Near-infrared broadband low-temporal-coherence optical parametric amplification
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摘要: 在激光驱动惯性约束核聚变研究中，具有宽带、低相干特性的时间低相干光源将有望降低激光与等离子体相互作用的不稳定性，成为新一代激光驱动装置的有力竞争者。实现高功率低相干光放大输出是低相干光驱动器能否应用于惯性约束聚变领域的核心。光参量放大具有大带宽、高增益、无热效应等优势，可避免能级型放大介质的光谱窄化问题，是实现宽带低相干光放大的有效方案。系统阐述了宽带时间低相干光参量放大技术的原理和技术特性，并基于实验验证了采用非共线相位匹配的近红外波段宽带时间低相干光级联参量放大过程，最终实现
$ 7 \times {10^7} $ 的放大增益和13.19%的转换效率。Abstract: In the research of the laser-driven inertial confinement nuclear fusion, a low-temporal-coherence light source with broadband and low-coherence characteristics is expected to reduce the instability of the interaction between laser and plasma and to become a strong competitor of a new generation laser driving devices. Realizing high-power low-coherence optical amplification output is the core of whether low-coherence optical drivers can be applied of inertial confinement fusion. Optical parametric amplification has the advantages of large bandwidth, high gain and no thermal effect, etc., which can overcome the spectrum narrowing of the energy-level amplifying medium; it is also an effective solution for realizing broadband low-coherence optical amplification. This paper systematically expounds the principle and technical characteristics of temporally low-coherence optical parametric amplification technology. Carrying out the experiment through near-infrared broadband low-coherent optical cascade parametric amplification process with non-collinear phase match, we reach the final amplification gain of$ 7 \times {10^7} $ and conversion efficiency of 13.19%. -
图 2 OPA过程的数据模拟结果
Figure 2. Numerical simulation temporal characteristics of OPA processes
图 3 泵浦光走离角随相位匹配角的变化
Figure 3. Variation of pumping walk-off angle with phase matching angle in different noncollinear crystal
图 4 泵浦光与信号光相位匹配角随非共线角的变化
Figure 4. Variation of pump-signal noncollinear angle with phase matching angle in different noncollinear crystal
图 6 输入信号光时域、频域分布和泵浦光时域分布图
Figure 6. Spectral and temporal profile of the broadband incoherent pulse and temporal profile of the input pump
图 7 宽带时间低相干光参量放大过程时域分布图
Figure 7. Time domain distribution of the broadband incoherent pulses
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