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[Active Glasses] ´Eye-safe´ laser glass [1] 
LG-940 is an Er- and Yb-doped phosphate-glass for use in flash-lamp or diode-pumped laser systems. It has a very low dn/dT, good athermal properties and a very high emission cross-section. Typical applications are laser range finding and medical lasers.
Active & Passive Laser Glasses: SCHOTT Advanced Optics | SCHOTT North America
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