Beamsplitter¶
-
beamsplitter¶
bs
Beamsplitter The beamsplitter component represents a thin dielectric surface with associated properties such as reflectivity, tuning, and radius of curvature. It has four optical ports p1, p2, p3, and p4 which describe the four beams incident on either side of this surface. p1 and p2 are on side 1 and p3 and p4 are on side 2. A 100% transmissive beamsplitter will transmit all of the light incident at p1 to p3.
It 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), misalignments in yaw by the xbeta parameter, and pitch the ybeta parameter. Macroscopic angle of incidence of the beamsplitter is set by the
alpha
parameter. Beamsplitters physically operate the same as mirror components, except for the non-normal angle of incidence option.- Syntax
bs name R=none T=none L=none phi=0 alpha=0 Rc=inf xbeta=0 ybeta=0
- Required
name
: Name of newly created beamsplitter.- Optional
R
: Reflectivity of the beamsplitter.T
: Transmissivity of the beamsplitter.L
: Loss of the beamsplitter.phi
: Microscopic tuning of the beamsplitter (in degrees).alpha
: Angle of incidence (in degrees)Rc
: Radius of curvature (in metres); defaults tonumpy.inf
to indicate a planar surface.xbeta
,ybeta
: Angle of misalignment in the yaw plane (xbeta) and pitch (ybeta), respectively (in radians); defaults to 0.
Ports¶
The order of the ports is shown below. In a typical Michelson interferometer the order of the ports is: input-reflection-transmission-output.
Parameters¶
Listed below are the parameters of the beamsplitter component. Certain parameters can be changed during a simulation and some cannot, which is highlighted in the can change during simulation column. These changeable parameters can be used by actions such as
xaxis
orchange
. Those that cannot must be changed before a simulation is run.Name Description Units Data type Can change during simualation R Reflectivity None float ✓ T Transmission None float ✓ L Loss None float ✓ phi Phase degrees float ✓ alpha Angle of incidence (-90 <= alpha <= 90) degrees float ✗ Rcx Radius of curvature (x) m float ✓ Rcy Radius of curvature (y) m float ✓ xbeta Yaw misalignment radians float ✓ ybeta Pitch misalignment radians float ✓