Yb:YAG

Yb:YAG


Yb:YAG (Ytterbium Doped Yttrium Aluminum Garnet) is one of the most promising laser-active materials and more suitable for diode-pumping than the traditional Nd-doped systems. Compared with the commonly used Nd:YAG crystal , Yb:YAG crystal has a much larger absorption bandwidth to reduce thermal management requirements for diode lasers, a longer upper-laser level lifetime, three to four times lower thermal loading per unit pump power. Yb:YAG crystal at 1030nm is a good substitute for a Nd:YAG crystal at 1064nm and its second harmonic at 515nm may replace Ar-ion laser (with a large volume), which emit at 514nm.

Advantage

Very low fractional heating, less than 11%
Very high slope efficiency
Broad absorption bands, about 8nm@940nm
No excited-state absorption or up-conversion
Conveniently pumped by reliable InGaAs diodes at 940nm(or 970nm)
High thermal conductivity and large mechanical strength
High optical quality
 

 

 Basic Properties

Formula                             Yb3+:Y3Al5O12                                                   
Crystal Structure                     Cubic                                          
Lattice Parameters                     12.01 Å                                            
Melting Point                         1970˚C 
Density                                4.56g/ cm3                                                     
Mohs Hardness                        8.5
Specific Heat (0-20)                    0.59J/g.cm3                                       
Modulus of Elasticity                 310GPa                                          
Young's Modulus                         3.17×104Kg/mm                                 
Poisson Ratio                           0.3(est.)                                          
Tensile Strength                        0.13~0.26GPa                                    
Thermal expansion coefficient     [100]Direction:8.2×10-6/˚C(0~250˚C )              
[110]Direction:7.7×10-6/˚C(0~250˚C )                
[111]Direction:7.8×10-6/˚C(0~250˚C )                  
Thermal Conductivity                   14W/m/K(@20˚C )                                     
10.5W/m/K(@100˚C)                               
Thermal Optical Coefficient (dn/dT)                               7.3×10-6/˚C
Thermal Shock Resistance              790W/m                                        
Solubility                                Water: Insoluble;
Common Acids: Slightly                                      

Capability

Common Specification
Dopant Concentration Yb: 5~25 at% 
Extinction Ratio ≥28dB
Rod Sizes Diameter:2~20mm, Length:5~150mm 
Wavefront Distortion Less thanλ/8@632.8nm
Flatness Lambda/8 @632.8nm
Surface Quality (Scratch-Dig) Better than S/D10-5
Parallelism <5 arc seconds
Perpendicularity <15 arc minutes
Single Pass Loss ≤3×103cm-1

Notes:

Slabs, thread rod, Er:YAG, Nd:YAG, Cr:YAG,Ce:YAG, Tm:YAG,Ho:YAG and other ion doped YAG crystals are also available upon request.