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Schott LG-680 Silicate Laser Glass
Categories: Ceramic; Glass; Optical

Material Notes: LG-680 is the classic lithium-aluminum based glass with high cross section for stimulated emission, high ultraviolet transmission and high resistance to solarization.

Information provided by SCHOTT.

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Physical PropertiesMetricEnglishComments
Density 2.54 g/cc0.0918 lb/in³
 
Chemical PropertiesMetricEnglishComments
Acid Class, SR 1.01.0
Alkali Class, AR 1.01.0
Stain Resistance Class, FR 0.000.00
 
Mechanical PropertiesMetricEnglishComments
Hardness, Knoop 6206200.1/20
Modulus of Elasticity 90.1 GPa13100 ksi
Poissons Ratio 0.2420.242
Fracture Toughness 0.860 MPa-m½0.783 ksi-in½KIC
Shear Modulus 36.3 GPa5260 ksiCalculated
 
Thermal PropertiesMetricEnglishComments
CTE, linear  9.30 µm/m-°C
@Temperature 20.0 - 40.0 °C
5.17 µin/in-°F
@Temperature 68.0 - 104 °F
 10.18 µm/m-°C
@Temperature 20.0 - 300 °C
5.656 µin/in-°F
@Temperature 68.0 - 572 °F
Specific Heat Capacity 0.920 J/g-°C0.220 BTU/lb-°F
Thermal Conductivity  1.19 W/m-K
@Temperature 25.0 °C
8.26 BTU-in/hr-ft²-°F
@Temperature 77.0 °F
 1.35 W/m-K
@Temperature 90.0 °C
9.37 BTU-in/hr-ft²-°F
@Temperature 194 °F
Transformation Temperature, Tg 468 °C874 °F
 
Optical PropertiesMetricEnglishComments
Refractive Index 1.571.57
 1.558
@Wavelength 1054 nm
1.558
@Wavelength 1054 nm
 1.568
@Wavelength 633 nm
1.568
@Wavelength 633 nm
Transmission, Visible 57.51 %57.51 %
 
Descriptive Properties
Climatic resistance4
Thermal Diffusivity5.09 [10-7 m2/sec]

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