New Models and Applications in Version 5.2a

Second Harmonic Generation in the Frequency Domain

This is a proof of principle example, describing the second harmonic generation (SHG) process using two Electromagnetic Waves, Frequency Domain interfaces: one for the fundamental wave and one for the second harmonic. The coupling between the waves is implemented using a domain Polarization feature for each interface. The results are compared against the analytical solution from the Slowly Varying Envelope Approximation (SVEA).

Single-Bit Hologram

This model simulates a bit-by-bit holographic data storage system, including data recording and retrieval. In the bit-by-bit holographic data storage system, the data is 1 bit, so the profiles of the object beam and the reference beam are identical in this model. In the recording process, the two beams intersect each other and make an interference fringe pattern, which is the hologram carrying the 1-bit data. During the retrieval process, the object beam is turned off and then the reference beam is diffracted by the hologram and creates the object beam.

Polarizing Beam Splitter

Polarizing beam splitter cubes consist of two right-angled prisms. A dielectric coating is evaporated on the hypotenuse prism surface. The dielectric coating is designed to transmit the part of the incident wave with the electric field polarized in the plane of incidence (p-polarization) and to reflect (in an orthogonal direction) the part of the incident wave with the polarization orthogonal to the plane of incidence (s-polarization). Two advantages of the cube design, compared to a plate design, are that ghost images are avoided, since there is only one reflecting surface here, and the translation of the transmitted output beam is very small, compared to the input beam. The latter advantage simplifies the alignment of optical systems using polarizing beam splitter cubes.

This app demonstrates the basic MacNeille design. This design consists of pairs of layers having consecutively high and low refractive indexes. In the internal dielectric stack, the waves hit the layer boundary at the Brewster angle. Thus, the s-polarization is reflected, whereas the p-polarization is transmitted at each internal layer boundary. A common design is to use zinc sulphide (ZnS) for the high refractive index layers (n = 2.3) and magnesium fluoride (MgF2) for the low refractive index layers (n = 1.38), and SF5 glass prisms (n = 1.673).

The app demonstrates how the phase functions required by the Electromagnetic Waves, Beam Envelopes interface can be defined using variables and global equations from the Global ODEs and DAEs interface. The variable definitions and the global equations are modified dynamically, as the number of layers in the dielectric stack is changed.