Grow Taylor, Gaeta Alexander
Opt Express. 2005 Jun 13;13(12):4594-9. doi: 10.1364/opex.13.004594.
We investigate the effects of beam ellipticity on the dynamics of multiple filamentation. We find that increasing the ellipticity of the initial beam decreases the power required for multiple filamentation. At lower input ellipticities, the beam breaks into filaments along its widest dimension, whereas for higher ellipticities the pulse breaks into bands and then into filaments as the power is increased. The breakup patterns of the beam along the wider dimension are consistent with the modulational instability, and these patterns are independent of polarization and noise. Numerical simulations are in qualitative agreement with these features of multiple filamentation breakup.
我们研究了光束椭圆率对多丝化动力学的影响。我们发现，增加初始光束的椭圆率会降低多丝化所需的功率。在较低的输入椭圆率下，光束沿其最宽维度分裂成细丝，而对于较高的椭圆率，随着功率增加，脉冲先分裂成带，然后再分裂成细丝。光束在较宽维度上的分裂模式与调制不稳定性一致，并且这些模式与偏振和噪声无关。数值模拟与多丝化分裂的这些特征在定性上相符。
