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Optical Grade Glass

Optical glass can change the direction of light, as well as relative spectral distribution of ultraviolet, visible or infrared light.Optical glass material is the most common type because of its excellent optical properties such as high light transmission and environmental stability.
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Optical glass can change the direction of light, as well as relative spectral distribution of ultraviolet, visible or infrared light.Optical glass material is the most common type because of its excellent optical properties such as high light transmission and environmental stability.

Nd-Vd diagram of Optical Glass

UNI-Optics has capability in manufacturing various optical components with a wide variety of optical materials.Selecting optical material is very important since each material has different optical characteristics, such as transmission versus wavelength, index of refraction, thermal, mechanical and chemical characteristics.You may need specific information when selecting the material for a custom component. The data in the following is intended to assist in these situations The simplest

way to select the right materials is to let UNI Optics know yourapplications, and our engineers would like to help you to select the right material from Chinese glass.

Contrast Table:
Contrast Table
QK series type
470668 H-QK1 FK1 FSL1 FC1 1.47047 66.83
487700 H-QK3 1.48746 70.04
487704 H-QK3L N-FK5 S-FSL5 FC5 1.48749 70.44
K series type
500621 K1 K11 1.49967 62.07
500660 H-K2 BK4 BSL4 BSC4 1.50047 66.02
505647 H-K3 BK5 1.50463 64.72
508611 K4A ZKN7 ZSL7 ZNC7 1.50802 61.05
510634 H-K5 BK1 BSL1 BSC1 1.51007 63.36
511605 H-K6 K7 NSL7 C7 1.51112 60.46
515606 H-K7 1.51478 60.63
516568 K8 NSL2 C2 1.51602 56.79
516642 H-K9L N-BK7 S-BSL7 BSC7 1.5168 64.2
518590 H-K10 S-NSL3 E-C3 1.51818 58.95
526602 H-K11 BALK1 NSL21 BACL1 1.52638 60.61
534555 H-K12 ZK5 ZSL5 ZNC5 1.53359 55.47
519617 H-K16 BACL3 1.51878 61.69
522595 H-K50 N-K5 S-NSL5 C5 1.52249 59.48
523586 H-K51 B270 NSL51 C12 1.52307 58.64
BaK series type
530605 H-BaK1 1.53028 60.47
540597 H-BaK2 N-BAK2 S-BAL12 BAC2 1.53996 59.72
547628 H-BaK3 BAL21 1.54678 62.78
552634 H-BaK4 N-PSK3 BAL23 PCD3 1.55248 63.36
561583 H-BaK5 1.56069 58.34
564608 H-BaK6 N-SK11 S-BAL41 BACD11 1.56388 60.76
569560 H-BaK7 N-BAK4 S-BAL14 BAC4 1.56883 56.04
573575 H-BaK8 N-BAK1 S-BAL11 BAC1 1.5725 57.49
574565 BaK9 BAK6 BAL16 BAC6 1.57444 56.45
560612 BaK11 SK20 BAL50 1.55963 61.21
ZK series type
569629 H-ZK1 PSK2 BAL22 PCD2 1.56888 62.93
583595 H-ZK2 SK12 S-BAL42 BACD12 1.58313 59.46
589613 H-ZK3 N-SK5 S-BAL35 BACD5 1.58913 61.25
609589 H-ZK4 SK3 BSM3 BACD3 1.60881 58.86
611558 H-ZK5 SK8 BSM8 BACD8 1.61117 55.77
613586 H-ZK6 N-SK4 S-BSM4 BACD4 1.61272 58.58
613606 H-ZK7 1.61309 60.58
614551 H-ZK8 SK9 BSM9 BACD9 1.61405 55.12
620603 H-ZK9A N-SK16 S-BSM16 BACD16 1.62041 60.34
622567 H-ZK10 N-SK10 S-BSM10 E-BACD10 1.6228 56.71
639555 H-ZK11 N-SK19 S-BSM18 BACD18 1.63854 55.45
603606 H-ZK14 N-SK14 S-BSM14 BACD14 1.60311 60.6
607595 H-ZK15 SK7 BSM7 BACD7 1.60729 59.46
614564 H-ZK19 SK6 BSM6 BACD6 1.61375 56.4
617539 H-ZK20 SSK1 BSM21 BACED1 1.6172 53.91
623581 H-ZK21 N-SK15 S-BSM15 BACD15 1.62299 58.12
607567 H-ZK50 SK2 BSM2 BACD2 1.60738 56.65
618551 ZK51 SSK4 BSM24 BACED4 1.61765 55.14
LaK series type
660574 H-LaK1 LAK11 LAL11 LAC11 1.6595 57.35
692545 H-LaK2 N-LAK9 S-LAL9 LAC9 1.69211 54.54
747510 H-LaK3 1.74693 50.95
641601 H-LaK4L N-LAK21 S-BSM81 LACL60 1.64 60.2
