Dielectric Mirror, High Reflector, 50.8 mm, 0-50°, 350-1100 nm, 40-20
The 20Q620BB.HR2 BroadBeam High Reflector Laser Mirror is 50.8 mm in diameter, 9.4 mm thick, and is coated for 350-1100 nm, optimized for 0-50° angle of incidence. BroadBeam High Reflectors have an average reflectivity of 97.5% or better. They are manufactured using UV grade fused silica substrates and metal-dielectric hybrid coating. The BB.HR2 coating covers wavelengths from the UV to the visible to the IR.
UV Fused Silica Substrates
Fused Silica is synthetic amorphous silicon dioxide of extremely high purity. This non-crystalline, colorless silica glass combines a low content of inclusions with high refractive index homogeneity, a very low thermal expansion coefficient, and excellent transmittance in the wavelength regime from UV to NIR. As a result, these mirrors will perform better with temperature fluctuations and is ideal for high-energy laser applications due to its high energy damage threshold. For more information, please see our Optical Materials technical note.
Extremely Broad Wavelength Range With High Reflectivity
Broadbeam mirrors feature unprecedented specifications at an incredible value. These mirrors feature Newport’s proprietary metal-dielectric hybrid coating which provides exceptional reflectivity performance Ravg>97.5% over a very large wavelength range 350 - 1100 nm, 0 - 50 ͦ angle of incidence for both S and P polarizations. Because of the very broad wavelength range and high reflectivity efficiency, the mirror can be used with many different laser wavelengths and can easily replace all of the mirrors in your current system.
More Durable Metal Dielectric Coatings
In addition to the high reflectivity across the ultra-broadband wavelength range, the Broadbeam mirrors also feature a more durable coating compared to the traditional metallic mirrors. Typically metallic coatings suffer from more rapid degradation over time when compared to dielectrics. Broadband mirrors use a metal dielectric hybrid coating that is more resistant to humidity, thermal changes, abrasion and salt exposure, providing long-term value for your applications.
Specifications
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Wavelength Region
Broadband
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Wavelength Range
350-1100 nm
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Mirror Shape
Round
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Diameter
50.8 mm
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Mirror Size
Ø50.8 mm
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Thickness
9.4 mm
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Material
UV Grade Fused Silica
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Coating Type
Metal-Dielectric
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Coating Code
BB.HR2
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Surface Quality
40-20 scratch-dig
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Surface Flatness
λ/10 at 632.8 nm
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Substrate Number
20Q620
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Wedge
30 ± 15 arc min
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Angle of Incidence
0 - 50°
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Clear Aperture
≥central 80% of diameter
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Back Surface
Commercial Polished
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Reflectivity
Ravg>97.5% @ 0-50° AOI @ 350-1100 nm
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Damage Threshold
1.3 J/cm² @ 355 nm, 2 J/cm² @ 532 nm, 2.3 J/cm² @ 1064 nm for 20ns pulses
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Diameter Tolerance
+0/-0.13 mm
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Thickness Tolerance
±0.38 mm
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Chamfers
<0.5 mm face width
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Chamfers Angle Tolerance
45° ±15°
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Cleaning
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Wavelength Region
Broadband
-
Wavelength Range
350-1100 nm
-
Mirror Shape
Round
-
Diameter
50.8 mm
-
Mirror Size
Ø50.8 mm
-
Thickness
9.4 mm
-
Material
UV Grade Fused Silica
-
Coating Type
Metal-Dielectric
-
Coating Code
BB.HR2
-
Surface Quality
40-20 scratch-dig
-
Surface Flatness
λ/10 at 632.8 nm
-
Substrate Number
20Q620
-
Wedge
30 ± 15 arc min
-
Angle of Incidence
0 - 50°
-
Clear Aperture
≥central 80% of diameter
-
Back Surface
Commercial Polished
-
Reflectivity
Ravg>97.5% @ 0-50° AOI @ 350-1100 nm
-
Damage Threshold
1.3 J/cm² @ 355 nm, 2 J/cm² @ 532 nm, 2.3 J/cm² @ 1064 nm for 20ns pulses
-
Diameter Tolerance
+0/-0.13 mm
-
Thickness Tolerance
±0.38 mm
-
Chamfers
<0.5 mm face width
-
Chamfers Angle Tolerance
45° ±15°
-
Cleaning