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融石英

融石英由硅和氧的化学结合形成。 熔融石英是一种完美的光学材料,因为它具有良好的紫外和红外透射率,低热膨胀系数。 它具有高稳定性,耐大温度偏移,宽温度工作范围和高激光损伤阈值的热冲击。
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  • 描述
Fused Silica is formed by chemical combination of silicon and oxygen. Fused Silica is perfect optical material due to its good UV and IR transmission, low coefficient of thermal expansion. It has high stability and resistance to thermal shock over large temperature excursions, wide temperature operating range and high laser damage threshold.
 
Properties
Density 2.20g/cm3
Abbe Constant 67.6
Refractive Index (nd) at 588nm 1.4586
Wavelength
(um)
Refractive
 Index (n)
Wavelength
(um)
Refractive
Index (n)
0.2 1.55051 1 1.45042
0.22 1.52845 1.064 1.44962
0.25 1.50745 1.1 1.4492
0.3 1.48779 1.2 1.44805
0.32 1.48274 1.3 1.44692
0.36 1.47529 1.5 1.44462
0.4 1.47012 1.6 1.44342
0.45 1.46557 1.7 1.44217
0.488 1.46302 1.8 1.44087
0.5 1.46233 1.9 1.43951
0.55 1.46008 2 1.43809
0.588 1.4586 2.2 1.43501
0.6 1.45804 2.4 1.43163
0.633 1.45702 2.6 1.42789
0.65 1.45653 2.8 1.42377
0.7 1.45529 3 1.41925
0.75 1.45424 3.2 1.41427
0.8 1.45332 3.37 1.4099
0.85 1.4525 3.507 1.40566
0.9 1.45175 3.707 1.39936
 

There are different types Fused Silica according the different application. In China, there are mainly three types, i.e. JGS1, JGS2, JGS3.Below are the application and their equivalent to other Fused Silica supplier.


JGS1


UV grade Fused Silica: (JGS1) is synthetic amorphous silicon dioxide of extremely high purity. This non-crystalline, colorless silica glass combines a very low thermal expansion coefficient with good optical qualities, and excellent transmittance in thf orientation and temperature instability inherent in the crystalline form. Fused silica is used for both transmissive at ultraviolet. Transmission and homogeneity exceed those of crystalline quartz without the problems on reflective optics, especially where high laser damage threshold is required. JGS1 is transparent in the ultraviolet and visible regions, and has no absorption bands in the 170-250 nm wavelength intervals. It has an intensive OH absorption band in the interval of wavelength 2600-2800 nm.  


JGS1 is used for optics operating in the deep UV and the visible wavelength range (Laser Lenses, Windows, Prisms, Mirrors, etc.). It is practically free of bubbles and inclusions.



JGS2


Optical Grade Fused Quartz (JGS2) provides good UV and visible transmission. It has almost the same physical and chemical properties with JGS1. However only in thin & small sheet pieces, JGS2 is virtually bubble-free. Elements built from larger pieces will most likely contain bubbles, so application should not be sensitive to these inclusions. But in cases where simple light gathering and strong mechanical properties are the primary goals, JGS2 grade provides excellent performance at a low price.  Ideal Applications for JGS2:  


● Condenser optics not concerned with scatter or distortion
● High temperature and pressure applications
● Optical flats, microscope slides and sight glasses


JGS3


JGS3:equivalent to Suprasil 300 (Heraeus). JGS3 is transparent in the ultraviolet, visible and infrared spectral regions, without considerable absorption bands in the 185-250 nm spectral region.

 