678555 H-LaK5 N-LAK12 S-LAL12 LAC12 1.6779 55.52
678555 H-LaK5A N-LAK12 S-LAL12 LAC12 1.6779 55.52
694534 H-LaK6A LAKN13 S-LAL13 LAC13 1.6935 53.38
713538 H-LaK7 N-LAK8 S-LAL8 LAC8 1.713 53.83
720503 H-LaK8A N-LAK10 LAL10 LAC10 1.72 50.34
651559 H-LaK10 N-LAK22 LAL54 LACL2 1.65113 55.89
697562 H-LaK12 LAK24 LAL64 1.6968 56.18
652584 H-LaK50 N-LAK7 S-LAL7 LAC7 1.6516 58.4
652584 H-LaK50A N-LAK7 S-LAL7 LAC7 1.6516 58.4
697555 H-LaK51 N-LAK14 S-LAL14 LAC14 1.6968 55.53
729547 H-LaK52 N-LAK34 S-LAL18 TaC8 1.72916 54.68
755523 H-LaK53 N-LAK33 S-YGH51 TaC6 1.755 52.32
755523 H-LaK53A N-LAK33 S-YGH51 TaC6 1.755 52.32
734515 H-LaK54 S-LAL59 TaC4 1.734 51.49
KF series type
501572 KF1 K10 FTL10 C10 1.50058 57.21
515545 KF2 KF3 NSL33 CF3 1.51539 54.48
526510 KF3 KF2 NSL32 CF2 1.52629 51
517522 H-KF6 KF6 NSL36 CF6 1.51742 52.31
QF series type
548459 QF1 LLF1 PBL1 FEL1 1.54811 45.87
548458 H-QF1 N-LLF1 S-TIL1 E-FEL1 1.54814 45.82
561468 QF2 LLF3 PBL3 FEL3 1.56091 46.78
575413 QF3 LF7 PBL27 FL7 1.57502 41.31
582420 QF5 LF3<, /o:p> PBL23 FL3 1.58215 42.03
532488 QF6 LLF6 PBL6 FEL6 1.53172 48.76
532488 H-QF6 N-LLF6 S-TIL6 E-FEL6 1.53172 48.84
541472 QF8 LLF2 PBL2 FEL2 1.54072 47.2
561452 QF9 LLF4 PBL4 FEL4 1.56138 45.24
578411 QF11 LF4 PBL24 FL4 1.57842
596392 H-QF14 F8 PBM8 F8 1.59551 39.18
581409 H-QF50 N-LF5 S-TIL25 E-FL5 1.58144 40.89
581409 QF50 LF5 PBL25 FL5 1.58144 40.89
581409 UQF50 ULF5 1.58144 40.89
F series type
603380 F1 F5 PBM5 F5 1.60342 38.01
603380 H-F1 F-TIM5 E-F5 1.60342 38.01
613370 F2 F3 PBM3 F3 1.61293 36.96
617366 F3 F4 PBM4 F4 1.61659 36.61
620364 F4 F2 PBM2 F2 1.62005 36.35
620364 H-F4 N-F2 S-TIM2 E-F2 1.62005 36.35
624359 F5 PBM11 1.62435 35.92
625356 F6 F7 F7 1.62495 35.57
636354 F7 F6 PBM6 F6 1.63636 35.35
624368 F12 F10 PBM10 1.62364 36.81
626357 F13 F1 PBM1 F1 1.62588 35.7
640346 H-F51 SF7 PBM27 FD7 1.6389 34.57
BaF series type
548540 BaF1 BALF5 BAL5 1.54809 53.95
570495 BaF2 BAF2 BAM2 BaF2 1.5697 49.45
580539 BaF3 BALF4 BAL4 BAFL4 1.5796 53.87
583465 BaF4 BaF3 BAM3 BaF3 1.58271 46.47
606439 BaF5 BaF4 BAM4 BaF4 1.60562 43.88
608462 BaF6 BAF52 BAF7 1.60801 46.21
614400 BaF7 1.61413 40.03
626391 BaF8 BASF1 BAM21 BAFD1 1.62604 39.1
603425 BaF51 BASF5 BAFD5 1.60323 42.48
571530 H-BaF53 S-BAL3 1.57135 53.97
ZBaF series type
622531 ZBaF1 SSK2 BSM22 BACED2 1.62231 53.14
802443 H-ZBaF1 NbFD14 1.80166 44.26
640483 ZBaF2 1.63962 48.27
657511 H-ZBaF3 1.65691 51.12
664355 ZBaF4 BASF2 BAH22 BAFD2 1.66426 35.45
671473 H-ZBaF5 S-BAH10 1.67103 47.29
607494 ZBaF8 BAF5 BAM5 BAF5 1.60729 49.4
620498 ZBaF11 BSM29 BACED9 1.62012 49.8
639452 ZBaF13 BAF12 BAM12 BAF12 1.6393 45.18
651383 ZBaF15 BAH24 BAFD4 1.65128 38.32
667484 H-ZBaF16 BAFN11 S-BAH11 BAF11 1.66672 48.42
668419 ZBaF17 BASF6 BAH26 BAFD6 1.66755 41.93
670392 ZBaF18 BASF12 BAH32 1.66998 39.2
702410 H-ZBaF20 N-BASF52 S-BAH27 BAFD7 1.70181 41.01
702410 ZBaF20A BASF52 BAH27 BAFD7 1.70181 41.01
702410 H-ZBaF20A 1.70181 41.01
723380 H-ZBaF21 BASF51 S-BAH28 BAFD8 1.7234 37.99
723380 ZBaF21A BASF51 BAH28 BAFD8 1.7234 37.99
658509 H-ZBaF50 N-SSK5 S-BSM25 BACED5 1.65844 50.85
683445 ZBaF51 BAF50 BAH51 BAF22 1.68273 44.5
670472 H-ZBaF52 N-BAF10 BAF10 1.67003 47.2
ZF series type
648338 ZF1 SF2 PBM22 FD2 1.64769 33.84
648338 H-ZF1 S-TIM22 E-FD2 1.64769 33.84
673322 ZF2 SF5 PBM25 FD5 1.6727 32.17
673322 H-ZF2 N-SF5 S-TIM25 E-FD5 1.6727 32.17
717295 ZF3 SF1 PBH1 FD1 1.71736
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Colored Glass Substrates
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.

