High-Speed Hologram Streak Camera System : Development and Application

我们试图研制一种能够记录快速事件全息信息的超高速条纹照相机系统。这种新型照相机所拍摄的记录被命名为“条纹全息图”。本发明提供一种全息照相装置，其能够将通过脉冲激光记录包含在全息图中的移动体的形状和坐标的精确信息，以及通过条纹照相机实现的时间分辨记录的优点结合在一起，从胶片的片材上切下直径为100 mm的环形高分辨率胶片，并将其安装在胶片保持用的duralmin盘上，然后由空气涡轮机主轴驱动旋转至高速。薄膜边缘的最大条纹速度约为300 m/s。直接驱动机制使我们可以使用F数为1的非常小的中继透镜系统，这是保证全息记录质量的关键因素。我们构造了一个长脉冲染料激光器系统作为这种激光器的光源 ...更多信息 RA.使用罗丹明6 G乙醇溶液，并且闪光灯泵浦。输出激光脉冲功率约500 W，脉宽约30 μ s，首次用于100 μ m桥丝爆炸的观测。已发现的条纹图案丢失后1 μ s内的电线爆炸发生。这可能是由于爆炸后金属丝材料的快速膨胀所致，对全息图的精确观察表明，几条主条纹会聚得非常快，用1 W氩离子激光器作光源观察到了其它几种现象。由100 mm的铜线制成的单摆、同一铜线的受迫振荡以及光纤的受迫振荡，以及直径约100 μ m的玻璃珠的自由下落过程。在这些实验的结果中，从条纹全息图的条纹形状估计每个粒子的速度是非常容易的。这些记录为这项技术的可行性和实用性提供了非常有吸引力的示范。少

We have tried to develop a very high-speed streak camera system capable of recording the holographic information on the fast events. The record taken by this new type of camera has been named as the "streak hologram". It enables the advantages of recording the precise information on the shape, and the coordinates of the moving bodies included in the holograms by a pulse laser, and the time resolved record realized by the streak camera, to be put together.A ring-shaped high-resolution film of 100 mm diameter is cut out from a sheet stock of the film, and is mounted on a film holding duralmin disk, which is then driven to rotate up to high speed by an air turbine spindle. Maximum streak velocity on the periphery of the film is around 300m/s. Direct film drive mechanism allows us to use the relay lens system of extremely small F number 1, which is the key factor to ensure the quality of holographic recording.A long-pulse dye laser system has been constructed as a light source of this came … More ra. Rhodamine 6G ethanol solution is used, and flashlamp pumped. The output laser pulse is of about 500W and 30 mus duration.The system has been first used to observe the explosion of bridge wire of 100 mum diameter. The fringe pattern has been found to be lost within 1 mus after the wire explosion takes place. This may be attributed to the very fast expansion of wire material after explosion, and the precise inspection of the hologram has revealed that several main fringe is seen to converge very fast.Other several phenomena have been observed by an argon-ion laser of 1 W as a light source. A simple pendulum made of copper wire of 100 mm, forced oscillation of the same wire, and also of an optical fiber, and the free fall process of glass beads of around 100 mum diameter. Among the results of these experiments, it is very easy to estimate the velocity of each particle from the fringe shape of the streak hologram. These records serve the very attractive demonstration for the feasibility and usefulness of this technique. Less