Fused Silica

Fused Silica

JGS1:

equivalent to Suprasil 1 and 2 (Heraeus), Spectrosil A and B (Saint-Gobain) and Coming 7940 (Coming), Dynasil 1100 and 4100 (Dynasil).

JGS1 is transparent in the ultraviolet and visible regions, and has no absorption hands in 170-250 nm wavelength intervals. It has 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:

equivalent to Homosil 1,2 & 3 (Heraeus), Dynasil 1000 & 4000 and 5000 & 6000 (Dynasil)

JGS2 provides good UV and visible transmission.It is close in physical and chemical properties to JGS1. Available in thin & small sheet pieces, JGS2 is virtually bubble-free. Elements built from large pieces will most likely contain bubbles, so application should not be sensitive to these inclusions. 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:

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. It has no absorption bands in the visible physical properies with outstanding optical characteristics in the deep UV and the IR wavelength range. It is those requiring very wide wavelength range from DUV to MIR. It is quite a bit more expensive than Silicon and slightly less expensive than Calcium Fluoride or ZnS Multi-spectral grade.

MATERIAL SPECIFICATION
PARAMETER VALUE
Maximum Size <Φ200mm
Transmission Range(Medium transmission ratio) 0.17~2.10um(Tavg>90%)
OH- Content 1200 ppm
Fluorescence (ex 254nm) Virtually Free
Impurity Content 5 ppm
Birefringence Constant 2-4 nm/cm
Melting Method Synthetic CVD
Applications Laser substrate: Window, lens, prism, mirror...
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)
Young's Modulus 7.2x10-10 Pa (10.5x106 psi)
Poisson's 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
Strength
Loss Factor
Dissipation Factor

3.75
5x107 V/m
Less than 4x10-4
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)
Helium
Hydrogen
Deuterium
Neon
(700°C)
210x10-10
21x10-10
17x10-10
9.5x10-17
Chemical Stability (except hydrofluoric) High resistance to water and acids

JGS1 JGS2 JGS3

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)
0.200
1.55051
1.000
1.45042
0.220
1.52845
1.064
1.44962
0.250
1.50745
1.100
1.44920
0.300
1.48779
1.200
1.44805
0.320
1.48274
1.300
1.44692
0.360
1.47529
1.500
1.44462
0.400
1.47012
1.600
1.44342
0.450
1.46557
1.700
1.44217
0.488
1.46302
1.800
1.44087
0.500
1.46233
1.900
1.43951
0.550
1.46008
2.000
1.43809
0.588
1.45860
2.200
1.43501
0.600
1.45804
2.400
1.43163
0.633
1.45702
2.600
1.42789
0.650
1.45653
2.800
1.42377
0.700
1.45529
3.000
1.41925
0.750
1.45424
3.200
1.41427
0.800
1.45332
3.370
1.40990
0.850
1.45250
3.507
1.40566
0.900
1.45175
3.707
1.39936

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