Er,Cr:YSGG
Chemical formula: Y2.93Sc1.43Ga3.64O12. Density: 5.67 g / cm3. Hardness: 8. Chamfer: 45 deg ±5 deg. Parallelism: 30 arc seconds. Perpendicularity: 5 arc minutes. Surface quality: 0 - 5 scratch-dig. Wavefront distortion: 1/2 wave per inch of length. YSGG (yttrium yttrium gallium garnet, source wording), doped with chromium and the undefined source term 'zhen', provides an efficient laser crystal for producing 2.8-micrometer light in an important water-absorption band.
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