« Back to Precision Optics

Plate & Cube Beamsplitters

Plate & Cube Beamsplitters

Optimized beamsplitter designs from G&H demonstrate superior laser damage performance for each unique wavelength, split, and incident angle combination. High-energy coatings are optimized to accommodate specific application requirements.
For maximum power handling, we recommend optically contacted cubes or plate beamsplitters. For durability and handling, G&H suggests cube beamsplitters.
Cube beamsplitters can divide the incident beam based on polarization (S or P) or power (ratio of energy into each arm). The S and P polarization components are separated by reflecting the S component at the dielectric beamsplitter coating while the P component passes through the cube. Alignment markings on the cubes ensure correct placement in the optical path. Beamsplitting cubes are easy to mount and mechanically durable. Cube beamsplitters from G&H may be provided cemented, optically contacted, or even air-spaced. For some applications, higher power handling and lighter weight is required.
Plate & Cube Beamsplitters
Plate beamsplitters display intrinsically higher beam power handling capability than cube beamsplitters. Plate varieties are preferred in high laser energy applications, or where cost or weight limits on the assembly come into play. They are typically designed to work at 45° angles, though other angles can often be specified.
There are two trade-offs for the convenience of the plate beamsplitter:
  1. The physics of the plate component generates a beam offset of the secondary beam. This offset distance is dependent upon the thickness of the substrate.
  2. A ghost beam is generated by the reflection of the secondary beam as it encounters the back surface of the substrate. An anti-reflection coating on the exit surface of the substrate can minimize the ghost beam.

Beamsplitter types and selection factors

Selection of the appropriate beamsplitter design is dependent upon several factors:
  • Polarizing or non-polarizing
  • Non-polarizing beam ratio (examples may be 50-50, 70-30, 90-10)
  • Wavelength separation
  • Power handling (high power or high incident laser energy)
  • Ghost reflection tolerance
  • Beam displacement tolerance
  • Cube or plate
Specifications Plate Cube
Wavelength ranges
  • 240 nm to 5000 nm
  • 240 nm to 5000 nm
Dimensions
  • 5 – 150 mm diameter
  • 5x5x5mm-- 50x50x50mmtypical
Beamsplitting options
  • Polarizing or non-polarizing
  • Beam ratios from 90-10 to 50-50
  • Wavelength separation
  • Long pass or short pass
  • Polarizing or non-polarizing
  • Beam ratios from 90-10 to 50-50
  • Wavelength separation
  • Long pass or short pass
Coating options
  • E-beam dielectric optimized for LIDT
  • Backside AR coating to minimize ghosting
  • Low phase shifting coating designs
  • E-beam dielectricoptimized for LIDT
Assembly options
  • Cemented
  • Optically contacted
  • Air-spaced
G&H has received IS09001 certification across all of its manufacturing sites while AS9100C certification has been achieved at select facilities.