1. 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
2. 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.）
3. 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.
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UV Fused Silica
Optical Grade Glass
Colored Glass(Cut-off, Absorption,-selective, Neutral color glass)
UNI Optics supply material include neutral density, short pass, long pass, band pass, ultraviolet, infrared,heat absorbing, and color temperature conversion filters. Just point and click on the name above to view information on that manufacturers filters.
UV Fused Silica
Optical Crystals
Crystal are main applied for laser application. UNI OPTICS offers the following crystal products.
1. Laser Crystals and Rods: YAG crystal, Nd: YVO4 Crystal
2. Nonlinear Crystals: BBO, KTP, LiNbO3, LBO. KDP&DKDP
3. Birefringent Crystals: YVO4, a-BBO, Calcite.
M12· Wide Angle Lens UN-UW00292024C-5MP
M12· Fixed-focal Lens UN-UW028022C-2MP
N-BK7 metallic coated mirror
1、What Metallic Coated types can Uni-Optics supply?
Uni-Optics mainly offers four coating types, including:
1) UV Enhanced Aluminum : Ravg > 85% from 250nm to 400nm
2) Protected Aluminum: Ravg > 87% from 400nm to 800nm
3) Protected Silver: Ravg > 95% from 400nm to 20um
4) Protected Gold: Ravg > 98% from 650nm to 16um
2、What are the features of Metallic coated mirror?
Metallic coated mirror have many key features below:
Wide spectral range
Not sensitive to the incidence angle and polarization state
Low cost
Non-durable
Relatively low reflectance
Low laser damage threshold
3、What UNI Optics can do for you?
Common Specifications:
Substrate Materials: N-BK7, Fused silica, Pyrex；Float glass
Dimensional tolerance: +/-0.1mm
Surface quality: 60-40
Parallelism: 3’
Flatness: λ/4 per 25mm@633nm
Bevel: Protective
One surface: Polished and Metallic coating
The other surface: Fine ground
Note: Aluminum is the most widely used metal reflection film, from near UV to near IR, have high reflectivity, and with low cost. Silver has higher reflectivity in the visible and near infrared wavelength than the aluminum film, but the silver in the air will be rapid oxidation, color darkening, makes the film performance and firmness declined rapidly. Gold film has a good consistency with high reflectivity in the near, middle and far infrared range, can control the thermal radiation effectively, but it is relatively soft, easy bruising, and should be paid very close attention to clean, and the cost is very high.
FA Lens UN-TFA3520L-10MP
For High-Precision Machine Vision Applications: Consumer Electronics Dimensional Inspection, Surface Defect Detection, OCR & Code Reading, Robotic Guidance, Biomedical Imaging and so on.
· High image contrast
· High brightness uniformity
· Suitable for 2.4u sensor
· Resolution up to 10MP
· Compact, lightweight and durable
Product information: Custom designs are available upon request.
MgF2 Coated Double-Convex (DCX) Lenses
FA Lens UN-TFA1220X-12MP
For high-precision machine vision applications, widely covering dimensional inspection and surface defect detection for consumer electronics, food and pharmaceutical packaging detection, printing & label inspection, robotic vision guidance and precise positioning, as well as in-line dimensional measurement of automotive components in typical industrial scenarios.
· High relative illumination and high contrast
· Low distortion and excellent corner brightness
· High resolution
· Compatible with 4/3" 12MP camera
Product information: Custom designs are available upon request.
FA Lens UN-TFA1224L-12MP
For high-precision machine vision applications, widely covering dimensional inspection and surface defect detection for consumer electronics, food and pharmaceutical packaging detection, printing & label inspection, robotic vision guidance and precise positioning, as well as in-line dimensional measurement of automotive components in typical industrial scenarios.
· High relative illumination and high contrast
· Low distortion and excellent corner brightness
· High resolution
· Compatible 1.2" 12MP camera
Product information: Custom designs are available upon request.
ITS Lens UN-AT3514CIR-8MP
For Intelligent Transportation Systems (ITS) Applications: Road Surveillance, ANPR/ALPR, Automatic Incident Detection, Traffic Enforcement Systems, Railway/Tunnel Safety Monitoring, etc.
· Excellent edge sharpness and uniform illumination
· Designed to resist strong light interference, adaptable to complex lighting conditions
· Ultra-high resolution, accurately capture license plates and facial details
Product information: Custom designs are available upon request.
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Email : sales@uni-optics.com
