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提出了一种用于增大基于电光相位调制时间透镜孔径的参数调制法,理论推导出该方法的实现原理,并结合时间透镜在光脉冲压缩中的应用,研究了调制参数Q对时间孔径和脉冲压缩效果的影响。结果表明,对于文中调制频率为20GHz,理想压缩系数为5的时间成像系统,采用这种方法可将仅占调制周期15.6%的时间孔径提高到50%以上,并将脉冲压缩系数由3.11提升到4.46。同时,通过选取相反的输入和输出段色散,还可有效降低时间系统的调制电压。研究结果表明,该参数调制法只需对时间透镜本身参数做调整,无需引入新器件,便可有效地增大时间透镜的孔径,提高脉冲压缩系数,使其更接近理想值。该研究成果为电光相位调制时间透镜系统的性能提升提供了一种简洁而有效的手段。
A parametric modulation method is proposed to increase the lens aperture based on electro-optic phase modulation. The principle of the method is deduced theoretically. Combined with the application of time lens in optical pulse compression, the effects of modulation parameters Q on time aperture and Impulse compression effects. The results show that for the time-frequency imaging system with a modulation frequency of 20GHz and an ideal compression factor of 5, the time aperture of 15.6% of the modulation period can be increased to above 50% and the pulse compression coefficient can be increased from 3.11 4.46. At the same time, by selecting the opposite input and output segment dispersion, but also effectively reduce the modulation voltage of the time system. The results show that the parameter modulation method only needs to adjust the parameters of the time lens itself, which can effectively increase the aperture of the time lens and increase the pulse compression coefficient to be closer to the ideal value without introducing new devices. The research results provide a simple and effective method for improving the performance of electro-optical phase modulation time lens system.