1. What is optical mirror?
The optical mirror realizes control beam and imaging by coating at least one side of optical substrates. Optical mirrors divide into plane mirrors and spherical mirrors. Flat mirrors are used for applications that deflect light as accurately as possible, especially for optical experiments. Concave mirrors as spherical mirrors are used to focus light at one point. The high reflection effect and other properties of optical mirrors depend on the wavelength, angle of incidence and polarization of light. Optical reflectors can be used in astronomy, metrology, aerospace and other optical systems, such as large space telescopes, large ground telescopes, early warning satellites, reconnaissance satellites, meteorological satellites, high-energy lasers, lidar systems, X-ray and vacuum ultraviolet telescopes, high resolution camera and other applications. CLZ Precision Optics Co., Ltd. can customize and produce broadband dielectric mirrors, metallic mirrors and concave mirrors according to your applications. At the same time, we also coat customized optical mirrors according to your requirements.
2. What kinds of optical mirrors can be divided? What are the characteristics and applications of various reflectors?
Optical mirrors sorted out according to kinds of optical coatings.
Broadband dielectric mirrors
Broadband dielectric mirror have high reflectivity in a certain wavelength range. The high reflection coating is deposited by a coating of non-metallic materials with different refractive indexes. It can be used at 0 ° and 45 ° incidence angles. Compared with metal mirrors, broadband dielectric mirrors have higher mechanical properties, harder coatings, high resistance to other working environments such as thermal changes, humidity, salinity. Meanwhile, broadband dielectric mirrors are easy to clean and have higher laser damage threshold, low absorption rate, low scattering. If you need a mirror with a low expansion coefficient and high wear resistance, as a manufacture of optical mirrors, we recommend that use fused silica as optical substrate. Broadband dielectric mirrors can be used in multi wavelength, high-energy laser systems and lighting equipment.
The metal coatings of common metal mirrors are gold, silver and aluminum. The reflectivity of metal mirrors varies about 96%. Compared with broadband dielectric mirrors, metal mirrors provide higher bandwidth and are insensitive to wavelength, polarization, and angle of incidence. However, there is a clear difference between the adhesion of different metal films and optical substrates. The chemical stability of metallic coating is poor. It is susceptible to environmental impact. The film is soft and easy to wear, commonly using magnesium fluoride and other coatings as a protective layer. The reflectivity of metallic mirrors after coating should be relatively lower. Metal mirrors can be used as laser scanning mirrors for sensors, medical mirrors, car rearview mirrors, low-power laser systems, optical instruments and other applications.
Gold mirrors are suitable for the infrared wavelength range. The ideal working wavelength range is 750-1500nm. The reflectivity can reach 99% in the infrared spectral range. It is the preferred coating for infrared applications, especially in infrared applications with wavelengths greater than 2 microns. The thermal conductivity of silicon is much higher than that of optical glass. So when silicon wafers are coated, gold film is the first choice. Gold has stable chemical properties and strong corrosion resistance. It is less affected by the environment. It can be used without coating. However, due to the soft texture of gold, we recommend that coat it for easily maintaining and cleaning.
Silver mirrors are suitable for visible and infrared ranges. The reflectivity of silver mirrors can reach 99% in the visible and infrared ranges, while it can be less than 90% in the ultraviolet range. The chemical nature of silver is relatively lively. It is susceptible to oxidation reactions and tarnishing due to environmental influences. Therefore, we recommend that use protective films to enhance its mechanical properties.
Aluminum mirrors are economical and durable among optical mirrors. The reflectivity of the aluminum film in the entire spectral range is greater than 85%. It can reach 92% in the visible light range. In the ultraviolet range, aluminum is the most reflective metal. Aluminum is a lively metal. It is easy to form an anti-corrosion oxide film and evaporate. It has a low melting point. In order to enhance the mechanical performance of aluminum mirrors, a protective film can be coated on the surface of aluminum mirrors.
Optical mirrors sorted out according to geometrical shapes.
