- Although Nd:YAG was invented in the Sixties last century, it has been and is still the most commonly used solid-state crystal material. Nd:YAG crystals are wildly used in all types of solid-state lase..
Laser Crystals
Nd:YAG
Description
Although Nd:YAG was invented in the Sixties last century, it has been and is still the most commonly used solid-state crystal material. Nd:YAG crystals are wildly used in all types of solid-state lasers systems-frequency-doubled continuous wave, high-energy Q-switched, and so forth.
Its good fluorescent lifetime thermal conductivity and physical strengths makes it suitable for high power lamp pumped laser.
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1)
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Nd Dopant Concentration:
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0.5-1.2 atm%tolerance within 10% of concentration
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2)
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Diameter:
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3 ~ 14mm
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3)
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Length:
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1~ 160mm
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Typical Specification and Tolerance:
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1)
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Orientation:
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<111> crystalline direction (+/-0.5℃)
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2)
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Wavefront Distortion:
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<λ/10 at 632.8nm for 3 ~ 7mm <λ/8 per inch at 632.8nm for >=7mm |
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3)
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Surface Quality:
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better than 20/10 Scratch/Dig per MIL-O-1380A
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4)
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Parallelism:
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< 10 arc seconds
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5)
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Perpendicularity:
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< 5 arc minutes
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6)
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Surface Flatness:
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<λ/10 at 632.8nm
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7)
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Clear Aperture:
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Central 90%
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8)
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Chamfer:
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0.15x45°
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9)
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Damage Threshold:
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> 15J/cm2(uncoated ) > 700 MW/cm2(coated) |
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10)
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Coatings:
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a)AR@1064nm, R<0.1%; (see coating 9-1) b)AR@1064nm, R< 0.1%;HT@808nm, T>95%;(see coating 6-2) c)HR@1064nm, R>99.8%; HT@808nm, T>95%;(see coating 9-2) d)HR@1064nm, R>99.8%; HT@808nm, T>95%; HR@532nm, R>99%;(see coating 9-3) |
To inquiry or order a finished Nd:YAG laser rod, please specify the specification listed above, for common application, we only need to know the main specification: Nd-dopant concentration, sizes, and coating. For special request, please specify specification in details for evaluation and fabrication.
Physical and Optical Properties
| Chemical Formula | Nd:Y3A15O12 |
| Crystal Structure | Cubic |
| Lattice Constants | 12.01? |
| Concentration | ~ 1.2 x 1020 cm-3 |
| Melting Point | 1970 °C |
| Density | 4.56 g/cm3 |
| Mohs Hardness | 8.5 |
| Refractive Index | 1.82 |
| Thermal Expansion Coefficient | 7.8 x 10-6 /K [111], 0 - 250 °C |
| Thermal Conductivity | 14 W/m /K @20 °C, 10.5 W /m /K @100 °C. |
| Lasing Wavelength | 1064 nm |
| Stimulated Emission Cross Section | 2.8x10-19 cm-2 |
| Relaxation Time of Terminal Lasing Level | 30 ns |
| Radiative Lifetime | 550 ms |
| Spontaneous Fluorescence | 230 ms |
| Loss Coefficient | 0.003 cm-1 @ 1064 nm |
| Effective Emission Cross Section | 2.8 x 10-19 cm2 |
| Pump Wavelength | 807.5 nm |
| Absorption band at pump wavelength | 1 nm |
| Linewidth | 0.6 nm |
| Polarized Emission | Unpolarized |
| Thermal Birefringence | High |