论文部分内容阅读
惯性约束聚变(ICF)系统中高能瞬态脉冲激光由于脉冲时间短、能量高、波前畸变大,通常的检测方法难于检测脉冲激光波前。提出了一种基于空间相位调制技术可用于近红外瞬态波前高精度检测的环形径向剪切干涉仪。该系统可以以30~150 mm的圆瞳和方瞳口径、对波长为1064 nm的近红外纳秒级脉宽的脉冲激光波前实现共路、无参考面的瞬态、高精度的检测。系统的波前重构理论经过计算机仿真验证,精度达1/1000λ以上;检测结果与ZYGO数字波面干涉仪进行了比对,峰谷值、均方根值均优于1/15λ,并具有很好的可重复性。该系统目前已用于惯性约束聚变系统的脉冲检测,并且该技术适用于各种可见光和红外波段激光。
Due to the short pulse time, high energy and large wavefront distortion, high-energy transient pulsed lasers in inertial confinement fusion (ICF) systems are often difficult to detect pulsed laser wavefronts by conventional detection methods. A ring-shaped radial shear interferometer based on space-phase modulation technique is proposed for high-precision detection of near-infrared transient wavefront. The system can detect common-mode and non-reference surface transient and high-precision pulse laser pulses with near-infrared nanosecond pulse width at a wavelength of 1064 nm with a circular pupil and a square pupil diameter of ~30-150 mm . The wavefront reconstruction theory of the system has been verified by computer simulation and the accuracy is above 1 / 1000λ. The results of the comparison with the ZYGO digital wavefront interferometer show that the peak-to-valley and root mean square values are better than 1 / 15λ, Good repeatability. The system is currently used for pulse detection in inertial confinement fusion systems and is suitable for use in all visible and infrared laser ranges.