The 3MD20ER.4 Broadband Gold Mirror is an excellent general purpose, broadband reflector. This 30.0 mm (1.181 inch) diameter mirror is made from a 6.0 mm thick Borofloat 33 substrate which is coated with the ER.4 gold coating. Borofloat 33 has low thermal expansion and is an excellent substrate for most applications. The ER.4 protected gold coating is ideal for applications requiring broadband reflectance in the near IR to the far IR. A multilayer dielectric overcoat provides protection to the gold from the environment. The 3MD20ER.4 has an average reflectivity greater than 96% from 6501700 nm and greater than 98% from 1.720 &mu,m. This mirror has a &lambda,/10 surface flatness and a 15-5 surface quality.
Технические характеристики
- Wavelength Region Broadband
- Wavelength Range 650-20000 nm
- Mirror Shape Round
- Diameter 30.0 mm
- Mirror Size Ø30.0 mm
- Thickness 6.0 mm
- Material Borofloat® 33
- Coating Type Protected Gold
- Coating Code ER.4
- Surface Quality 15-5 scratch-dig
- Surface Flatness &lambda,/10 at 632.8 nm
- Substrate Number 3MD20
- Angle of Incidence 0-45°
- Clear Aperture &ge,central 80% of diameter
- Back Surface Ground
- Reflectivity Ravg>96%, Rmin>92% @ 650-1700 nmRavg>98%, Rmin>96% @ 1.7-20 m
- Damage Threshold 0.5 J/cm² with 10 ns pulses at 1064 nm, 20Hz
- Diameter Tolerance +0/-0.13 mm
- Thickness Tolerance ±0.25 mm
- Chamfers 0.38–1.14 mm face width
- Chamfers Angle Tolerance 45° ±15°
- Cleaning See How to Clean Optics
