Optical parametric amplification (OPA) is a promising method of producing extremely intense light. A new OPA scheme with comprehensively high performance is urgently required for future development. In this study, an amplification scheme known as crossed‐Fabry‐Perot‐cavity OPA (XOPA) is proposed. It is based on the principle of periodic idler elimination, which prevents energy back‐conversion among the three coupling waves, resulting in a monotonically increasing overall conversion efficiency. Using a signal at 808 nm and a pump at 532 nm, a chirped pulse XOPA is experimentally demonstrated with a conversion efficiency of 56.28% and a gain bandwidth of 120 nm. The measured pulse duration after compression is 19.2 fs, which is comparable to the Fourier‐transform‐limited 16.8 fs. Further investigations revealed several advantages. Stable pulse shaping in spatial, temporal, and frequency domains is realized by a spatiotemporally modulated pump. Pulse contrast adjustability on the front edge of the signal is verified in the XOPA of different Fabry‐Perot cavity lengths. These results indicate astringency and precise regulation of output in nonlinear processes. Considering numerous crystals suitable for noncollinear configurations from the near‐infrared to mid‐infrared regions, XOPA has a universal potential application in laser systems with extreme intensity, few‐cycle duration, and internal confinement fusion drivers.

中文翻译：

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交叉法布里-珀罗腔中的光学参量放大

光学参量放大（OPA）是一种产生极强光的有前途的方法。未来的发展迫切需要一种全面高性能的新型OPA方案。在这项研究中，提出了一种称为交叉法布里-珀罗腔 OPA (XOPA) 的放大方案。它基于周期性闲频消除原理，防止三个耦合波之间的能量反向转换，从而导致整体转换效率单调递增。使用 808 nm 的信号和 532 nm 的泵浦，实验证明了啁啾脉冲 XOPA 的转换效率为 56.28%，增益带宽为 120 nm。压缩后测得的脉冲持续时间为 19.2 fs，与傅里叶变换限制的 16.8 fs 相当。进一步的调查揭示了几个优点。通过时空调制泵实现空间、时间和频域的稳定脉冲整形。信号前沿的脉冲对比度可调性在不同法布里-珀罗腔长度的 XOPA 中得到验证。这些结果表明非线性过程中输出的收敛性和精确调节。考虑到许多晶体适合从近红外到中红外区域的非共线配置，XOPA 在具有极高强度、少周期持续时间和内约束聚变驱动器的激光系统中具有普遍的潜在应用。