Hardness 5.5 - 6.5 Mohs Scale 570 KHN 100 
Design Tensile Strength 4.8x107 Pa (N/mm2) (7000 psi) 
Design Compressive Strength Greater than 1.1x109 Pa (160,000 psi) 
Bulk Modulus 3.7x1010 Pa (5.3x106 psi) 
Rigidity Modulus 3.1x1010 Pa (4.5x106 psi) 
Youngs Modulus 7.2x10-10 Pa (10.5x106 psi) 
Poissons Ratio 0.17 
Coefficient of Thermal Expansion 5.5x10-7cm/cm.°C (20°C-320°C) 
Thermal Conductivity 1.4 W/m.°C 
Specific Heat 670 J/kg.°C 
Softening Point 1683°C 
Annealing Point 1215°C 
Strain Point 1120°C 
Electrical Receptivity 7x107 ohm.cm (350°C) 
Dielectric Properties (20°C and 1 MHz)
Constant 3.75
Strength 5x107 V/m
Loss Factor Less than 4x10-4
Dissipation Factor Less than 1x10-4 
Velocity of Sound-Shear Wave 3.75x103 m/s 
Velocity of Sound/Compression Wave 5.90x103 m/s 
Sonic Attenuation Less than 11 db/m MHz 
Permeability Constants (cm3mm/cm2 sec cm of Hg) (700°C)
Helium 210x10-10
Hydrogen 21x10-10
Deuterium 17x10-10
Neon 9.5x10-17
Chemical Stability (except hydrofluoric) High resistance to water and acids 


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光学玻璃可以改变光的方向,以及紫外光,可见光或红外光的相对光谱分布。光学玻璃材料是最常见的类型,因为它具有优异的光学性能,如高透光性和环境稳定性。
Colored Glass Substrates
有色玻璃(截至型,选择吸收型,中性密度型)

UNI Optics供应材料包括中性密度,短程,长通,带通,紫外线,红外线,吸热和色温转换滤光片。

IR Optics material
红外材料

1.  Germanium (Ge)


Germanium (Ge) is the preferred lens and window material for high performance infrared imaging systems in the 8–12 μm wavelength band. Its high refractive index makes Ge ideal for low power imaging systems because of minimum surface curvature. Chromatic aberration is small, often eliminating the need for correction.

 

Crystallographic properties
Syngony Cubic
Crystal Form Poly or Single Crystal
Lattice Constant 5.66
Cleavability <111>, non-perfect
Molecular Weight 72.6
Physical properties
Density, at 20 °C 5.33
Hardness, Mohs 6.3
Dielectric Constant for 9.37 × 109 Hz at 300 K 16.6
Melting 937
Thermal Conductivity, W/m·K at at 293 K 59
Thermal Expansion, 1/K at 298 K 6.1 × 10-6
Specific Heat Capacity, J/(kgK) at 273-373 K 0.074
Bandgap, eV 0.67
Knoop Hardness, kg/mm2 800
Youngs Modulus, Gpa 102.66
Shear Modulus, GPa 67.04
Bulk Modulus, GPa 77.86
Debye Temperature, K 370
Poissons Ratio 0.278
Elastic Coefficient C11=129, C12=48.3, C44=67.1
Apparent Elastic Limit 89.6 MPa (13000psi)
Chemical properties
Solubility in water None
Solubility in acids Soluble
Molecular Weight 72.59

2. Silicon (Si) 


Silicon (Si) is grown by Czochralski pulling techniques (CZ) and contains some oxygen that causes an absorption band at 9 microns.To avoid this, material can be prepared by a Float-Zone (FZ) process. Optical silicon is generally lightly doped (5 to 40 ohm cm) for best transmission above 10 microns, and doping is usually boron (P-type) and phosphorus (N-type). After doping silicon has a further pass band: 30 to 100 microns which is effective only in very high resistivity uncompensated material.
 
CZ Silicon is commonly used as substrate material for infrared reflectors and windows in the 1.5-8 micron region. The strong absorption band at 9 microns makes it unsuitable for CO2 laser transmission applications, but it is frequently used for laser mirrors because of its high thermal conductivity and low density. Application as window, lens in the 1.5 - 8 um region; Mirror for CO2 laser and spectrometer applications.
 

Crystallographic properties
Syngony Cubic
Lattice Constant, A 5.43
Physical properties
Density 2.33g/cm3
Hardness, Mohs 7
Dielectric Constant for 9.37 x 109 Hz 13
Melting point, оС 1414
Thermal Conductivity, W/m·K at 313 K 163
Thermal Expansion, 1/K at 293 K 2.6x10-6
Specific Heat Capacity, J/(kg°C) 712.8
Bandgap, eV 1.1
Knoop Hardness, kg/mm2 1100
Youngs Modulus, Gpa 130.91
Shear Modulus, GPan 79.92
Bulk Modulus, GPa 101.97
Debye Temperature, K 640
Poissons Ratio 0.28
Chemical properties
Solubility in water None
Molecular Weight 28.09

3、ZnS material:


ZnS MultiSpectral Under intense heat and pressure, defects within the crystalline lattice are virtually eliminated, leaving a water-clear material with minimal scatter and high transmission characteristics from 0.4 to 12 microns. This material is particularly well suited for high-performance common aperture systems that must perform across a broad wavelength spectrum.