UN Grade Fused Silica
UV Fused Silica
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.
IR Optics material
Infrared Optics Material

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.


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
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.

BK7 Plano-Convex Lenses
UV Fused Silica Plano-Convex (PCX) Lenses
A Plano-Convex (PCX) lens causes light to focus to a point,it has a positive focal length,which is ideal for light collimation or for focusing applications utilizing monochromatic illumination, in a range of industries. Uni-Optics offers PCX lenses with a variety of coating options.
Micro-components-Cone Lens
3mm Diameter, Aluminum Coated, Cone Lens
Cone lenses are cylindrical rod lenses with one end worked into a conical surface. The circumference of the rod is typically ground whereas the conical element is polished.
BK7 Anamorphic Prisms
High performance anamorphic prism
The Anamorphic prisms are used in pairs to magnify input beam size along one axis while leaving the other axis unchanged. The elliptical laser diode beams can be transferred into nearly circular.
Optical plano concave cylindrical lens supplier
Plano-concave rectangular Cylindrical Lenses

Plano-concave rectangular cylindrical lenses provide uni- axial negative imaging for anamorphic beam expansion and a wide range of applications.These lenses may also be used as mirror blanks if a concave cylindrical surface mirror is required.

BK7 Windows with AR coating
AR Coated BK7 Windows
BK7 window is the most common type of window. It has good performance over visible and near infrared wavelength regions. At the same time, BK7 window is ideal for applications require minimal transmitted beam deviation. It is suitable for AR coating.
Laser Windows
High Power Laser Line Windows

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

Laser Windows   Laser Windows

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

Fused Silica Wedges Prisms
N-BK7 and Fused Silica Wedge Prisms
Wedge prism is an optical element with plane-inclined surfaces, usually the faces are inclined toward one another at a very small angles.  It diverts light toward its thicker portion.  Wedge prisms can be used as isolating components. Wedges may also be used to produce a small deviation which doesnt allow return to source.
Plano-Convex Circular Cylindrical Lenses
Optical glass Plano Convex Circular Cylindrical Lenses
Plano-convex circular cylindrical lenses are useful for line imaging or uni-axial magnification in a wide range of applications. These lenses may be combined with other lenses to form complex imaging systems.
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