Optical: systems and elements – Holographic system or element – Having particular recording medium
Reexamination Certificate
2005-04-15
2009-06-02
Amari, Alessandro (Department: 2872)
Optical: systems and elements
Holographic system or element
Having particular recording medium
C359S022000, C430S001000
Reexamination Certificate
active
07542186
ABSTRACT:
A method of 3D holographic recording by using a very simple optical system includes dividing a femto-second laser pulse into a plurality of light beams by a diffraction beam splitter, focusing four light beams selected from the divided plurality of light beams, controlling each optical phase of the selected four light beams by a phase retarder, and further focusing these four light beams into a sample 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 is induced, thus recording a 3D phase hologram on the irradiated portion of the sample.
REFERENCES:
patent: 11-71139 (1999-03-01), None
Toshiaki Kondo et al., “Femtosecond laser interference technique with diffractive beam splitter for fabrication of three-dimensional photonic crystals”, Applied Physics Letters, Aug. 6, 2001, vol. 79, No. 6, pp. 725-727.
Matsuo, “Technique for Producing Photonic Crystals”, Optical and Electro-optical Engineering contact, Aug. 20, 2002, vol. 40, No. 8, pp. 480-489 with English translation.
Toshiaki Kondo et al., “Multiphoton fabrication of periodic structures by multibeam interference of femtosecond pulses”, Applied Physics Letters, Apr. 28, 2003, vol. 82, No. 17, pp. 2758-2760.
Shigeki Matsuo et al., “Fabrication of Three-Dimensional Photonic Crystals by Femtosecond Laser Interference”, Proceedings of SPIE, vol. 4655, 2002, pp. 327-334.
Saulius Juodkazis, “Optical Properties of Femtosecond Irradiated Photo-Thermo-Refractive Glass”, Lithuanian Journal of Physics, vol. 42, No. 2, 119-126 (2002), pp. 1-8.
S. Juodkazis et al., “Three-dimensional recording by femtosecond pulses in dielectrics”, Proceedings of SPIE Reprint, vol. 4977, Jan. 27-30, 2003, pp. 94-107.
Juodkazis Saulius
Kondo Toshiaki
Matsuo Shigeki
Misawa Hiroaki
Amari Alessandro
Japan Science and Technology Agency
Wenderoth , Lind & Ponack, L.L.P.
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