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Lead Molybdate (PbMoO4 or PM) crystal is one of the most efficient materials used for acousto-optic devices. It has been extensively used for acousto-optic modulators, deflectors and phase-shifters. Crystals of Lead Molybdate with the diameter of up to 60 mm and 60 - 80 mm in length are grown by the Czochralsky-Kyropulos method. Lead Molybdate AO elements possess low optical losses, high optical homogeneity, stability to laser radiation. High crystal homogeneity also allows vacuum thermo - pressure bonding for large aperture devices.
| Chemical Formula | PbMoO4 |
| Crystal Structure | Tetragonal |
| Density | 6.95 g/cm3 |
| Melting Temperature, | 1330 K |
| Hardness (Mohs) | 3 |
| Transmittance Range | 0.42-5.5 mm |
| Transmittance at 515 nm for 6 mm light path | > 70 % |
| Refractive Index at 633 nm | no=2.38 ne=2.25 |
| Sound Velocity, L (001) mode, m/s | 3,750 |
| Sound Attenuation at 500 MHz, dB/cm | 2.5 |
| AO Figure of Merit M2, s3/g | 37 x 10-18 |
| Reflection Loss per surface, % single wave AR coating broadband (450-900 nm) AR coating |
< 0.2 < 0.6 |
| Wavefront distortion | less than l/8 @ 633nm |
| Dimension tolerance | (W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm) |
| Clear aperture | > 90% central area |
| Flatness | l/8 @ 633nm |
| Scratch/Dig | 10/5 to MIL-O-13830A |
| Parallelism | better than 20 arc seconds |
| Perpendicularity | 5 arc minutes |
| Angle tolerance | qD < ± 0.5°, fD < ±0.5° |
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