	Refractive index on size 1 (port 1)
Mirror.refractive_index_2	Refractive index on size 2 (port 2)

Methods

Mirror.__init__(name[, R, T, L, phi, Rc, ...])
Mirror.ABCD(from_node, to_node[, direction, ...])	Returns the ABCD matrix of the mirror for the specified coupling.
Mirror.optical_equations()