Texas A&M University, College Station, TX, 77843, USA.
M.V. Lomonosov Moscow State University, Physics Department, International Laser Center, 119992 Moscow, Russia.
Sci Rep. 2017 Mar 7;7:43367. doi: 10.1038/srep43367.
We present a method by which the spectral intensity of an ultrafast laser pulse can be accumulated at selected frequencies by a controllable amount. Using a 4-f pulse shaper we modulate the phase of the frequency components of a femtosecond laser. By inducing femtosecond filamentation with the modulated pulse, we can concentrate the spectral amplitude of the pulse at various frequencies. The phase mask applied by the pulse shaper determines the frequencies for which accumulation occurs, as well as the intensity of the spectral concentration. This technique provides a way to obtain pulses with adjustable amplitude using only phase modulation and the nonlinear response of a medium. This provides a means whereby information which is encoded into spectral phase jumps may be decoded into measurable spectral intensity spikes.
我们提出了一种方法，通过该方法可以将超快激光脉冲的光谱强度以可控的量累积在选定的频率上。我们使用 4-f 脉冲整形器来调制飞秒激光的频率分量的相位。通过用调制脉冲诱导飞秒光丝化，我们可以将脉冲的光谱幅度集中在各种频率上。脉冲整形器施加的相位掩模确定了发生累积的频率以及光谱浓度的强度。该技术提供了一种仅使用相位调制和介质的非线性响应即可获得具有可调幅度的脉冲的方法。这提供了一种手段，通过该手段，编码在光谱相位跃变中的信息可以被解码为可测量的光谱强度尖峰。
