【摘要】 超短光脉冲是由多谐波组成的波包,在具有周期螺旋结构的液晶中,由于偏振光的色散特性,脉冲的两个偏振态的波包群速不同,当光脉冲通过液晶时,两个相互垂直偏振分量相对延迟,根据脉冲宽度和液晶参数,计算两个波包分离所需的样品长度.更多还原

【Abstract】 The ultrashort pulse can be considered as a wave packet which is regarded as a superposition of monochromatic waves with different frequencies. Due to dispersion of polarized light in liquid crystals with spatial periodic helical structure, the packets of two polarized components of a pulse have different group velocities. When they propagate through the liquid crystal, two polarized components which are perpendicular to each other are delayed relatively. The length of a sample through which two packts are just separated is calculated as a function of the pulse duration and parameters of the liquid crystals.更多还原