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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Raman cooling ： ウィキペディア英語版 Raman cooling In atomic physics, Raman cooling is a sub-recoil cooling technique that allows the cooling of atoms using optical methods below the limitations of Doppler cooling, limited by the recoil energy of a photon given to an atom. This scheme can be performed in simple optical molasses or in molasses where an optical lattice has been superimposed, which are called respectively free space Raman cooling 〔(''Laser cooling below photon recoil with three-level atoms'' ), Mark Kasevich, Steven Chu, Phys. Rev. Lett. 69, 1741 (1992)〕 and Raman side-band cooling.〔(''Beyond Optical Molasses: 3D Raman Sideband Cooling of Atomic Cesium to High Phase-Space Density'' ), Andrew J. Kerman, Vladan Vuletic, Cheng Chin, and Steven Chu, Phys. Rev. Lett. 84, 439 (2000)〕 Both techniques make use of Raman scattering of laser light by the atoms. ==Two photon Raman process== The transition between two hyperfine states of the atom can be triggered by two laser beams: the first beam excites the atom to a virtual excited state (for example because its frequency is lower than the real transition frequency), and the second beam deexcites the atom to the other hyperfine level. The frequency difference of the two beams is exactly equal to the transition frequency between the two hyperfine levels. The illustration of this process is shown in the schematic illustration of a two-photon Raman process. It enables the transition between the two levels $|g\_1\backslash rangle$ and $|g\_2\backslash rangle$. The intermediate, virtual level is represented by the dashed line, and is red-detuned with respect to the real excited level, $|e\backslash rangle$. The frequency difference $f\_2-f\_1$ here matches exactly the energy difference between $|g\_1\backslash rangle$ and $|g\_2\backslash rangle$. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Raman cooling」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.