The 20QM20EM.15 is a High Energy Excimer Laser Mirror, 50.8 mm in diameter, 6.35mm thick, and is coated for 248 nm, optimized for 45° angle of incidence.
High-Energy Nd:YAG Laser Mirrors are manufactured using high purity fused silica substrates and ultrahard dielectric coatings. This mirror has been tested and certified to withstand high-energy pulses and have a high damage threshold. Meticulous production procedures guarantee they will withstand fluences greater than 10 J/cm2 at 1064 nm. The coating is highly durable and will withstand repeated cleaning. We offer Nd:YAG mirrors for the fundamental 1064, frequency-doubled 532, frequency-tripled 354.7, and frequency-quadrupled 266 nm laser lines at either 0° or 45° incidence angle. A dual-wavelength mirror for 1064 and 532 nm is also available. Reflectivity is greater than 99.7% for s-polarization and greater than 99% for p-polarization. These mirrors are available in 25.4 or 50.8 mm diameters.
| Model | 20QM20EM.15 |
|---|---|
| Mirror Shape | Round |
| Wavelength Range | 248 nm |
| Diameter | 2.0 in. (50.8 mm) |
| Thickness | 0.38 in. (9.65 mm) |
| Material | UV grade fused silica |
| Coating Type | Low Loss Dielectric |
| Surface Quality | 10-5 scratch-dig |
| Coating Code | EM.15 |
| Clear Aperture | ≥central 80% of diameter |
| Reflectivity | Rs, Rp>99% @ 248 nm |
| Angle of Incidence | 45° |
| Surface Flatness | ≤λ/10 at 632.8 nm over the clear aperture |
| Chamfers | 0.38–1.14 mm face width |
| Chamfers Angle/Tolerance | 45° ±15° |
| Diameter Tolerance | +0/-0.25 mm |
| Thickness Tolerance | ±0.5 mm |
| Wedge | ≤3 arc min |
| Damage Threshold | 1 MW/cm² CW and 1 J/cm², 10 nsec pulses, 10 Hz @ 248 nm |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended |
