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.

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.

1、What are laser windows? Laser Protect Windows(Laser protective glass, protective filters or welding protective windows) are used to save for the high cost of laser optics. 2、What are laser windows used for? These windows are normally used in applications like laser cutting, laser welding machine, they are used for avoiding the high-precision laser optics damage by material splashes. 3、The key features of UNI Optics' Laser Windows High Transmission High Damage Threshold Low Scatter Low Absorption Excellent Film Density Excellent Environmental Stability     Typical Specifications:   Dimension: 4mm-80mm, round or square Material: BK7, Fused Silica, ZnSe...etc Surface quality: 10/5 Surface flatness: Lambda/10@632.8nm Parallelism: 30’’ Roughness: 3A

For Color Sorter (Sorting Rice / Grain /Tea Leaf / Mineral, etc.)

· Developed for 30mm big frame sensor

· Large Aperture, up to F1.8
· High relative illumination
· Lens for 2K line scan camera
· Excellent optical performance, uniform imaging of center and edge

Product information: Custom designs are available upon request.

Product Features:

· Developed for 32mm big frame sensor

· Large Aperture, up to F2.8
· High relative illumination
· Lens for 2K, 4K, 8K line scan camera
· Excellent optical performance, uniform imaging of center and edge

For Automated Optical Inspection (AOI), Food Sorting, Recycling Sorting, etc.

· Developed for 1" image format
· Wavelength: 900-1700nm
· Large Aperture, upto F1.4
· Compact and lightweight design

For Photovoltaic Inspection, Pill / Capsule Detection, Print Inspection, Hyperspectral Camera, etc.

· Developed for 1" image format
· Wavelength: 900-1700nm
· Large Aperture, up to F1.4
· Compact and lightweight design