High Energy Excimer Laser Mirror, 50.8 mm, 45°, 248 nm

The 20QM20EM.15 is a 50.8 mm diameter, 9.65 mm thick High Energy Excimer Laser Mirror coated for 248 nm. Its reflectivity at this wavelength is greater than 99% for both s- and p-polarization, and it is optimized for 45° AOI.

Newport's High Energy Excimer Laser Mirrors feature ultra-hard dielectric coatings on UV Grade Fused Silica substrates to resist damage from high power lasers. The coating is highly durable and will withstand repeated cleaning.

Specifications

Technical Specs

Wavelength Region
UV
Wavelength Range
248 nm
Mirror Shape
Round
Diameter
50.8 mm
Material
UV Grade Fused Silica
Coating Type
Low Loss Dielectric
Coating Code
EM.15
Reflectivity
R_s, R_p>99% @ 248 nm
Surface Quality
10-5 scratch-dig
Surface Flatness
λ/10 at 632.8 nm
Wedge
≤3 arc min

Angle of Incidence
45°
Clear Aperture
≥central 80% of diameter
Thickness
9.65 mm
Thickness Tolerance
±0.5 mm
Diameter Tolerance
+0/-0.25 mm
Chamfers
0.38–1.14 mm face width
Chamfers Angle Tolerance
45° ±15°
Cleaning
See How to Clean Optics
Damage Threshold
3 KW/cm²
1 J/cm² @ 0.1-100 ns, 10Hz

Wavelength Region
UV
Wavelength Range
248 nm
Mirror Shape
Round
Diameter
50.8 mm
Material
UV Grade Fused Silica
Coating Type
Low Loss Dielectric
Coating Code
EM.15
Reflectivity
R_s, R_p>99% @ 248 nm
Surface Quality
10-5 scratch-dig
Surface Flatness
λ/10 at 632.8 nm
Wedge
≤3 arc min

Angle of Incidence
45°
Clear Aperture
≥central 80% of diameter
Thickness
9.65 mm
Thickness Tolerance
±0.5 mm
Diameter Tolerance
+0/-0.25 mm
Chamfers
0.38–1.14 mm face width
Chamfers Angle Tolerance
45° ±15°
Cleaning
See How to Clean Optics
Damage Threshold
3 KW/cm²
1 J/cm² @ 0.1-100 ns, 10Hz

Resources & Downloads

Other

20QM20EM.15 RoHS Certificate(264.1 kB, PDF)
20QM20EM.15_ROHS2-2021.pdf(0, PDF)

2D Product Drawings

QM20 Series Drawing(145.5 kB, PDF)

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