BBO晶体的特性

2005/4/5/11:4主要性能：

    BBO 是一种负单轴晶体，它的o-ray折射系数（n_o）要比e-ray（n_e）折射系数大，可通过Selleimer方程来计算(λ in μm):

    n_o²=2.7359+0.01878/(λ²-0.01822)-0.01354λ²
    n_e²=2.3753+0.01224/(λ²-0.01822)-0.01516λ²

结构和物理特性：

晶体结构                         三方晶系，空间群 R3c
            单孢参数                         a=b=12.532A,c=12.717A,Z=7
            熔点                             1095±5℃
            相变点                           925±5℃
            光学均匀性                       δn≈10^-6/cm
            莫氏（Mohs）硬度                 4
            密度                             3.85 g/cm³
            吸收系数                         <0.1%/cm(at 1064nm)
            比热                             1.91J/cm³xK
            潮解性                           低
            热膨胀系数                       a,4 x 10^-6/K;   c, 36 x 10^-6/K
            热导率                           ⊥c,1.2W/m/K;  //c, 1.6W/m/K

线性光学特性

          透光范围                             189-3500nm
          折射系数                             
           1064 nm                             n_e=1.5425,n_o=1.6551
            532 nm                             n_e=1.5555,n_o=1.6749
           266  nm                             n_e=1.6146,n_o=1.75711 

          热光系数

            dn_o/dT=-9.3x 10^-6/℃
            dn_e/dT=-16.6x 10^-6/℃ 

非线性光学特性：

          相位匹配输出波长                      189-1750nm
          非线性光学系数

                                                 d₁₁=5.8 x d₃₆(KDP)

          非线性光学系数                         d₃₁=0.05 x d₁₁

                                                 d₂₂<0.05 x d₁₁
          电光系数                               γ₁₁=2.7pm/V,γ₂₂,γ₃₁<0.1γ₁₁
          半波电压                               48KV(1064 nm)

损失阈值

           1064nm                                5 GW/cm² (10ns);10GW/cm² (1.3ns)
            532nm                                1 GW/cm² (10ns);7GW/cm² (250ns)