Schott LG-940 Phosphate Laser Glass

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Schott LG-940 Phosphate Laser Glass
Categories:	Ceramic; Glass; Optical
Material Notes:	The LG-940 is an Erbium – Ytterbium – Chromium – Cerium doped phosphate based laser glass used in flash lamp pumped and diode pumped solid-state laser systems. Phosphate glasses generally offer higher solubility of rare earth dopants, thus the amount of active ions can be significantly increased. Applications Medical lasers for dermatological use Analytical instrumentation Rangefinders Advantages Good athermal properties High transmission at the lasing wavelength Consistent quality and high homogeneity Information provided by SCHOTT.
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Physical Properties	Original Value	Comments

Density	3.04 g/cc

Chemical Properties	Original Value	Comments
Acid Class, SR	4.3	pH = 0.3 at 25 °C
Alkali Class, AR	3.3	pH = 12 at 50 °C
Stain Resistance Class, FR	0.00	pH = 4.6 100 h at 25 °C

Mechanical Properties	Original Value	Comments
Hardness, Knoop	380	0.1/20
Modulus of Elasticity	57.6 GPa
Poissons Ratio	0.26
Shear Modulus	22.9 GPa	Calculated

Thermal Properties	Original Value	Comments
CTE, linear	81.1 µm/m-°C @Temperature 20.0 - 40.0 °C
	119.6 µm/m-°C @Temperature 20.0 - 300 °C
Thermal Conductivity	0.510 W/m-K @Temperature 25.0 °C
	0.610 W/m-K @Temperature 90.0 °C
Transformation Temperature, Tg	456 °C

Optical Properties	Original Value	Comments
Refractive Index	1.533
	1.522 @Wavelength 1540 nm
Transmission, Visible	62.2 %

Descriptive Properties
Climatic resistance	1-2	Water Vapor at 40 – 50 °C for 30 h

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CSGT9941 / 183194

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