Laser crystal
Cr4+:YAG
Passive Q-Switching is preferred for simplicity of manufacturing and operation, low cost and reduced system size and weight. Cr4+:YAG (Y3Al5O12) is an excellent crystal for passively Q-switching diode..

Formula
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Cr4+:Y3Al5O12
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Crystal Structure
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Cubic Garnet
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Hardness
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8.5 (Mohs)
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Damage Threshold
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> 500 MW/cm2 for 10 ns pulses
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Refractive Index
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1.82 @ 1064 nm
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Flatness
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0.5 wave
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Parallelism
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< 30”
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Surface quality
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10/5 scratch/dig
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AR-coating
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R<0.3% @ 1064 nm
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Standard Aperture
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ɸ9.5 mm, 8x8 mm , 4x4 mm , ɸ 2.5 mm
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