Knowledge points about Optical Coating

Definition of Optical Coatings

Optical coatings are protective layers applied to optical components to protect the lens and enhance its performance by improving light transmission, changing reflection characteristics, or modifying the polarization of transmitted light. The composition, thickness, and layering of these materials are carefully controlled to achieve the desired light characteristics.

At Mok Optics, we offer a comprehensive selection of optical coatings, including:

1. Anti-reflective coatings

2. High-reflective coatings

3. Partially reflective coatings

4. Specialty coatings

Whether you need a basic single-layer anti-reflective coating or a complex multi-layer dielectric stack, we can produce what you need. You can consult us with your requirements and we can give you a professional recommendation.

Types of Optical Coatings

1. AR Coatings

We offer a variety of dielectric anti-reflective coatings, both broadband and narrowband. One durable option is magnesium fluoride, available in single-layer and multi-layer configurations. These coatings are designed to minimize unwanted reflections. AR coatings designed specifically for specific wavelengths can reduce this reflection to less than 0.1%.

2. Reflective Coatings

Reflective coatings enhance the reflectivity of a surface. Dielectric mirror coatings consisting of alternating high- and low-refractive index materials (such as ZnS or TiO2 paired with MgF or SiO2) can achieve reflectivity up to 99.9% in a specific wavelength range. In comparison, glass optics with aluminum coatings can reflect 88-92% of visible light, while silver coatings reflect 95-99% in the far infrared.

3. Polarizing Coatings

Polarizing coatings are made by interference effects in thin films of birefringent materials or multilayer dielectric structures. These coatings can be designed to work effectively at a 45-degree angle of incidence, reflecting light at 90 degrees. They can be applied to lenses or optical windows as polarizing prisms.

4. Transparent Conductive Coatings

These specialized coatings allow high visible light transmittance while providing electrical conductivity. They can be used to shield devices from electromagnetic interference and can be used as transparent electrodes. With resistivity ranging from 4 to 1,000 ohms per square, these coatings are tailored for specific applications, with common materials including indium tin oxide (ITO) and aluminum-doped zinc oxide (AZO).

5. Dichroic Filters

These highly efficient filters selectively separate or combine light beams based on wavelength, making them ideal for a variety of optical applications.

6. Narrow Bandpass Filters

These filters can isolate specific wavelength ranges with high accuracy, which is critical for applications that require precise wavelength selection.

7. Multi-Bandpass Filters

These filters allow multiple wavelength bands to pass while blocking others, providing versatility to optical systems.

8. Hydrophobic Film Coatings

These coatings provide enhanced moisture resistance and durability, which is critical for applications exposed to environmental challenges.

At Mok Optics, our expertise in optical coatings ensures that we can meet your specific requirements with precision and reliability.

If you are interested, please feel free to contact us, here are our contact information:

Email: info@mokoptics.com​