Plane mirrors are mirrors with a flat reflection surface. If an optical system can form a perfect image with random wide beam in any large space, namely, any concentric beam can still be kept as a concentric beam after passing through the system, then this system is an ideal optical system. Flat mirrors do not change the concentric nature of the light beam. They can improve the formation of the image, so flat mirrors are indispensable in an ideal optical system. Planar mirrors are suitable for interferometers, imaging systems, laser applications, collimators and other optical systems.
Concave mirrors(Convergent mirrors, Curved mirrors)
Concave mirrors are optical mirrors that bend inwards to focus light toward the inner focal point. When the parallel light shines on concave mirrors. It reflects on the focal point in front of the mirror through its reflection. The reflective surface is the concave surface. The focus is in front of optical mirrors. When the light source is in focus, the emitted light forms a parallel beam after being reflected. The imaging effect is also different, when the distance between the concave mirror and the object is different. Concave mirrors and optical lenses have many similar optical properties, especially in optical information processing, which can play an equivalent role. Concave mirrors are widely used in daily life, such as microscopes, astronomical telescopes, dentist mirrors, imaging systems, laser systems and other applications.
Aspherical mirrors(off-axis mirrors)
Off-axis parabolic mirrors are finite conjugate focusing mirrors that image at a set angle. They have fixed conjugate images and path length of the object. The light passing through a aspherical mirror can be parallel to the optical axis of the parallel light, completely converging to the focal point. The spherical aberration is zero by this time. Off-axis mirrors can ensure high resolution in the design of compact systems. They are a key element in spectrometers and astronomical optical instruments. Aspheric mirrors can be used in telescopes, astronomical telescopes and infrared spectroscopy systems.
What kind of optical mirrors provide we for you?
Plano mirrors, the shapes of them are circular, elliptic, square, rectangular and other shapes of custom optical mirrors according to your drawings.
Spherical mirrors, we provide custom concave mirrors that meet the requirements of your applications.
Various optical mirrors, we provide custom optical mirrors with dielectric coatings and metallic coatings, including gold coating, silver coating and aluminum coating and other custom optical coatings.
How to choose the right optical mirrors?
As a manufacturer of optical mirrors, we recommend that firstly choose the right material and coating material according to the environment of optical mirrors and consider whether the adhesion between optical material and coating material is feasible. For example, the adhesion of gold and silver to optical glass is slightly worse than that of aluminum to optical glass. When selecting the coating layer, the main considerations are the reflectivity, laser damage threshold and mechanical properties (whether it is resistant to wear) of the film layer in different wavebands. Determine whether to use a flat mirror or a concave mirror according to the purpose of optical mirrors. In addition, the optical power or energy density on the mirror surface, polarization sensitivity, substrate flatness, and other related physical parameters need to be considered. CLZ Precision Optics Co., Ltd. can not only provide you with custom optical mirrors that meet your applications, but also provide you with high-value suggestions based on years of production and supply experience. Welcome to consult.
3. What kind of optical mirror can we produce?
N-BK7、Fused Silica、BOROFLOAT、Silicon and other optical materials according to your requirements.
4. Which kind of Metrology Equipment do we use?
v Zygo® Verifire Interferometer - 4",
v Perkin Elmer Lambda 900 UV/VIS/NIR Spectrometer
v Opticentric Centering Machines
v Edmund Optics Scratch-Dig Sets
v Spherometers , Calipers, Dial Indicators accurately measure small distances and angles and are used for dimensional measurements of optics.
5. Why are we your best choice?
CLZ Precision Optics Co., Ltd. always upholds the spirit of innovation and scientific attitude. We constantly improve the methods and equipment for producing optical components. Our team has extensive production experiences. The four founders have worked and studied at the famous Singapore optical company Qioptiq. Over the years, our company has provided many domestic and foreign customers with custom spherical lenses, optical domes, optical windows, optical mirrors, optical prisms and other optical components. According to the requirements of clients, we use various optical materials required to produce coated or non-coated optical components to meet the application needs of customers. Our testing standards and quality assurance have won the trust of customers and established good relations with continuous follow-up cooperation. We always value the quality of each batch of optical components and value the trust of clients every time. Quality creates value, which is our business development philosophy.