排序方式: 共有81条查询结果,搜索用时 15 毫秒
51.
近红外瞬态脉冲波前高精度干涉检测技术 总被引:3,自引:0,他引:3
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。 相似文献
52.
介绍了基于啁啾脉冲放大(CPA)技术的100 TW级钛宝石激光装置SILEX-I。SILEX-I装置主要包括飞秒振荡器、Offner展宽器、多级放大器、以及对应的脉冲压缩器和靶室等。该装置可以输出5,30,100 TW级3个功率段,并分别配套相应的靶室系统,可以满足多种物理实验的需求。目前该装置的末级输出峰值功率达到286 TW,脉宽29.8 fs,靶面聚焦功率密度达到3.36×1020 W/cm2。 相似文献
53.
54.
The liquid crystal (LC) panel of a commercially-available LCD projector is successfully used for beam shaping, and a Gaussian beam is converted to a square super-Gaussian beam using the configuration of amplitude modulation. The additional phase modulations imposed by the LC modulator on the shaped beams are measured precisely using an interferometric technique. The experimental results have demonstrated that such a commerciallyavailable programmable spatial light modulator is applicable to beam shaping with negligible additional phase modulation. 相似文献
55.
Based on the principle that a rectangular function can be expanded into a sum of complex Gaussian functions with finite numbers, propagation characteristics of a Gaussian beam or a plane wave passing through apertured fractional Fourier transforming systems are analyzed and corresponding analytical formulae are obtained. Analytical formulae in different fractional orders are numerically simulated and compared with the diffraction integral formulae, the applicable range and exactness of analytical formulae are confirmed.It is shown that the calculating speed of using the obtained approximate analytical formulae, is several hundred times faster than that of using diffraction integral directly. Meanwhile, by using analytical formulae the effect of different aperture sizes on Gaussian beam propagation characteristics is numerically simulated, it is shown that the diffraction effect can be neglected when the aperture size is 5 times larger than the beam waist size. 相似文献
56.
Studies of beam propagation characteristics on apertured fractional Fourier transforming systems 总被引:1,自引:0,他引:1
Based on the principle that a rectangular function can be expanded into a sum of complex Gaussian functions with finite numbers, propagation characteristics of a Gaussian beam or a plane wave passing through apertured fractional Fourier transforming systems are analyzed and corresponding analytical formulae are obtained.Analytical formulae in different fractional orders are numerically simulated and compared with the diffraction integral formulae,the applicable range and exactness of analytical formulae are confirmed. It is shown that the calculating speed of using the obtained approximate analytical formulae,is several hundred times faster than that of using diffraction integral directly.Meanwhile,by using analytical formulae the effect of different aperture sizes on Gaussian beam propagation characteristics is numerically simulated, it is shown that the diffraction effect can be neglected when the aperture size is 5 times larger than the beam waist size. 相似文献
57.
58.
59.
60.