Specifications:

Material: ZnS MultiSpectral
Diameter Tolerance: --------------------- +0.0, -0.1mm
Thickness Tolerance: -------------------- ±0.1mm
Clear Aperture: ---------------------------->85%
Parallelism: -----------------------------------3 arc minute
Surface Quality: ----------------------------80-50 scratch and dig
Wavefront Distortion: -------------------- λ /2 per 25mm @633mm
Bevel: -----------------------------------------Protective  (<0.2mm x 45° )
Coating: -------------------------------------- Optional (Uncoated, AR Coating, etc.)


4. ZnSe material


ZnSe is a preferred material for lenses, windows, output couplers and beam expanders for its low absorptivity at infrared wavelengths and its visible transmission. For high-power applications, it’s critical that the material bulk absorption and internal defect structure be carefully controlled, that minimum-damage polishing technology be employed, and the highest quality optical thin-film coatings are used. The material absorption is verified by CO2 laser vacuum calorimetry. Our quality assurance department provides testing and specific optics certification on request.

ZnSe is non-hygroscopic and chemically stable, unless treated with strong acids. It’s safe to use in most industrial field, and laboratory environments.



Laser Crystal
激光晶体

晶体最适用于激光应用。 UNI OPTICS提供以下晶体产品。

1.激光晶体和棒:YAG晶体,Nd:YVO4晶体
2.非线性晶体:BBO,KTP,LiNbO3,LBO。KDP&DKDP
3.双折射晶体:YVO4,a-BBO,方解石。


BK7二向色反射镜
高反二向色反射镜

二向色镜是在两个不同波长下具有显着不同的反射或透射特性的镜子,其特征在于在某些波长下几乎完全透射光并且在其他波长处几乎完全反射光。它可广泛用于激光技术应用。

镀增透膜双凹透镜
可视光/近红外镀膜的双凹透镜

双凹透镜是一种带有两个凹面的负焦距的光学透镜,常用于光束扩展、图像缩小或光投影等应用,也是扩大光学系统焦距的理想选择。优恩立公司可为您提供广泛用途的,带有多种涂层的双凹透镜。

道威棱镜和屋脊棱镜
BK7和熔融石英玻璃道威棱镜

道威棱镜由H.W.多芬发明,多芬棱镜也被称为反转棱镜。当棱镜绕其长轴旋转时,通过棱镜所看到的图像的旋转速度是棱镜旋转速度的两倍。道威棱镜比较特殊,有时用于特殊的应用。入口和出口表面都有防反射涂层

BK7平凸透镜
紫外熔融石英平凸透镜

平凸透镜具有正焦距,可以使光线聚焦到一个点,光准直或利用单色照明聚焦的理想元件,广泛应用于各个行业中优恩立光电提供多种镀膜选择的平凸透镜

熔融石英窗片
高精度紫外熔融石英窗片

熔融石英窗片具有低热膨胀性,在温度大幅改变、宽热工作范围和高激光损伤阈值下具有稳定性和抗热冲击性,,是从紫外到红外传输的更好选择。

融石英楔角棱镜
N-BK7和融石英楔角棱镜

棱镜是一种具有平面倾斜面的光学元件,通常各面以很小的角度相互倾斜,它将光线转向较厚的部分通常可以用作隔离元件。楔角棱镜也可以用来产生一个小偏差,不允许光线返回源。

硒化锌窗口片
红外硒化锌窗口片
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装配的带通滤光片
机器视觉带通滤光片


带通滤光片是一种通过一定范围内的频率并拒绝(衰减)该范围之外频率的装置,它用于选择性地传输一部分光谱,同时拒绝所有其他波长


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