Alfa Chemistry offers custom reflective coating services for a wide range of functions involving anti-reflective coatings, highly reflective metallic coatings, and partially reflective coatings. To satisfy the needs of the customer, we will design a substrate-based film. In addition, we'll test the film's reflection using cutting-edge testing gear.
Highly Reflective Coating
Highly reflective (HR) coatings are frequently used to reduce losses when reflecting lasers and other light sources because they offer strong reflection in specific wavelength regions. HR coatings include highly reflective dielectric coatings and metallic coatings. Due to their low absorption characteristics, HR coatings offer better and more efficient spectrum performance.
Alfa Chemistry specializes in customizing HR coatings for demanding laser applications requiring ultra-low scattering and absorption properties. Beyond the designated reflective band, these optical coatings can be further tailored to offer additional high-pass or low-pass wavelength performance.
| Single Wavelength HR Coating | Dual Wavelength HR Coating | |
|---|---|---|
| Substrate | Fused silica, BK7 | Fused silica, BK7 |
| Surface Quality | 40-20 | 40-20 |
| Surface Figure | <λ/10 @ 632.8nm | <λ/10 @ 632.8nm |
| Chamfer | 0.5mm×45° | 0.5mm×45° |
| Incident | 0°/45° | 0°/45° |
| Clear Aperture | > Central 85% of diameter | > Central 85% of diameter |
| Coating Material | Electron beam deposited dielectric multi-layers | Electron beam deposited dielectric multi-layers |
| Wavelength | 350-650 nm, 420-670 nm, 650-1050 nm, 1050-1550 nm | 266nm/532nm, 351nm/1053nm, 532nm/1064nm, 6328nm/1064nm |
| Reflectance | <0.5% | |
| Residual Reflectance | 99%/99.5% |
Partially Reflective Coating
Coatings that are partially reflective (PR) perform an attenuation function. It has a partially transmissive coating on one surface and an anti-reflective coating on a second surface. When the angle of incidence (AOI) is zero degrees, a portion of the light beam is reflected back. The power ratio between the two beams is determined by the coating. Alfa Chemistry can design PR coatings with reflectivity from 10% to 99.7% to achieve the desired performance.
For optical components that beam split in a variety of optical areas, from UV to IR, we provide unique ultra-broadband PR coatings. With a tolerance of roughly 5%, broadband PR coatings are commonly employed for beam splitting at 45-degree angles to broadband light, such as 50/50, 40/60, and 30/70.
| Single Wavelength PR Coating | |
|---|---|
| Substrate | Fused silica, BK7 |
| Surface Quality | 40-20 |
| Surface Figure | <λ/10 @ 632.8nm |
| Chamfer | 0.5mm×45° |
| Incident | 0°/45° |
| Clear Aperture | > Central 85% of diameter |
| Coating Material | Electron beam deposited dielectric multi-layers |
| Wavelength | 190nm-10.6μm |
| Reflectance and Tolerance | 10±2%, 20±3%, 30±3%, 40±3%, 50±3%, 60±3%, 70±3%, 80±3%, 90±2%, 95±1.5%, 98±1%, 99±0.5% |
Coating Engineering
The foundation of Alfa Chemistry's competence is optical coating engineering. We draw on our wealth of knowledge to offer our clients the most reliable and powerful solutions. We are experts in developing unique coatings, enhancing processes, and designing coatings. We have the Ebeam, IBS, and IAD technologies to give you a variety of options so we can give you the best solution.
If you need technical advice, please contact our technical team to learn more about our high-quality services.