Home > Laser crystals > Nd:YAG > Nd:YAG crystals
Nd:YAG crystals
Invented in the sixties of the last century, Nd:YAG(Neodimium Doped Yttrium Aluminum Garnet) has been and continue to be the most widely used laser crystal for solid-state crystal material. Its laser parameters are a good compromise between the strengths and weaknesses of its competition. Nd:YAG crystals are used in all types of solid-state lasers systems-frequency-doubled continuous wave, high-energy Q-switched, and so forth. Compared with others laser crystals, its fluorescence lifetime is twice more than Nd:YVO4, and thermal conductivity is also better. Red Optronics supplies quality Nd:YAG rods with high optical homogeneity, consistent performance, and high processing accuracy.
◇ Nd:YAG can produce blue laser with the frequency-doubling of 946nm
◇ Nd:YAG can be operated in a very high power laser up to kw level
◇ Nd:YAG can be Q-switched with Cr4+YAG directly
◇ Due to the cubic symmetry and high quality, Nd:YAG is easy to operate with
◇ TEM00 mode
|
Physical and Chemical Properties
|
|
|
Chemical Formula
|
Nd:Y3A15O12
|
|
Crystal Structure
|
Cubic Garnet
|
|
Lattice Constants
|
12.01Å
|
|
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
|
|
Thermal Conductivity
|
14 W/m /K @20°C ,
10.5 W /m /K @100°C
|
|
Physical and Optical properties
|
|
|
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
|
|
Pump Wavelength
|
807.5 nm
|
|
Loss Coefficient
|
0.003 cm-1 @ 1064 nm
|
|
Effective Emission Cross Section
|
2.8 x 10-19 cm2
|
|
Absorption band at pump wavelength
|
1 nm
|
|
Linewidth
|
0.6 nm
|
|
Thermal Birefringence
|
High
|
|
Polarized Emission
|
Unpolarized
|
|
Optical Parameter of Nd:YAG crystal
|
|||
|
Diameter (mm)
|
Standard grade
|
Excellence grade
|
Superexcellence grade
|
|
φ3-6.35
|
≤0.5 fringes/ inch
|
≤0.25 fringes/ inch
|
≤0.1 fringes/ inch
|
|
≥25dB
|
≥28dB
|
≥30dB
|
|
|
φ7-10
|
≤0.7 fringes/ inch
|
≤0.4 fringes/ inch
|
≤0.16 fringes/ inch
|
|
≥22dB
|
≥25dB
|
≥28dB
|
|
|
φ11-13
|
≥22dB
|
≤0.6 fringes/ inch
|
≤0.2 fringes/ inch
|
|
≥20dB
|
≥23dB
|
≥26dB
|
|
|
φ14-16
|
≤1.2 fringes/inch
|
≤0.8 fringes/inch
|
≤0.25 fringes/inch
|
|
≥18dB
|
≥20dB
|
≥23dB
|
|
|
Main Specifications
|
|
|
Nd dopant concentration
Dopant tolerance |
0.3~2.0(±0.1)atm%
|
|
Dimension
|
size up to dia.15x160mm and maximum diameter of dia.40mmx2mm
|
|
Anti-reflection Coating
High transmission Coating High reflection Coating |
R<0.25% per surface (@1064nm)
R<5%@808nm
R>99.8% @ 1064nm |
|
Orientation
|
<111> crystalline direction (+/-30arc)
|
|
Wavefront Distortion
|
λ/8
|
|
Sccratch/Digv
|
10/5 @MIL-PRF-13830B
|
|
Parallelism
|
< 10 arc seconds
|
|
Perpendicularity
|
< 5 arc minutes
|
|
Surface flatness
|
λ/10
|
|
Clear aperture
|
Central 95%
|
|
Chamfer
|
0.1mmx45°
|
|
Damage threshold
|
>500MW/cm^2
|