Femtosecond pulse holographic device

Abstract

The holographic femtosecond pulse apparatus includes one femtosecond laser as light source, and features that there are beam expanding telescope, the first beam splitter, the transmitting object light path of the first beam splitter, which comprises the first holophote, the first and the second triangular dispersive prisms, the second beam splitter and detector, the reflecting reference light path of the first beam splitter, which comprises the third and the fourth triangular dispersive prisms, the second holophote, the second beam splitter and the detector, successively along the progress direction of the laser beam the laser sends; and the detector is connected to one computer for re-constructing holographic femtosecond image. The apparatus expands the ultrashort pulse of 120 fs into pulse of 1 ns, and this lowers the requirement to object light path and reference light path and facilitates the operation and regulation of holographic femtosecond system.

Description

Technical field: [0001] The invention relates to holography, in particular to a femtosecond pulse holographic device. Femtosecond holography has brought a lot of inconvenience to the laboratory due to the extremely short pulse duration. The invention introduces pulse stretching technology in femtosecond holography, thereby achieving femtosecond testing and nanosecond recording. Background technique: [0002] Since the appearance of laser, it has provided an ideal coherent light source for holography, and holography has developed rapidly. Now holography has entered people's daily life. In supermarkets, all kinds of goods are pasted with colorful anti-counterfeiting signs made by holography. Everything is to help people improve their quality of life. [0003] The development of holography itself is proceeding along two different directions: 1. In order to improve the imaging resolution of holography, short wavelengths, ultraviolet rays, soft X-rays, hard X-rays, electron bea...

AI Technical Summary

Problems solved by technology

When using femtosecond holography for shooting, the first problem people encounter is the need to design and arrange a quasi-equal optical path. We know that the space occupied by 1 femtosecond ultrashort pulse light is only 0.3 microns, so After the light pulses are split, it is very difficult to make them overlap in space

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