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Types of Thin Film Coatings:

  1. Anti-Reflective (AR) Coatings: These coatings are designed to reduce the reflection of light at the surface of an optical component, increasing transmission and minimizing unwanted glare.
  2. High-Reflective (HR) Coatings: HR coatings are used to maximize reflection at a specific wavelength or a range of wavelengths. They are commonly used in mirrors and laser applications.
  3. Dichroic Coatings: These coatings selectively reflect or transmit light of certain wavelengths while absorbing others. They are often used in applications like beam splitters and color filters.
  4. Filter Coatings: These coatings are designed to transmit or block specific wavelengths or ranges of wavelengths, allowing for precise spectral filtering.
  5. Beamsplitter Coatings: Beamsplitters divide incident light into two or more components, often reflecting a portion of the light and transmitting the rest. They are widely used in various optical setups.

Advantages of Thin Film Coatings:

  • Improved Performance: Coatings can significantly enhance the optical properties of components, such as increasing light transmission or reducing unwanted reflections.
  • Customization: Coating designs can be tailored to specific wavelengths or wavelength ranges, allowing for precise control over optical behavior.
  • Reduced Losses: Coatings can minimize losses due to reflections or absorption, which is particularly important in high-performance optical systems.
  • Versatility: Thin film coatings can be applied to a wide range of substrates, including glass, plastics, metals, and more.
  • Cost-Effectiveness: By optimizing optical properties through coatings, it's often possible to achieve desired performance without resorting to complex and expensive designs.

Methods of Coating Deposition:

  1. Physical Vapor Deposition (PVD): This includes techniques like electron beam evaporation and sputtering, where a material is vaporized and deposited onto the substrate.
  2. Chemical Vapor Deposition (CVD): In this process, gaseous reactants chemically react on the substrate to form a thin film.
  3. Sputtering: This involves bombarding a target material with ions to release atoms that then deposit onto the substrate.
  4. Evaporation: The material to be coated is heated until it vaporizes and then condenses onto the substrate.

Thin film coatings are crucial for achieving desired optical characteristics in a wide range of applications, from consumer electronics to scientific research and industrial processes. The precision and control offered by these coatings play a vital role in shaping how light interacts with optical components.

Thin Film Coating

Co2 Coating 

Thin Film Coatings - CO2 Coatings on ZnSe


AR at 10.6μm

AR at 10.6μm and 633 nm (HeNe)

AR at 10.6μm and 650 nm (diode)

Beam Combiner at 10.6μm & 633-650nm

Beam Splitter (50%) at 10.6μm

Partial Reflector at 10.6μm 

AR 8μm to 128μm > 99%T

AR 3μm to 14μm > 95% T

AR 2.94μm >99.7% T

AR 2.5μm to 5μm > 99% T

 

 Co2 Coatings on Si 

 

CO2 Coatings on Silicon

00 Phase Shift Mirror at 10.6μm

900 Phase Shift Mirror at 10.6μm

Enhanced Silver at 10.6μm and VIS 

Infrared Coatings

Infrared Coatings on Germanium

Infrared Coatings on Zinc Selenide

Infrared Coatings on Zinc Sulfide Multispectral

Infrared Coatings on Gallium Arsenide

Infrared Coatings on Silicon

Reflective Coatings on Various Metals and Glass 

 

 

Thin Film Coatings

CO2 Coatings on ZnSe
AR at 10.6μm
AR at 10.6μm and 633 nm (HeNe)
AR at 10.6μm and 650 nm (diode)
Beam Combiner at 10.6μm & 633-650nm
Beam Splitter (50%) at 10.6μm
Partial Reflector at 10.6μm

CO2 Coatings on Silicon
00 Phase Shift Mirror at 10.6μm
900 Phase Shift Mirror at 10.6μm
Enhanced Silver at 10.6μm and VIS

Infrared Coatings
Infrared Coatings on Germanium
Infrared Coatings on Zinc Selenide
Infrared Coatings on Zinc Sulfide Multispectral
Infrared Coatings on Gallium Arsenide
Infrared Coatings on Silicon
Reflective Coatings on Various Metals and Glass.

APC: Coating Codes Definitions, Capabilities

AR - Anti Relective
AR,BBAR - Broad Band AR
AR,DBTR - Dual Band Total Reflector
AR,TR - Total Reflector
B/S - Broad Spectrum
B/S, DICH - Broad Spectrum Dichroic
BBAG BROAD BAND ANTI G
BBAR - Broad Band Anti Reflective
BBAR,AR - Broad Band Anti Reflective / Anti Reflective
BBAR,DBAR - Broad Band Anti Reflective / Dual Band Anti Reflective
BBB/S
BBPR - Broad Band Partial Reflector
BBTR - Broad Band Total Reflector
BBTR,BBAR - Broad Band Total Reflector / Broad Band Anti Reflective
BBTR,BBAR,AR
DBAR - Dual Band Anti Reflective
DBAR,TR , DBBAR, DBBF, DBBTR, DBTR, Filter
IR
Polarizer, PR, QBAR, RPR45, RPR90, TBAR, TBBAR, 
TBPR, TBTR, TR, TR,AR, TR,BBAR, TR,DBAR, TR/IR