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Holographic recording of filament formation with 150 femtosecond time resolution

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Abstract

Holographic recording with pulsed illumination [1] in the regime between 10 and 0.1 picoseconds is used to study ultra-fast events. A single-shot recording technique has been developed to capture non-repeatable events. The optical apparatus used to record a short movie (4 frames) with 150fs temporal resolution is shown in Figure 1a. A sequence of four laser pulses, each with 150fs duration illuminated the object. The time delay between the pulses was approximately 1ps. Each of the 4 pulses recorded a separate on-line (Gabor) hologram of the object. The four holograms were recorded on the surface of a conventional CCD camera whose output was digitized and the object reconstructions were digitally formed[2]. The result is shown in Fig. 1b. The object in this case was a 150 femtosecond light pulse that traverses the field of view of the recording beams. As this pump beam travels through air it causes dielectric breakdown and it leaves a trail of its path in the form of plasma that is optically detected. The four holograms recorded on the face of the CCD are shown in Figure 1b and their digital reconstructions are shown in Fig. 1c showing a short movie of single light pulse traveling through space.

© 2003 Optical Society of America

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