THz Beam Splitters
We offer THz beam splitters of 2 types:
- single-pass beam splitter. It is used in optical schemes where radiation passes through beam splitter one time;- multi-pass beam splitter for interferometer scheme where beam passes throughsplitter several times.
The material of THz beam splitter is HRFZ-Si. These beam splitters provide transmittance/reflectance ratio about 54/46 (%) in the wide wavelength range without any coating.
Reflection and transmission curves are shown below.Fig.1 HRFZ-Si transmission and reflection (sample thickness - 5 mm).
1. Single-pass THz Beam Splitter
The specification for the single-pass beam splitter is the same as for a HRFZ-Si window. In fact plano-plano HRFZ-Si window could be used as single-pass beam splitter.Commom specification:
Material
HRFZ-Si
Type
plano-plano
Available sizes, mm
to 150
Diameter or cross-cut tolerance,mm
+0.0 /-0.1
Thickness tolerance, mm
+/0.1
Clear apperture, %
>=90
Parallelism, arc. min
3
Surface quality (two-sided polishing), scr/dig
60/40
Surface accuracy, mm
+/-0.01 deviation from ideal plane
2. Multi-pass THz Beam Splitter
The multi-pass beam splitter (for interferometers) as opposed to a single-pass beam splitter should be produced with a high accuracy.
Commom specification:
Material
HRFZ-Si
Type
plano-plano
Available sizes, mm
to 150
Diameter or cross-cut tolerance,mm
+0.0 /-0.1
Thickness tolerance, mm
+/-0.01
Clear apperture, %
>=90
Parallelism, arc. sec
5
Surface quality (two-sided polishing),
scr/dig60/40
Surface accuracy, λ@633 nm
1
The following multi-pass THz beam splitters are available from stock:
No. Diameter Thickness mm mm 1 40x30 3.5 2 50.8 3.5