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Nd:YAG

Nd:YAG is the earliest and most famous laser host crystal. Since it combines great advantages in many basic properties, Nd:YAG is the ubiquitous presence for near-infrared solid-state lasers and their frequency-doubler, tripler, and higher order multiplier.


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Advantages Of Nd:YAG:
  ?   High gain;
  ?   Low threshold;
  ?   High efficiency;
  ?   Low loss at 1064nm;
  ?   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).

 

Table 1.Basic Properties

Chemical Formula

Y3Al5O12

Crystal Structure

Cubic

Lattice Constant

12.01?

Melting Point

1970°C

Density

4.5g/cm3

Reflective Index

1.82

Thermal Expansion Coefficient

7.8x10-6 /K<111>,0 - 250 ℃                                  

Thermal Conductivity 

14W/m/K, 20°C
10.5W/m/K, 100°C

Mohs hardness

8.5

Stimulated Emission Cross Section   

2.8x10-19 cm-2

Loss Coefficient

0.003 cm-1 @ 1064nm

Linewidth

0.6 nm

Radiative Lifetime

550 μs

 

Specifications of Nd:YAG crystal from CASTECH:

      ?   Dimention: size up to dia.15x180mm  and maximum diameter of  dia.40mmx2mm;
       ?   Nd Dopant Level: 0.3~2.0(±0.1)atm%;
       ?   Diameter Tolerance: ±0.05mm;
       ?   Length Tolerance:±0.5mm;
       ?   Perpendicularity:<5′;
       ?   Parallelism:<10″;
       ?   Wavefront distortion:λ/8;
       ?   Flatness:λ/10;
       ?   Surface quality: 10/ 5 @ MIL-O-13830A;
       ?   Coatings:HR-Coating: R>99.8%@1064nm and R<5% @808nm;
                           AR-Coating (Single layer MgF2):R<0.25% per surface (@1064nm);
       ?   Other HR coatings, such as HR @1064/532 nm, HR @946 nm, HR @1319 nm and other wavelengths are also available;
       ?   Damage Threshold: >500MW/cm??????????2 .

 

 

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

≤1 fringes/inch

≤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

 

High grade or specific Nd:YAG rods or slabs, and Nd:YAG rods for 946nm and 1319nm lasers can be provided. Er:YAG, Yb:YAG and other ion doped YAG crystals are also available upon request.    

 











 

 

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