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             Nonlinear 
              Crystals
             Introduce
             Nonlinear 
              Crystals
             Laser 
              Crystals
               Nd:YAG 
               Er:YAG 
               Cr4+:YAG 
               Yb:YAG 
               Nd:YVO4 
               Nd:YLF 
               Ti:Sapphire 
               Cr:Mg2SiO4 
               Cr:LiSAF 
              & Cr:LiCAF 
             AO 
              & EO Crystals
             Optical 
              Crystals
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                   Ytterbium 
                    Doped Yttrium Aluminum Garnet (Yb: YAG) 
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                         Yb: 
                          YAG crystal is one of the most promising laser-active 
                          materials and more suitable for diode-pumping then the 
                          traditional Nd-doped systems. It can be pumped at 0.94μm 
                          laser output. Compared with the commonly used Nd: YAG 
                          crystal, Yb: YAG crystal has a much larger absorption 
                          bandwidth to reduces thermal management requirements 
                          for diode lasers, a longer upper-state lifetime, three 
                          to four times lower thermal loading per unit pump power. 
                          Yb: YAG crystal is expected to replace Nd: YAG crystal 
                          for high power diode-pumped lasers and other potential 
                          applications. 
                        Dream 
                          Lasers has developed a suitable technique 
                          to produce the Yb: YAG crystal High quality Yb: YAG 
                          crystals are available with different specifications. 
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                         5at% 
                          doped Yb:YAG Crystal 
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                         10at% 
                          doped Yb:YAG Crystal 
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                         20at% 
                          doped Yb:YAG Crystal 
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                         30at% 
                          doped Yb:YAG Crystal 
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                      Main 
                        Advantages:  
                         
                        ● 
                        Very low fractional heating, less than < 11%  
                        ● Very high slope efficiency 
                        ● Broad absorption bands, about 18nm @ 940nm 
                        ● No excited-state absorption or up-conversion  
                        ● Conveniently pumped by reliable InGaAs diodes at 940nm 
                        (or 970nm) 
                        ● High thermal conductivity and strength  | 
                     
                    
                      
                        
                           
                           
                            | Basic 
                              Properties  | 
                           
                           
                            | Chemical 
                              Formula | 
                            Yb: 
                              Y3Al5O12 | 
                           
                           
                            | Crystal 
                              Structure | 
                            Cubic | 
                           
                           
                            | Lattice 
                              Constants | 
                            12.01Ǻ | 
                           
                           
                            | Melting 
                              Point | 
                            1970℃ | 
                           
                           
                            | Density | 
                            4.56g/cm2 | 
                           
                           
                            | Mohs 
                              Hardness | 
                            8.5 | 
                           
                           
                            | Dopant | 
                            5~30% 
                              Yb | 
                           
                           
                            | Thermal 
                              Expansion Coefficient | 
                            7.8×10-6/K,[111],0-250℃ | 
                           
                           
                            | Thermal 
                              Conductivity | 
                            14W.s/m/K @ 20℃ | 
                           
                           
                            | Loss 
                              Coefficient | 
                            0.003cm-1 | 
                           
                           
                            | Index 
                              of Refraction | 
                            1.82 | 
                           
                           
                            | dn/dT | 
                            9×10-6/℃ | 
                           
                           
                            | Lasing 
                              Wavelength | 
                            1030nm,1050nm | 
                           
                           
                            | Fluorescence 
                              lifetime | 
                            1.2ms | 
                           
                           
                            | Emission 
                              cross section | 
                            2.2×10-20cm2 | 
                           
                           
                            | Pump 
                              Wavelength | 
                            0.9~1.0μm | 
                           
                           
                            | Absorption 
                              band about pump wavelength | 
                            18nm | 
                           
                           
                         
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