We report a novel, to the best of our knowledge, all-optical discrete multilevel time-lens (DM-TL) design based on cross-phase modulation (XPM). In this approach, the pump is synthesized such as the quadratic phase modulation is applied to the probe in constant-level time-bins with a maximum phase excursion of ${2}\pi$. As a result, a considerable reduction in the required pump power is achieved in comparison to the conventional approach based on a parabolic pump. To illustrate the concept, the proposed DM-TL is here applied to the energy-preserving conversion of a continuous-wave (CW) signal into a train of pulses according to the theory of temporal Talbot array illuminators. We demonstrate CW-to-pulse conversion gains up to 12 at repetition rates exceeding 16 GHz, with a power saving with respect to the conventional parabolic TL that is more significant for increasing conversion gains.

中文翻译：

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通过分立的多级泵提高功率效率的非线性时间透镜。

据我们所知，我们报告了一种基于交叉相位调制（XPM）的全光学离散多级时间透镜（DM-TL）设计。在这种方法中，泵是合成的，例如将二次相位调制以恒定水平的时间段应用于探针，最大相位偏移为$ {2} \ pi $。结果，与基于抛物线泵的传统方法相比，可实现所需泵浦功率的显着降低。为了说明这一概念，根据时间Talbot阵列照明器的理论，将拟议中的DM-TL应用于连续波（CW）信号到脉冲序列的节能转换。我们展示了在超过16 GHz的重复频率下，CW到脉冲的转换增益高达12，相对于传统的抛物线TL而言，功率节省对于提高转换增益更为重要。