Polka-Dot Beamsplitters
Shimadzu optical device for polychromatic light source splitting and as a substitute for monochromator sector mirrors
Features
- Wide wavelength range from UV to IR
- Low dependence on angle of incidence
- Two types available: standard (to 2200 nm) and high-grade (to 3200 nm) types
Polka-Dot Beamsplitters comprise a glass substrate with an aluminum coating in a polka-dot pattern. Incident light is reflected from the coated areas but transmitted through the non-coated areas. This splitting mechanism achieves a light split ratio that is almost independent of the light angle of incidence, unlike dielectric beamsplitters.
Shimadzu Polka-Dot Beamsplitters are based on a synthetic quartz substrate that permits application across a wide wavelength range from the ultraviolet to the infrared.
Product list (table of code numbers)
*1: For example, "T70/R30" indicates a light ratio of 70% transmittance(T) and 30% reflectance(R).
Refer to Figures 1 and 2 for detailed characteristics.
Common specifications
| Specifications | Nominal light ratio | ||
|---|---|---|---|
| T50/R50 | T70/R30 | T30/R70 | |
| Transmittance*2 | 50(+0/-5) % | 70(+0/-5) % | 30(+0/-5) % |
| Angle of Incidence | 0° to 45° | ||
| Wavelength Range | Standard : 250 to 2200 nm | ||
| High-grade : 250 to 3200 nm | |||
| Substrate | UV Grade Fused Silica | ||
| Coating | AL+MgF2 | ||
| Dimension Tolerance | ±0.1 mm | ||
| Clear Aperture | Full surface, less outer 1.5 mm | ||
| Aperture Spacing | 0.3 mm | ||
| Surface Quality | 80-50 (MIL-O-13830A) | ||
| Maximum Temperature | 150 °C | ||
*2: At 555 nm wavelength and 0° angle of incidence
※RoHS compliant (Directive 2011/65/EU + (EU)2015/863 on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment)
Measured spectral characteristics (values not guaranteed)
