Fused Silica Wafers UV, JGS1, JGS2, JGS3 Grades

University Wafer Silicon Wafers and Semicondcutor Substrates Services
University Silicon Wafer for Production

Large Selection of Fused Silica Wafers

Below are just some of the fused silica wafers that we have in stock. We have smaller and larger dimaeters with very thick and very thin availble. Please ask us about our deposition services.

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What other Fused Silica Specs do Researchers Ask For?

Researcher:

I was looking for 10 -20 diced fused silica samples 20 mm x 20 mm with a thickness of 1 mm.

We Quoted:

Diameter: 20 x 20mm
Thickness: 1+/-0.025mm
Surface: Double Side Polished
Grade: JGS1
OH Content: <1,200ppm
Warp: <30um
Bow: <30um
TTV: <10um
Roughness: <1nm
Scratch/Dig: 60/40

Can you make 49x49x1mm fused silica wafer?

We Quoted
49x49x1mm, DSP
1 Corner chamfered
UV Grade(JGS1) and Standard Grade (JGS2)

What Fused Silica Substrates Are Used to Make FS Mirror?

Fused Silica Mirrors -coated with metallic mineral on one side of the wafer.

Fused Silica Wafer UV Grade(JGS1)
2 inch diameter and (2 mm and 2.5 mm thicknesses)
Optical specifications:
Surface Flatness: wave/4 (PV) @633 nm
Surface irregularities < 5 nm
Scach-dig: 60/40

Gold Coated Fused Silica

We can deposit gold onto fused silica wafers. Recently a research client asks the following:

The material of wafer: Fused Silica
Thickness: 100um
Diameter: 50.8mm
DSP

In addition, I want a partial coating on those thin wafer.

Metalization: Gold (Au)
Mask: Diameter: 0.5...1.5 mm circular area (blue) coated with gold and with 3.3mm pitch between coated areas.

Au coated fused silica


Please ignore those black circles and the drawing is not a true scale. I would update it.

fused silica circles

Fused Silica Flexible Electronics Applications

Researchers have used the following fused silica JGS2 wafer for their flexible electronics research. Reference ONL29661.

Item #518

100mm 500um DSP 60/40 Scratch/Dig

What is Fused Silica JGS2 UV transmission Rate?

A researcher asked:

I noticed on the website that there are 5 types of 4inch wafer options for JGS2 optical grade fused silica wafers varied by their thickness. Usually thicker wafers would have a lower UV transmission rate, but they're all labeled as JGS2. may I ask if they have exactly the same UV transmission rate here? If not, what's their own specifications?

UniversityWafer Replies:

Firstly, JGS2 is not UV transmitted. It works on the Visible and infrared wavelengths. It's transmittance reaches its peak at 270nm wavelength. The one that is UV transmitted is JGS1.

Secondly, it's true when the material gets thicker, the UV transmittance decreases. However, we are not equipped with the intrusment that can detect the transmission rates for different thicknesses.

What we can get is the officially released material specifications. In that, it does not specify the UV transmission rate for various thicknesses.

Finally, according to our knowledge on other materials, such as Borofloat 33, transmission rate does not decrease so drastically when the wavelength is short.

The Researcher Replies

Thanks a lot, I really appreciate that. So here're my questions:

1. The UV wavelength we will be using is 352nm, in UV-A range (315-400nm). We do not need the wafer to be transparent for UV-B (280-315nm) or UV-C(100-280nm) range. I could be misinformed, but I checked that for JGS1, JGS2 and JGS3, the UV transmission rates for wavelength 300~400nm are all >90%. Will JGS2 and 3 be enough for our application (UV wavelength 352 nm)? If not, are there any JGS1 in stock and could be customized?

2. As you mentioned in the previous email, borofloat 33 could maintain a stable UV transmission rate no matter what thickness it is. Can I ask what's the UV transmission rate for this type of material you mentioned? If it's possible, can we also get a quote for it?

What we want are optically transparent wafers that could reach at least 90% UV transmission rate for 352 nm UV-A wavelength. The thickness of the wafer isn't our priority to consider, but it would be prefered if the wafer is thicker (in case it breaks during assembly). If you could provide us any other alternative materials, that would be really appreciated too!

Thank you so much for your time, let me know if you have any questions or further information I need to provide. Looking forward to hearing from you!

As client will be using UV-B (280-315nm) only and specifically at 352nm, JGS2 is more than enough for this range. As its transmittance curve shows, transmission rate of JGS2 reaches 90% at 270nm. And of course JGS1 is also workable at this range, but more expensive. So, I think JGS2 may serve the client well.

The reason why I mention BF33 is not because it is UV transmitted. BF33 does not work on the UV range. Why I mention it is actually because this is the only brand/grade I found with an official transmittance curve depicting transmission rates at different thicknesses. However, the theory holds as the shorter the wavelength, the higher the energy of the light/wave, and thus the better the transmittance. To be clearer, glass thickness has a smaller influence on the UV range than on the visible range than on the IR range.

singleron bio wafer design

We quoted you several JGS2 spec's with 100mm diameter and different thicknesses this year, you may suggest one that the client finds suitable.

