A beam splitter can have multiple cores, with diffractive beam splitters capable of generating large 1D or 2D arrays of output beams.

Conventional Beam Splitters

Standard beam splitters, such as plate or cube types, typically split an input beam into two output beams: one transmitted and one reflected. Polarizing beam splitters can separate light into two beams of orthogonal polarization states, but the number of distinct output beams remains two in most conventional designs . These are widely used in interferometers, cameras, and laser systems.

Diffractive Beam Splitters

For applications requiring more than two beams, diffractive beam splitters are used. These devices can divide a single input beam into multiple output beams, forming either a 1-dimensional array (1×N) or a 2-dimensional matrix (M×N), depending on the diffractive pattern etched on the optical element . Each output beam retains the same optical characteristics as the input, including size, polarization, and phase. The number of cores is limited primarily by the design of the diffractive pattern and the intended application, and can range from a few beams to dozens or even hundreds of beams in high-density arrays.

Practical Considerations

• The wavelength and angle of separation are critical in determining the number of beams a diffractive splitter can produce effectively .
• High-power laser applications often use diffractive splitters in combination with focusing lenses to create arrays of focused spots at a specific working distance.
• Conventional beam splitters are simpler and limited to two cores, while diffractive designs offer scalable multi-core outputs for advanced optical experiments and industrial applications. In summary, while standard beam splitters usually have two cores, diffractive beam splitters can have many cores, potentially forming large 1D or 2D arrays depending on the design and application requirements .