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我们理论研究了正交偏振双色激光场作用下的高次谐波发射和孤立阿秒脉冲的产生.当y方向加一束中红外激光脉冲(12.5 fs/2000 nm),x方向加一束强度较弱的激光脉冲(12 fs/800 nm)时,我们得到从250 eV到350 eV的超连续谐波平台,在平台范围内叠加50 eV的谐波,可以得到一个脉宽约为97as的孤立阿秒脉冲.通过时频分析,我们解释了高次谐波发射的物理机制.
We theoretically study the generation of high-order harmonics and isolated attosecond pulses under the action of a two-color laser field with orthogonal polarization.When a mid-infrared laser pulse (12.5 fs / 2000 nm) is applied in the y direction, a beam intensity For weak laser pulses (12 fs / 800 nm), we obtain a supercontinuum platform from 250 eV to 350 eV. By superimposing 50 eV harmonics over the platform range, we can obtain an isolated pulse width of about 97 μs A second pulse. By time-frequency analysis, we explain the physical mechanism of higher harmonic emissions.