超短激光脉冲调制上转换放大

Ultrashort laser pulse up-conversion amplification based on modulation instability

在超短激光脉冲倍频过程中,由于调制不稳定性而产生多色圆锥辐射.在多色圆锥辐射的任意方向上同步注入一束宽带种子光,可以得到相应频率的调制上转换放大.放大的光脉冲的中心波长在500nm时单脉冲能量最大可至150μJ并且具有60nm的频谱宽度.通过改变种子光的入射角度而实现上转换放大中心波长的连续调谐,范围约为290nm.

Colored conical emission via spatiotemporal modulational instability was observed in second harmonic generation of untrashort laser pulses. By injecting accurately synchronized white-light super-continuum seed pulses, frequencies with maximal gain corresponding to the seed angle were amplified. The amplified pulse exhibited 150 mu J pulse energy and 60 nm spectral width (full width at half maximum) centered around 500 nm. Wide tunable range of the output wavelength up to 290 nm was realized by adjusting the input angle of the seed pulses.