Abstract The self-focusing and pulse sharpening of an intense short pulse laser in n-type indium antimonide, a semiconductor with non-parabolic energy band, is studied. The nonlinearity arises through the dependence of electron effective mass on quiver velocity and gives effective permittivity a saturating function of intensity. A laser beam with Gaussian transverse intensity profile undergoes periodic self-focusing. The faster self-focusing of the peak of the pulse causes significant sharpening of the pulse in course of propagation. For 10. 6 μ m CO2 laser of picosecond pulse length and intensity ∼ 1 – 2 GW/cm2, significant self-focusing and pulse length shortening occurs over a length of 0.6 mm.

中文翻译：

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n-InSb中亚皮秒激光脉冲的自聚焦和脉冲锐化

摘要 研究了非抛物线能带半导体n型锑化铟中强短脉冲激光的自聚焦和脉冲锐化。非线性是由于电子有效质量对颤动速度的依赖性而产生的，并且使有效介电常数成为强度的饱和函数。具有高斯横向强度分布的激光束经历周期性自聚焦。脉冲峰值的更快自聚焦导致脉冲在传播过程中显着锐化。对于皮秒脉冲长度和强度 ∼ 1 – 2 GW/cm2 的 10. 6 μm CO2 激光器，在 0.6 mm 的长度上发生显着的自聚焦和脉冲长度缩短。