Our harmonic beamsplitters are designed to separate Nd:YAG laser harmonics after frequency multiplication. These 25.4 mm diameter optics are precision polished select grade fused silica coated with hard refractory multilayers for high damage threshold. A damage resistant antireflection coating for the transmitted harmonic is applied to the back surface to further improve transmission. Each coating design has been tested to guarantee reliable operation with high fluence Nd:YAG lasers.
Specifications
| Material |
UV Grade Fused Silica |
| Wavefront Distortion |
≤λ/4 at 632.8 nm over the clear aperture |
| Surface Flatness S1 |
≤λ/10 at 632.8 nm over the clear aperture |
| Surface Flatness, S2 |
≤λ/5 at 632.8 nm over the clear aperture |
| Clear Aperture |
> central 80% of diameter |
| Surface Quality |
10-5 scratch-dig |
| Diameter [in. (mm)] |
1.0 (25.4) +0/-0.25 |
| Thickness [in. (mm)] |
0.25 (6.35) ±0.5 |
| Wedge (arc min) |
≤3 |
| Chamfers |
0.25-0.76 mm face width x 45° ±15° |
| Angle of Incidence |
45 ° |
| Nominal Back Surface Reflectivity, S2 |
Rs <0.3 % |
| Durability |
MIL-M-13508, MIL-C-675C, MIL-C-14806 |
| Cleaning |
Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended see Care and Cleaning of Optics (see Care and Cleaning of Optics) |
| Damage Threshold |
5 MW/cm2 CW, 5 J/cm2 with 0.1–100 nsec pulses at 1064 nm, typical
2.5 MW/cm2 CW, 2.5 J/cm2 with 0.1–100 nsec pulses at 532 nm, typical |
Note: Reflection and transmission at wavelengths other than the specified harmonic wavelengths are uncontrolled and can vary significantly from the curve shown. Use of harmonic beamsplitters outside the design wavelengths is not recommended.
