3-d holographic recording method and 3-d holographic recording system

Abstract

A method of 3D holographic recording by using a very simple optical system comprises: dividing a femto-second laser pulse into a plurality of light beams by a diffraction beam splitter (3), focusing four light beams selected from the divided plurality of light beam, and further focusing these four light beams into a sample (7) comprised of a photosensitive material capable of multi-photon exposure so that the photosensitive material is exposed to the interference among the four light beams and multi-photon absorption in the sample (7) is induced, thus recording a 3D phase hologram on the irradiated portion of the sample (7).

Description

TECHNICAL FIELD [0001] The invention of this application relates to a method of 3-D holographic recording on photosensitive materials capable of multi-photon exposure including glass that undergoes photo / thermo-induced refractive index change by means of femto-second laser pulses. More specifically, the invention relates to a 3-D holographic recording method of recording a Bragg diffraction lattice on a photosensitive material capable of multi-photon exposure by using a very simple optical system and femto-second laser pulses. BACKGROUND ART [0002] The development of photonics is expected to lead to the improvement of technology in future. In particular, photonic crystals (PhC) are intensely attracting interest, since they have promising applications. However, the fabrication of photonic crystals that function in the visible or near infrared range is a problem still in need of a solution, despite attempts using the latest developments in micro / nano technology. [0003] At present, as ...

AI Technical Summary

Benefits of technology

This approach allows for the easy formation of high-quality 3D photonic crystals by simplifying the optical system and enabling rapid multi-photon absorption, resulting in accurate and efficient recording of Bragg diffraction lattices in photosensitive materials like glass with photo / thermo-induced refractive index change.

Problems solved by technology

However, the fabrication of photonic crystals that function in the visible or near infrared range is a problem still in need of a solution, despite attempts using the latest developments in micro / nano technology.

However, it is very difficult in practice to experimentally realize such a system.

However, these recording methods have been attained by relatively slow process, such as shot-by-shot scanning.

In addition, conventional methods of recording 3D structure by using femto-second pulses necessitate a very complicated optical system of binding three or more light beams of pulses together at one point for interference exposure, since the pulse width of femto-second pulse is short, so that these methods are not practicable.

Images