Nd:YAG
• Advantages of Nd:YAG crystals
• High efficiency
• Low threshold
• High gain
• high-average power laser
• High optical quality
• Good thermal conductivity and thermal shock characteristics
• Large mechanical strength
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• Nd:YAG Standard Specification
--Nd:YAG Standard Specification-- |
Nd Dopant Concentration |
High |
1.1¡À0.1at% |
Middle |
0.9¡À0.1at% |
Low |
0.7¡À0.1at% |
Crystallographic Orientation |
|
[111]within 5¡ã |
Wavefront Distortion |
|
¡Ü0.125¦Ë/inch |
Extinction Ration |
|
¦µ3 -¦µ6.35mm: ¡Ý28dB |
|
¦µ7-¦µ10mm: ¡Ý25dB |
|
¦µ 11- ¦µ 13mm: ¡Ý22dB |
|
¦µ 14- ¦µ 15mm: ¡Ý18dB |
Dimensional Tolerances |
Diameter |
¡À 0.005mm |
Length |
¡À 0.05mm |
End Surface Finish |
Flatness/Sphericity |
¡Ü0.1 wave |
Scratch-Dig |
10-5 (per MIL-O-13830A) |
End Configuration |
Parallelism |
¡Ü 10" |
Perpendicularity |
¡Ü 5¡ä |
Chamfer |
Depth: |
0.05¡À0.03 inch |
Angle: |
45¡À5¡ã |
Coating |
Anti-reflection, R ¡Ü 0.25%, or other kinds of coatings upon requirement |
• Nd:YAG Material Properties |
Nd:YAG Material Properties |
Formula |
Nd: Y 3 AL 5 O 12 |
Crystal Structure |
Cubic |
Moh Hardness |
8.5 |
Melting Point |
1970¡ãC |
Density |
4.55 g/cm 3 |
Atomic Density |
1.38 x 10 20 atoms/cm 3 |
Thermal Conductivity |
0.14Wcm -1 K -1 |
Thermal Expansion |
6.9 x 10 -6 / o C -1 (111) |
Stimulated Emission Cross Section |
2.8x10 -19 cm 2 |
dn/dT |
7.3 x 10 -6 o C -1 |
Young's Modulus |
3.17x10 4 kg/mm--- -2 |
Poisson Ratio |
0.25 |
Lasing Wavelength |
1064nm |
Index of Refraction |
1.8197 at 1.0 mm |
Fluorescent Lifetime |
230 ms |
Pumping Wavelength |
807.5 nm |
Thermal Shock Resistance |
790 Wm -1 |
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