Fused Silica Grade JGS1, JGS2, JGS3

We have all three grade in stock for your respective research

Please email us your specs or buy online here!

Diameter

Thick (um)

Polish

50.8mm 500um DSP

JGS2 Fused Silica Top side Ra <1nm, Backside Roughness Ra <1nm, S/D 40/20

50.8mm 100um DSP
76.2mm 500um DSP

1 Flat JGS2 Primary Flat 32.5+/-2mm, Top Side Ra <10A, S/D 40/20

100mm 500um DSP

Mechanical Grade Fused Silica

100mm 500 um DSP
100mm 1000um DSP

Fused Silica JGS2 Warp <30um Bow <30um, TTV <10um, Top side Ra <1.0nm Backside Ra <1.0nm, S/D 60/40 Flat: 32.5+/-2mm

100mm 700um DSP
100mm 180um DSP

Fused Silica Wafer, JGS2, C Bevel, 2.50 mm +/- 0.10 mm

100mm 2500um DSP

Fused Silica Substrates to Evaluate The Thermal Expansion and Fluorescence/Auto-Fluorescence Properties

A research client asked:

Question 1: Looking for 150mm (6”) LiNbO3 substrates, 500um thick, 128 degree Y-cut, SAW grade, DSP Double Side Polished, Notched (SEMI standard notch), Serialized (Need serialized) also since these are delicate, do you offer them on glass? Minimum order quantity and would be ramping up to Volume quantities of: 200, 800, 1500, and 3000 wafers Question 2: 150mm (6") Quartz wafers, DSP, 635um SEMI Notch, Serialized (or what other thicknesses available) (Single Crystal X-Cut) Looking for this in any or all of these materials – Quartz, Fused quartz, Fused Silica We specifically are evaluating the Thermal Expansion and Fluorescence/ auto-fluorescence properties. Minimum quantity, lead time.  

UniversityWafer, Inc. Reply

 Diameter Material  Orientation  Thickness Surface Finish  Primary Flat Brand/Grade Warp Bow TTV Top side Ra Backside Ra Remark 
150+/-0.3mm LiNbO3 128Y-cut 0.5+/-0.03mm DSP NOTCH or 47.5+/-2.5mm on+Z SAW <40um <40um <10um <1nm <1nm JAR
Diameter Brand/Grade Thickness Surface Finish  Primary Flat Material  Bow TTV Top side Ra Backside Ra package shipment term pay term 
150+/-0.3mm JGS2 635+/-25um DSP 47.5+/-1.5mm Fused quartz <40um <10um <1nm <1nm Jar ex-work T/T AD
150+/-0.3mm JGS1 635+/-25um DSP 47.5+/-1.5mm Fused Silica <40um <10um <1nm <1nm Jar ex-work T/T AD
Diameter Material  Orientation  Thickness Surface Finish  Primary Flat Brand/Grade SEED Top side Ra Backside Ra shipment term    
150+/-0.5mm Quartz Crystal X-cut 0.635+/-0.05mm DSP 57.5+/-2.5mm SAW withseed <1nm <1nm ex-work    

What is the Difference Between Fused Silica and Fused Quartz?

This is a large concept, there are many different materials for fused quartz and Fused Silica .
Fused Quartz is defined as a material made by melting high purity, naturally occurring quartz crystal. The melting is conducted at around 2000°C, using either an electrically heated furnace (electrically fused) or a gas/oxygen fueled furnace (flame fused). Fused quartz is amorphous and non-crystalline.

Residual impurities from the raw material affect Fused Quartz transparency in the ultraviolet. Such as JGS2,

Fused Silica (also known as Synthetic Fused Silica) is made from a silicon-rich chemical precursor, usually using a continuous flame hydrolysis process, which involves chemical gasification of silicon, oxidation of this gas to silicon dioxide, and thermal fusion of the resulting dust (although there are alternative processes).
This results in a transparent glass with an ultra-high purity and improved optical transmission in the deep ultraviolet. Water vapor, generated as a byproduct during the fabrication process,
affects the transparency of fused silica in the infrared. Such as Corning 7979, 7980 JGS1, JGS3 etc

How do You Serialize Fused Silica Windows

We can laser mark our Fused Silica, Fused Quartz and Lithium Niobate (LiNbO3) Substrates

Corning 7979 Fused Silica Wafers for Infrared (IR) Applications

The following windows have been used for researchers infrared research.

 

quote no.

Dia

Thick

Pol

Brand /Grade

Top side Ra

Backside Ra

U01-W1-T-200812-1 100 +/-0.2mm 0.5+/- 0.05mm DSP Corning 7979 <0.5nm <0.5nm
U01-W1-T-200812-2 100 +/-0.2mm 0.5+/- 0.05mm DSP Corning 7978 <0.5nm <0.5nm

7979 and C7978 as they both have IR range. You can find the transmittance curve and our quotes below:

corning 7979 fused silica for infrared