Laser line mirrors need to be manufactured with special dielectric coating coatings that provide a high damage threshold, making them ideal for use with a variety of high-power CW or pulsed laser sources. Alfa Chemistry specializes in the efficient development of advanced dielectric coating designs. We use high-energy ion beam sputtering (IBS) to manufacture high reflectivity and low-loss laser dielectric mirror coatings to form extremely dense films that ensure consistent performance under harsh temperature and humidity conditions. Alfa Chemistry's design team will recommend the best coating for your high-power laser application!
Our Laser Line Dielectric Coatings
The internal design team at Alfa Chemistry will collaborate closely with our clients to create specialized laser dielectric mirror coatings that satisfy their performance requirements. The customer specifies a particular wavelength range, angle of incidence, substrate refractive index, incident medium, and polarization to achieve the best coating performance. Typical designs offer effective narrow-band reflectivity over the wavelength range requested by the user. Designs can be improved for multi-band applications needing strong environmental stability or laser line center wavelengths ranging from 325nm to 1550nm.
Fig 1. Measured reflectance and transmission spectra for IAD E-beam silicon dioxide deposited on SF11 substrate using Perkin Elmer Lambda 900 spectrophotometer between 350 nm and 2200 nm. (Sidqi N, et al. 2019)
Due to the coating's decreased susceptibility to high humidity and fluctuating temperature conditions, our bespoke coatings are stable optical films with little to no spectrum shift. The coatings are suitable for direct deposition onto semiconductor materials, glass, wafers, fiber optic equipment, and wafers. The following set of coatings is extremely effective reflectors that are tailored for certain wavelength bands. We provide eight common dielectric coatings.
Specifications:
| Center Wavelength | Angle of incidence | Reflectivity per Surface | Damage Threshold |
|---|---|---|---|
| 325 nm | 0 ~ 45° | Rs,Rp>99% | 1000W/cm2 2J/cm2 |
| 441.8 nm | 0 ~ 45° | Rs,Rp>99% | 500W/cm2 2J/cm2 |
| 488 nm ~ 514.5 nm | 0 ~ 45° | Rs,Rp>99% | 500W/cm2 2J/cm2 |
| 532 nm | 0 ~ 45° | Rs,Rp>99% | 500W/cm2 2J/cm2 |
| 632.8 nm | 0 ~ 45° | Rs,Rp>99% | 500W/cm2 2J/cm2 |
| 1064 nm | 0 ~ 45° | Rs,Rp>99% | 500W/cm2 2J/cm2 |
| 1300 nm | 0 ~ 45° | Rs,Rp>99% | 500W/cm2 2J/cm2 |
| 1550 nm | 0 ~ 45° | Rs,Rp>99% | 500W/cm2 2J/cm2 |
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. We also examine materials grown using electron beam and thermal evaporation as well as magnetron sputtering. The refractive indices and the extinction coefficients of the coatings were calculated from transmission and reflectance spectrophotometric data. The surface roughness of single-layer coatings was measured using atomic force microscopy and the scatter of the thin film coatings was approximated from roughness measurements.
If you need technical advice, please contact our technical team to learn more about our high-quality services.
Reference
- Sidqi N, et al. (2019). "Comparative Study of Dielectric Coating Materials for Micro-cavity Applications." Optical Materials Express. 9(8): 3452-3468.