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首页> 外文会议>International conference on laser physics 2010 >Numerical modeling of difference frequency radiation generation by a few optical cycles duration pulse propagating in a quasi-phase-matching GaAs crystal
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Numerical modeling of difference frequency radiation generation by a few optical cycles duration pulse propagating in a quasi-phase-matching GaAs crystal

机译：在准相位匹配的GaAs晶体中传播几个光周期持续时间脉冲产生的差频辐射的数值模拟

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摘要

We present the results of numerical study of the generation process of difference frequency radiation (DFR) arising via interaction of mutually orthogonal linearly- polarized a few-cycle laser pulses propagating in a quasiphase- matching (QPM) GaAs crystal. Considered the interaction of pulses having the central wavelengths of 1.98 μm, duration of 30 fs with the electric field amplitude 200 MV/m, propagating along the normal to the <110> plane. The period © of QPM GaAs crystal in numerical simulations varied from 20.89 μm to 53.23 μm. It is shown that by changing the grating period of QPM GaAs crystal from 23.02 μm to 37.29 μm it's possible to improve efficiency of QPM generation of DFR in 5.48 μm ÷ 10.12 μm spectral range at least by 8 dB in comparison with the generation of DFR in bulk crystal GaAs in the same spectral range.
机译：我们介绍了通过在正交相位匹配（QPM）GaAs晶体中传播的相互正交的线性偏振几个周期激光脉冲相互作用而产生的差频辐射（DFR）生成过程的数值研究结果。考虑了中心波长为1.98μm，持续时间为30 fs的脉冲与沿<110>平面的法线传播的电场幅度200 MV / m的相互作用。 QPM GaAs晶体的周期©在数值模拟中从20.89μm到53.23μm不等。结果表明，通过将QPM GaAs晶体的光栅周期从23.02μm更改为37.29μm，与在DFM中生成DFR相比，在5.48μm÷10.12μm光谱范围内，QPM生成DFR的效率至少提高了8 dB。在相同光谱范围内的块状晶体GaAs。

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