New optical instantaneous imaging laser technique in detonic experiments

H. Croso; Claude Cavailler; Patrick Mercier; Gilles Behar; M. Henry

doi:10.1117/12.50551

1 January 1992 New optical instantaneous imaging laser technique in detonic experiments

H. Croso, Claude Cavailler, Patrick Mercier, Gilles Behar, M. Henry

Proceedings Volume 1539, Ultrahigh- and High-Speed Photography, Videography, and Photonics '91; (1992) https://doi.org/10.1117/12.50551
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

Dealing with dynamic behavior of solids, detonator initiation, shock and detonation waves and other fast processes implies a number of new techniques. We are working on wave propagation at velocities of several km/s, with states existing for only a few microseconds or even nanoseconds. In this case performances of our fastest rotating mirror framing cameras are not high enough to observe states of surface or large discontinuity zones (problem of dynamic blur). We have developed a new laser technique called Instantaneous Image (I.I.). This technique consists in recording a single image in a short exposure time to minimize the dynamic blur of our fast phenomena. We use a Q-switched Nd:YAG laser made of an oscillator, a pre-amplifier, a 16 mm diameter amplifier and a KDP crystal. The available energy is in the order of 200 mJ at 532 nm for a ten nanoseconds pulse duration. A large amount of work has been done to minimize the non uniformity of the delivered light, to eliminate speckle defects and to collect the most illumination light by an optimized optic device. Under these conditions a large diameter field image (D equals 200 mm) can be achieved with a resolution better than 15 line pairs/mm. With a double proximity focused microchannel plate image intensifier (M.C.P.) it is possible to obtain faster shuttered times (a few nanoseconds) with a higher gain to observe poor reflective surfaces. But under these conditions the resolution decreases drastically to some line pairs per millimeter.

Citation Download Citation

H. Croso, Claude Cavailler, Patrick Mercier, Gilles Behar, and M. Henry "New optical instantaneous imaging laser technique in detonic experiments", Proc. SPIE 1539, Ultrahigh- and High-Speed Photography, Videography, and Photonics '91, (1 January 1992); https://doi.org/10.1117/12.50551

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