Types of optical coatings

• Posted by Royan Luo March 8, 2022 Filed in Business #  #Active Optical Cable  99 views
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  What optical coatings do we offer you?

  Single-wavelength transmission enhancement films (V-coating)

  Single wavelength antireflective films are commonly used to control the loss rate of a specific wavelength in a specific wavelength range, becoming narrow band (single wavelength) antireflective films. Optics coated with single wavelength antireflective coatings are not only durable, but also have an increased laser damage threshold. It can be used for beam splitters with an incidence angle of 45°. It can be split over the entire spectral range, i.e. in the UV, visible and IR ranges, regardless of the direction of polarisation. Can be used in beam splitters, beam samplers, laser output couplers and high power applications.  

  Dual wavelength transmission-enhancing films (W-coating)

  Dual wavelength transmission enhancement films reduce the reflectivity of two specific wavelengths. They are commonly used in the visible and near-infrared wavelengths, for example in high-power CO 2 laser cutters. They operate at a wavelength of 1.06 µm in the infrared, but are not visible to the human eye. For safe and easy operation, red light (or other wavelengths of monochromatic light) is often required for indication. It is necessary that the optical element has good transmission at 1.06 μm and higher transmission at the specified operating wavelength s. For example, we offer dual wavelength transmission enhancement films: R < 0.25% @ 1064nm, R < 0.5% @ 532nm, AOI = 0°.    

  Dual wavelength transmission enhancement films are commonly used in CO 2 cutters, laser beauty devices, military optoelectronic devices such as infrared cameras, infrared guidance, laser pens, etc. Modern military optoelectronic instruments are increasingly designed with a focus on functional integration. Often, multi-spectral and multi-sensor technologies are integrated into a single device. As a result, dual-band transmission enhancement films are often used to reduce the weight and size of the instrument.

  

  Single-layer magnesium fluoride coatings

  Magnesium fluoride antireflective films have the advantages of low refractive index (N=1.38), low optical loss, transmission range from 120nm to 8000nm, high mechanical strength and high laser damage threshold. As a result, it is widely used in optical components, especially in UV optics. It can easily be applied by vacuum deposition and forms hard, durable coatings.

  One application.

  Depending on the field of application, such as imaging optics, laser optics, optical instruments, fibre optic communication, laser technology, integrated optics, cold light sources and other high-tech areas, the optical components applied can be coated with magnesium fluoride films in the different areas mentioned above. Optical elements can be optical lenses, optical prisms, optical windows and optical reflectors. The magnesium fluoride film serves to reduce the amount of reflected light.

  Aluminium coatings

  Aluminium film has a high reflectivity from the UV to the IR spectrum, but is easily oxidised, especially in the UV spectrum where it is unstable. Furthermore, it is easily damaged. Its surface cannot be wiped off even if it becomes dirty. Therefore, a protective coating on the aluminium film protects the metal film from oxidation or damage. Protective coatings provide an abrasion-resistant surface while maintaining the properties of the aluminium film . The protective coating has the effect of maintaining reflectivity at specific wavelengths in the spectral region. In other wavelengths of the spectrum, however, the reflectivity is sometimes reduced. In contrast, there are also special protective films that only increase the reflectance at specific wavelengths in the spectral region.

  CLZ Precision Optics has always been committed to innovation and science. We are constantly improving our methods and equipment for the production of optical components. If you have any questions, please contact us.