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This is a fused silica JGS2 lightweight blank with diameter of 736mm. The raw material weighs 100KG, after machining, the lightweight blank is about 44.5KG. The back structure is a little bit complicated which makes the good balance of the overall stiffness and the less weight of the whole mirror. MG-Optics can not only provide the customized manufacturing optical mirror blank according to drawings but also the designing for the lightweight structure. The maximum machine diameter is 1500mm.
Product Specification
|
MATERIAL |
Fused silica JGS2 |
Test report |
|
OUTER DIAMETER |
F736mm +/- 1 mm |
CMM test report |
|
THICKNESS |
F126mm 0/+1 mm |
CMM test report |
|
CENTER HOLE |
F56 mm 0/+0.05 mm |
CMM test report |
|
EDGE HOLE |
F11 mm 0/+0.05 mm |
CMM test report |
|
MIRROR RADIUS |
R4177.5mm+/- 50 mm |
CMM test report |
|
TOP SIDE FINISHING |
D20 machined |
DMG Mori 125P |
Material Description
JGS2 fused silica material has been one of the best choices for telescope mirror blank with its cost-effective price and stable optical performance.
|
Mechanical Properties |
Thermal Properties |
||
|
Density |
2.2 g/cm³ |
Strain Point |
1085 ℃ |
|
Compressive Strength |
1100 Mpa |
Softening Point |
1640 ℃ |
|
Bending Strength |
67 Mpa |
Annealing Point |
1190 ℃ |
|
Tensil Strength |
48 Mpa |
Specific Heat（20~350℃） |
670 J/(kg·℃) |
|
Poisson Ratio |
0.14~0.17 |
Thermal Conductivity（20℃） |
1.4 W/(m·℃) |
|
Young's Modulus |
73000 Mpa |
Thermal Expansion Coefficient |
5.5x10¯⁷cm/cm·℃ |
|
Rigidity Modulus |
31000 Mpa |
Hot Working Temperature |
1700~2000 ℃ |
|
Mohs Hardness |
6~7 |
Short Service Temperature |
1300 ℃ |
The SiO2 content of JGS2 is greater than 99.95%, so it is also called pure glass.
The outstanding mechanical, thermal properties and high purity with low density makes JGS2 lightweight blank widely used in large aperture telescope mirrors.
Custom Ordering Information
MG-Optics fused silica lightweight blank includes fused silica JGS1, JGS2, Corning 7980, N-BK7, K9, ULE, Clearceram and other fused quartz materials. MG-Optics can manufacture custom lightweight blank as per your drawings and especially, offer the lightweight structure design.
If you are interested with our products, just send us your drawings or specifications, we will begin preparing a quotation for you.
Contact with our professional technician engineer now!
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Main Product:
optical aspheric mirror,
custom CGH,
optical flat,
optical Mirror blank ,
optical metrology,
optical system
