20 February 2017 Ultrafast 3D imaging by holography
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Proceedings Volume 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics; 103280H (2017) https://doi.org/10.1117/12.2269568
Event: 31st International Congress on High-Speed Imaging and Photonics, 2016, Osaka, Japan
Abstract
As an ultrafast 3D imaging technique, an improved light-in-flight recording by holography using a femtosecond is presented. To record 3D image of light propagation, a voluminous light-scattering medium is introduced to the light-inflight recording by holography. A mode-locked Ti:Sapphire laser are employed for the optical source. To generate the 3D image of propagating light, a voluminous light-scattering medium is made of gelatin jelly and set in the optical path of the object wave of holography. 3D motion picture of propagation of a femtosecond light pulse was achieved for 260ps with 220fs temporal resolution. Digital recording of 3D image of light propagation is also presented. To record the 3D image of the light propagation, digital holography is combined with the light-in-flight recording by holography using a voluminous light-scattering medium. The hologram is recorded with an image sensor such as CCD image sensor. The image of the light is reconstructed from the digitally recorded hologram by computer. To obtain the motion picture of the 3D image of the light propagation, a set of pieces of holograms consisting of 512 × 512 pixels are extracted from the whole area of the digitally recorded hologram. The position of the extracted piece on the recoded hologram is shifted along the direction in which the reference optical pulse swept on the image sensor, piece-by-piece of the hologram. The set of the pieces are reconstructed sequentially, then the 3D digital motion picture of propagation of femtosecond light pulse is achieved. The recordable time of the motion picture was 60 ps.
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Yasuhiro Awatsuji, Yasuhiro Awatsuji, } "Ultrafast 3D imaging by holography", Proc. SPIE 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics, 103280H (20 February 2017); doi: 10.1117/12.2269568; https://doi.org/10.1117/12.2269568
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