Light beam generator and digital holography device for hypervelocity holography

Abstract

The invention relates to a light beam generator and a digital holography device for hypervelocity holography. The light beam generator comprises a pulsed laser and a multi-mode fiber coupler, wherein the multi-mode fiber coupler comprises an odd number of output ends on the same plane, and the number of the output ends is the same as that of beam splitting laser pulses; the optical fiber length differences among all the output ends are determined on the basis of a preset relative time delay, and the positions of all the output ends on the plane are determined on the basis of a preset spatial orientation angular difference; and the arrangement of the output ends ensures that any two output ends do not form central symmetry. The digital holography device comprises the light beam generator and a subsequent optical system, wherein the subsequent optical system comprises a second lens and a photosensitive device. By implementing the invention, laser pulses having different spatial orientation angle codes and strictly controlled relative time delays can be conveniently obtained so as to form a plurality of hypervelocity holographic images, and the invention has simple and compact structure and high system stability and reliability.

Description

technical field [0001] This invention relates to laser holography and, more particularly, to a multi-frame digital holographic device for extremely high-speed imaging. Background technique [0002] Utilizing the multi-parameters of holography and the parallelism of light waves, it is easy to realize multi-frame encoding of ultra-high-speed photography. Therefore, the use of holographic principles to realize multi-frame ultra-high-speed photography is an important field of non-tube ultra-high-speed technology, which has important academic significance and applications. prospect. [0003] With the rapid development of ultrashort pulse laser technology and CCD technology, the use of ultrashort pulse digital holography to record and reproduce ultrafast dynamic processes has gradually shown its irreplaceable superiority. Using ultrashort pulse digital holography, the ultrafast changing object field can be continuously exposed multiple times in a very short time, so that multiple...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a light beam for extremely high-speed holography in view of the defects that the adjustment of the spectroscopic device of the holographic device in the prior art is complicated, and the spatial azimuth and relative time delay of the reference light are difficult to control precisely. Generator, which can accurately and easily generate the required beam according to the predetermined reference light space azimuth and relative time delay

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