Application: Lighting, Medical, Optical, Photography. Model: RAY-XS256#.
Overview
Fused Silica Nbk-7/Optical Glass/Laser Damage Resistant Glass/Laser Lens/Zerodur Zero Expansion Glass Ceramic: an optical lens in Optical Glass (N-Bk7 Optical Glass substrate). Listed geometry: single-lens shape. Optical / electrical data: transmittance >95%. Temperature 557celsuis Degrees. It is used in Lighting, Medical, Optical and Photography. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.
Specifications
| Material | Optical Glass |
|---|---|
| Substrate | N-Bk7 Optical Glass |
| Shape | Single-lens |
| Transmittance | >95% |
| Usage | Lighting, Medical, Optical, Photography |
| Model NO. | RAY-XS256# |
| Lenses Color | Clear |
| Cte | 7.1*10-6/K (-30 Celsuis Degree to +70celsuis Degr) |
| Annealing Point | 719celsuis Degrees |
| Transformation Temperature Tg | 557celsuis Degrees |
| Abrasion AA | Ve = 63, 96 Vd = 64, 17 |
| Coefficient of Expansion | 7,1 x10-6/K (-30 °C to +70 °C) |
| Softening Point (107,6 dPa) | 719 °C |
| Annealing Point (1013 dPa) | 557 °C |
| Thermal conductivity | 1,114 W/(m x K) |
| Specific heat capacity | 0,858 J/(g x K)(20 °C ; 100°C) |
| Applying Fields | Typical Applications |
| Supplier | Shanghai Rui Tai Photoelectric Technology Co., Ltd. |
Technical data
| Thermal Properties | |
|---|---|
| Item | Value |
| Coefficient of Expansion: | 7,1 x10-6/K (-30 °C to +70 °C) |
| 8,3 x10-6/K (+20 °C to +300 °C) | |
| Viscosities: | |
| Softening Point (107,6 dPa): | 719 °C |
| Annealing Point (1013 dPa): | 557 °C |
| Transformation temperature Tg: | 557 °C |
| Thermal conductivity: | 1,114 W/(m x K) |
| Specific heat capacity: | 0,858 J/(g x K)(20 °C ; 100°C) |
| Mechanical Properties | ||
| Item | Unit | Value |
| Density | g/cm3 | 2.51 |
| Yong's Module E | GPa | 82 x 103 N/mm2 |
| Poisson's ratio μ | 0,206 | |
| Compression strength | GPa | – |
| Bending strength | MPa | – |
| Tensile strength | MPa | – |
| Torsional rigidity | GPa | – |
| Vickers hardness | GPa | — |
| Knoop HardnessHK 0,1/20 (ISO9385) | – | 610 |
| Abrasion Aa* | – | ve= 63,96vd = 64,17 |
| Refractive index nd | – | – |
| Softening point | ºC | – |
| Annealing point | ºC | – |
| Strain point | ºC | – |
| Specific heat(26ºC) | kJ/kgK | – |
| Thermal conductivity ratio(26ºC) | cal/cm.sec.ºC | – |
| Thermal conductivity ratio(100ºC) | Cal/cm.sec.ºC | – |
| Refractive Index name | Wavelength (nm) | Refractive Index |
| ni | 365,0 | 1.53627 |
| nh | 404,7 | 1,53024 |
| ng | 435,8 | 1,52668 |
| nF' | 480,0 | 1,52283 |
| nF | 486,1 | 1,52238 |
| ne | 546,1 | 1,51872 |
| nd | 587,6 | 1,51680 |
| nD | 589,3 | 1,51673 |
| n632,8 | 632,8 | 1,51509 |
| nC | 643,8 | 1,51472 |
| nc | 656,3 | 1,51432 |
| nr | 706,5 | 1,51289 |
| ns | 852,1 | 1,50980 |
| nt | 1014,0 | 1,50731 |
| Main Applying Fields | |
|---|---|
| **** |
What to specify when you request a quote
- Material — listed as “Optical Glass”; name the glass or crystal.
- Geometry — give diameter, focal length or radii, angles and tolerances.
- Surface figure — quote surface figure (λ) and scratch-dig.
- Centring and edges — state centration and edge chamfer.
- Coating — list the band and reflectance or transmission target.
Engineering guides for this part
For material grades and coating options, see Fused Silica Windows for UV and Laser Optical Systems. How parts like this are machined and finished is covered in Flat Glass Polishing Process for Precision Substrates. For an application example, read How to Handle and Maintain Precision Glass Components in Laser Systems. Before sending a drawing, check Fused Silica Refractive Index: Key to Optical Design Improvement. A related standard product is Laser Beam Splitter Glass Sheet.
