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High Precision Thin N-BK7, UV Fused Silica Windows

  • Off-the-shelf and custom modules available
  • Made of BK7, UVFS, or Quartz Crystals
  • Minute thickness and high surface flatness
  • Surface quality 10/5 and parallelism 10”
  • Minimum thickness: 0.03mm, minimum size: 0.5mm
  • Uncoated mirror substrates and custom AR coating options available
Inquire for custom product  
Code Material Diameter Thickness Surface Quality Flatness Parallelism Coating Unit Price Delivery Cart
135-001 N-BK7 12.7mm 0.2mm 10/5 S/D λ/2 10 arcsec Uncoated $30.0 2 weeks
135-002 N-BK7 12.7mm 1.0mm 10/5 S/D λ/10 10 arcsec Uncoated $30.0 2 weeks
135-003 N-BK7 25.4mm 0.2mm 10/5 S/D λ/2 10 arcsec Uncoated $45.0 2 weeks
135-004 N-BK7 25.4mm 1.0mm 10/5 S/D λ/10 10 arcsec Uncoated $45.0 2 weeks
135-005 C7980-0F 12.7mm 0.2mm 10/5 S/D λ/2 10 arcsec Uncoated $38.0 2 weeks
135-006 C7980-0F 12.7mm 1.0mm 10/5 S/D λ/10 10 arcsec Uncoated $38.0 2 weeks
135-007 C7980-0F 25.4mm 0.2mm 10/5 S/D λ/2 10 arcsec Uncoated $60.0 2 weeks
135-008 C7980-0F 25.4mm 1.0mm 10/5 S/D λ/10 10 arcsec Uncoated $60.0 2 weeks
135-009 C7980-0F 25.4mm 1.0mm 10/5 S/D λ/10 10 arcsec 400-700nm AR Coating $75.0 2 weeks

Hangzhou Shalom EO has successfully developed a double surface polishing method for the production of High Precision Thin Optical Windows or Substrates, where the surfaces of the windows or substrates are polished in one go, achieving accurate control of surface flatness while elevating the surface quality to 10/5 S/D. The high precision thin windows manufactured in our factory are of outstanding functionalities that could meet the requirements for ultra-thin (typically 0.1mm, 0.2mm) windows or substrates with high surface flatness (Lambda/10 or Lambda/4 @633nm),  oriented for applications for precision optical systems such as Femto-line laser systems, whose market is growing rapidly in recent years, 

The double surface polishing method is a processing technique, where both of the two surfaces of optics complete their polishing procedure in one go. The optics are not put on pitch plates during the procedure, so that is no stress-releasing problem caused by bonding and detachment between the optics being polished and the carrier plate, which effectively eliminates the variation of surface flatness of the window substrate. High Precision Thin windows made from BK7, UV Fused Silica, and Quartz Crystals are available in Shalom EO, the windows feature superior surface quality of 10/5 Scratch/Dig, the parallelism of 10 arc sec, with minimum thickness down to 0.03mm, diameter down to 0.5mm. N-BK7 are appropriate for applications from Visible to IR spectrum (350-2000nm), and UV Fused Silica possesses extremely low absorption in the UV range. Both of them are optical glass materials with substantial mechanical strength and thermal stability and could endure operations under various conditions. Besides, windows made from Quartz Crystal are also provided.

The standard specifications of Thin BK7, UVFS, and Quartz Crystals Windows offered in Shalom EO include 12.7mmx0.2mm with λ/2 flatness, 12.7mmx1.0mm with λ/10 flatness, 25.4mmx0.2mm with λ/2 flatness and 25.4mmx1.0mm with λ/10 flatness, in addition to other custom dimensions. The windows could be configured with mounts for ease of handling, both uncoated window substrates and custom AR coatings are available.

Interference Test Result (Measured by Zygo)

Femto-line laser systems are developing rapidly in recent years, subsequently, one of its most crucial components, the demand for Ultra-thin (typically 0.1mm, 0.2mm) windows or substrates with high surface flatness (Lambda/10 or Lambda/4 @633nm) are surging.

The classical single surface polishing method, though utilized conventionally and commonly in the production of high precision laser grade optics products,  practical implementation has proved its difficulty and unreliability while processing high flatness optics with miniature thickness. The reason is that, during the actual operation of classical single surface polishing, the polished optics are often put on pitch plate to accomplish the polishing procedure, the pitch plate and the optic are often bonded, inducing stress to the optics. You might manage to attain high surface quality(surface flatness and surface scratch/dig) while the optic is on the pitch plate, but once the optic is detached, the stress that comes from bonding is naturally released, leading to a slight change of the form of the optics, and the surface flatness will be eventually lowered. The thinner the optics, the more severe the impact of stress-releasing, since even the mildest deviation of the surface flatness could be significant as a proportion of the total thickness. To achieve high surface flatness in ultra-thin windows is always challenging for manufacturers.

To deal with the problem, Hangzhou Shalom EO has successfully developed a double surface polishing method for processing high precision optical windows or substrates, where both of the two surfaces of optics complete their polishing procedure in one go. The optics are not put on pitch plates during the procedure, so there is no stress releasing problem, which effectively eliminates the variation of surface flatness after it is taken off the pitch plates. The double surface polishing method is not incorporated in precise optics fabrication previously because the finished optics produced by this method have the defect of low surface quality (that is, relatively higher S/D). Hangzhou Shalom EO has done overcame this obstacle by improving the polishing machine, successfully raising the surface quality to 10/5 S/D, while exploiting the benefits of the double surface polishing method of precise surface flatness. Furthermore, excellent parallelism(10 arc sec) is also realized on the UVFS Ultra-thin Windows or Substrates.

N-BK7 λ/10 D12.7x1.0mm Uncoated Windows

N-BK7 λ/10 D12.7x1.0mm Uncoated Windows

C7980-0F λ/10 D12.7x1.0mm Uncoated Windows

C7980-0F λ/10 D12.7x1.0mm Uncoated Windows

N-BK7 λ/10 D25.4x1.0mm Uncoated Windows

N-BK7 λ/10 D25.4x1.0mm Uncoated Windows