Schott LG-750 Phosphate Laser Glass

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Schott LG-750 Phosphate Laser Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	LG-750 is the potassium-barium-aluminum-phosphate based glass with a high cross section for stimulated emission, low nonlinear refractive index, and good thermal characteristics. This glass was initially developed for the US DOE NOVA Laser Facility. The glass property space of this glass is extensively discussed in “Effect of composition on the thermal, mechanical, and optical properties of phosphate laser glasses” Proc SPIE, Vol 1277, 121-139 (1990). Information provided by SCHOTT.
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Physical Properties	Original Value	Comments

Density	2.83 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	3.0	pH = 0.3 at 25 °C
Alkali Class, AR	3.0	pH = 12 at 50 °C
Stain Resistance Class, FR	1.0	pH = 4.6 100 h at 25 °C

Mechanical Properties	Original Value	Comments
Hardness, Knoop	290	0.1/20
Modulus of Elasticity	50.1 GPa
Poissons Ratio	0.256
Fracture Toughness	0.480 MPa-m½	K_IC
Shear Modulus	19.9 GPa	Calculated

Thermal Properties	Original Value	Comments
CTE, linear	114 µm/m-°C @Temperature 20.0 - 40.0 °C
	130.1 µm/m-°C @Temperature 20.0 - 300 °C
Specific Heat Capacity	0.720 J/g-°C
Thermal Conductivity	0.490 W/m-K @Temperature 25.0 °C
	0.520 W/m-K @Temperature 90.0 °C
Transformation Temperature, Tg	450 °C

Optical Properties	Original Value	Comments
Refractive Index	1.526
	1.516 @Wavelength 1054 nm
	1.524 @Wavelength 633 nm
Transmission, Visible	68.2 %

Descriptive Properties
Climatic resistance	2	Water Vapor at 40 – 50 °C for 30 h
Thermal Diffusivity	2.43 [10^-7 m²/sec]

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CSGT9938 / 183191

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