|
● High gain
● Low threshold
● High efficiency
● Low loss at 1.06μm
● Good thermal conductivity and thermal shock characteristics
● Mechanical strength
● High optical quality
● Material characteristics that allow for various modes of operation
(CW,pulsed,Q-switched,mode locked,and cavity dumped)
Nd:YAG has been and continues to be the most mature and most widely used crystals for lasers, no matter solid state or lamp pumped, CW or pulsed.It possesses a combination of properties uniquely favorable for laser operations.
NdYAG with hot application in slab lasers.
Slab lasers represent one class of high-power solid-state bulk lasers, where the gain medium (laser crystal) has the form of a slab. Typically, a laser slab is thin in one dimension, compared with the larger extent in the other two directions. However, other lasers without a large aspect ratio of the gain medium are sometimes also called slab lasers, simply because their gain medium has a rectangular rather than a circular cross-section. Such lasers are actually often not very different from rod lasers, also in terms of power scaling
Specificaiton of Slab of NdYAG
Width |
|
Height |
|
Length |
|
Flatness |
S1&S2 <λ/10 at 633nm |
S3&S4 <λ/4 at 633nm |
|
Perpendicularity |
< 3 arc minutes |
Parallelism |
10 arc sec |
Surface quality |
S1,S2 S3,S4 10/5 per MIL-0-13830B |
Coating |
2um SiO2 layer with AR 808nm or upon customer request |
Properties of NdYAG:
Chemical Formula |
Nd:Y |
Crystal Structure |
Cubic |
Lattice Constants |
12.01Ä |
Concentration |
~ 1.2 x |
Melting Point |
|
Density |
|
Mohs Hardness |
8.5 |
Refractive Index |
1.82 |
Thermal Expansion Coefficient |
7.8 x 10-6 /K [111], 0 - |
Thermal Conductivity |
14 W/m /K @ |
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 |
|
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 |