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Passive Q-Switch Crystals |
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Cr4+:YAG for passive Q-Switching of solid-state lasers 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 pumped or lamp-pumped Nd:YAG, Nd:YLF, Yb:YAG or other Nd and Yb doped lasers at wavelength from 1.0 to 1.2 mm. Because of its chemically stability, durability, UV resistance, good thermal conductivity, and high damage threshold (> 500 MW/cm2), it will replace traditional materials such as LiF, organic Dye and color centers. Physical and Optical Properties: |
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| Chemical Formula | Cr 4+:Y3 A15 O12 | | Crystal Structure | Cubic garnet | | Recovery time | 8.5 µs | | Hardness Mohs | 8.5 | | Density | 4.56g/cm3 | | Orientation | [100]+/-10° | | Thermal conductivity | 12.13w/m/k | | Refractive index | 1.82 @ 1064nm | Optical Properties: |
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| Base state absorption cross section | σ s 1 =4.3x10-18 cm2 | | Emission state absorption cross section | σ s 2 =8.2x10-19 cm2 | | Fluorescence lifetime | 3.4us | Capabilities: |
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| Cr4+ dopant concentration | 0.5 mol% ~ 3 mol% | | Aperture | 2x2 ~ 14x14mm | | Initial transmission | 10% ~ 99% | Typical Specification and Tolerance: |
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| Dimension tolerance | (W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm) | | Flatness | < λ/8 @ 633nm | | Scratch/Dig code | better than 10/5 Scracth/dig per MIL-O-13830A | | Parallelism | < 20 arc seconds | | Perpendicularity | < 5 arc minutes | | Wavefront distortion | less than λ/8 @ 633nm | | Clear aperture | > 90% central area | | Coating | Anti-reflective |
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