...To explain the intensity distribution of diffraction using a vertically long aperture as an example, the brightest part in the center is where the light from all parts of the aperture is superimposed with almost the same phase, the first dark part is where the optical path difference of the light from two points on the aperture separated by half the length of the aperture is half a wavelength, and the light from the upper half of the aperture and the light from the lower half interfere and disappear, and the second bright part is where the aperture is divided into three equal parts, the light passing through two of them interferes and cancels out, and the light intensity is determined by the light passing through the remaining one. A hologram is a pattern created by superimposing a parallel light that interferes well with the Fresnel diffracted wave by an object and recording it on a photographic plate. When parallel light is incident on a hologram, in addition to the transmitted light that goes straight, the Fresnel diffracted wave mentioned above is produced. ... *Some of the terminology explanations that mention "horogram" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…たてに長い開口を例にとって回折の強度分布を説明すると,中心のもっとも明るい部分は開口のすべての部分からの光がほとんど同じ位相で重ね合わされたところ,最初の暗部は開口の長さの半分だけ離れた開口上の2点からの光の光路差が半波長で,開口の上半分からの光と,下半分からの光とが干渉して消えてしまうところであり,第2の明るい部分は開口を三等分して,そのうちの二つを通る光が干渉して消し合い,残り一つを通る光で光の強度が決まるところである。 物体によるフレネルの回折波に,この光とよく干渉する平行光を参照光として重ね合わせて干渉縞を作り,写真乾板に記録したものをホログラムhorogramという。ホログラムに平行光を入射すると,直進する透過光のほかに,先ほどのフレネルの回折波が出てくる。… ※「horogram」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
<<: hōrologion (English spelling)
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