Silver-coated reflective film: ideal for femtosecond lasers

Silver coated reflective film is an advanced coating product with extremely high partial reflectance in the visible light to near infrared range. It can be effectively applied to femtosecond lasers and other fields to provide users with excellent performance and experience. In this paper, we will analyze the unique and novel viewpoint of silver-coated reflective film, and analyze its advantages and applicability through examples and data demonstration.

1. High reflectivity of silver-plated reflective film

1.1 High reflectance in visible to near-infrared range

The average reflectance (Ravg) of the silver-coated reflective film is greater than 97.5% in the range of 450-2000um, and the reflectance (Ravg) of the 2-20um band is also higher than 96%. This makes the silver-coated reflective film the more reflective choice of all metal mirrors.

1.2 Suitable for femtosecond laser high reflectivity characteristics

Due to the high reflectivity of the silver-coated reflective film in the range of 450 nm-20 µm, it is well suited for use in femtosecond lasers. Femtosecond lasers usually work in this band range, and the silver coated reflective film can provide extremely high reflection performance, effectively protect the luminous parts of the laser, and improve the quality of the laser beam.

2. Further improve the performance of the surface protection

2.1 Application of SiO2 film layer

The outer layer of the silver-coated reflective film is coated with a 100nm thick SiO2 film layer, which can effectively protect the silver film and improve its scratch resistance and oxidation resistance. This design makes the silvered reflective film more suitable for daily use and extends its life.

2.2 Pay attention to the high humidity environment and wiping rules

Although the silver film is soft and easy to scratch and oxidize, high humidity environments should be avoided during use, and it should be wiped carefully. These considerations will help to maintain the best use of the silvered reflective film.

3. Analysis of advantages of silver-coated reflective film

3.1 Finish and profile accuracy

The finish of the silvered reflective film is 40/20, and the surface accuracy is in the range of 1/4~1/10@633nm. This means that the silver-coated reflective film has a highly smooth surface and good profile accuracy, which can effectively reduce optical distortion and improve the quality of the optical system.

3.2 High damage threshold

The damage threshold of silver-coated reflective film is 3 J/cm2 at 1.064µm, 10 ns, 10 Hz, Ø1.000 mm. This means that under high energy laser irradiation, the silver-coated reflective film can withstand higher energy density, reducing lens failure and system failure due to laser damage.

Conclusion:

As an advanced optical material, the silver coated reflective film is an ideal choice for femtosecond lasers and other applications due to its high reflectivity. Reasonable design and application of protective layer can extend the service life of silvered reflective film. High finish, good profile accuracy and high damage threshold are also advantages. In general, the silver coated reflective film has a broad application prospect in the optical field, and provides a reliable support for the performance improvement of optical systems.