Dome lenses are hemispheres. The two optical surfaces are an equal thickness apart, creating a naturally strong shape that gets tougher under pressure. This makes dome windows ideal for underwater environments and in applications such as camera dome ports and submersible windows.
Sapphire domes: For infrared applications we can provide sapphire domes. Sapphire is an extremely hard material with transmission of over 80% in the 2-5µm wavelength range. As with fused silica, sapphire is able to withstand extreme pressures, making it the perfect material for underwater camera and missile fairing applications.
Specifiation of our dome lens as follow: Hk9 Glass Dome Lens,Hk9 Hemisphere Domes Lens,Hemispheric Glass Dome Lens,Optical K9 Glass Dome Lens China Star Optics Technology Co.,Ltd. , https://www.csoptlens.com
The advanced collectives commended this time, under the great attention of leaders at all levels, have a sound organizational system, and the first-line scientific and technological personnel of the enterprise are brave in innovation and the achievements of mass technological innovation activities are outstanding. It has played an important role in promoting the integration of innovation elements into enterprises, improving technological innovation capabilities, cultivating innovative scientific and technological talents, improving the scientific quality of employees, popularizing scientific and technological knowledge, promoting innovation culture and building innovative countries. (According to the new big new material) 
BK7 or K9L domes are used primarily in meteorology applications. BK7 offers excellent transmission from 300nm up to 2µm. BK7 is a relatively hard material, with excellent chemical durability.
UV fused silica domes ( JGS1 ): For applications operating in the deeper UV range, we offers a range of UV fused silica domes. Fused silica domes are commonly used in underwater applications at extremely high pressures.
Material:Optical glass N-BK7 , H-K9L, UV Fused Silica, Sapphire, and infrared crystal materials.
Diameter:20-350mm
Diameter Tolerance:+/-0.1mm
Thickness:>2mm
Thickness Tolerance±0.2~0.1mm
Center Deviation:3-5'
Surface quality:80/50 60/40
Coating: Antireflection Coating inside or both sides
Chamfers:0.2 x 45° typical
Abstract In order to further promote the in-depth development of “speaking ideals and contributing†activities, create a good atmosphere for mass technological innovation activities, serve innovation to drive development strategies, vigorously improve independent innovation capabilities, and accelerate the transformation of economic development mode; China...
To further promote the in-depth development of “speaking ideals and contributing†activities, create a good atmosphere for mass technological innovation activities, serve innovation to drive development strategies, vigorously improve independent innovation capabilities, and accelerate the transformation of economic development mode; China Association for Science and Technology, development and reform The Commission, the Ministry of Science and Technology, the State-owned Assets Supervision and Administration Commission, and the National Federation of Trade Unions have decided to make outstanding contributions to the activities of “speaking ideals and contributing†in 2013-2014, and awarded Henan Xinda New Materials Co., Ltd. and other enterprises with strong demonstration functions. "National" speaks of ideals and is more honorary than the contribution of 'Advanced Collectives of Activities'.