三波耦合的图像

——等离子体中的受激Raman散射，三波耦合：动量与能量守恒

 

强的激烈的光束仿佛一道闪电

射进梦幻的金属核心

顷刻间升起一团紫气

仿佛一只偶然之手推开玫瑰的花丛

 

超快的不仅仅是飞秒脉冲

还有电子那颗狂热的心

多少个温度被抛在身后

灼热的波峰追赶着相对论性的精灵

 

四分之一处临界密度

也临界了女王的神圣

机智时空被强大光压一再地迫击

退守到一点后激起漫天飞舞散射的波纹

 

那些狂乱的电子不再孤单

如漂泊的雨水回归海洋

在光明而温暖的怀抱里

合着心灵的频率深如本性的荡漾

(2008年12月13日草就)

Note1：每周三下午强场物理讨论班，有学生讲等离子体中的受激拉曼散射，有感而发。

等离子体中的受激拉曼散射：入射激光的电磁波与散射电磁波（横波）和电子等离子体Langmiur波（纵波）耦合，多发生在等离子体密度的的1/4处及以下，详见W.L.Kruer书《The Physics of Laser Plasma Interactions》Chapter 7"Stimulated Raman Scattering"

Note2：一般的拉曼散射请参看

Introduction from: http://en.wikipedia.org/wiki/Raman_scattering

Raman scattering or the Raman effect (pronounced: [r?.m?n] —) is the inelastic scattering of a photon. Discovered By Dr. C.V. Raman in liquids and by Grigory Landsberg and Leonid Mandelstam in crystals.

When light is scattered from an atom or molecule, most photons are elastically scattered (Rayleigh scattering). The scattered photons have the same energy (frequency) and wavelength as the incident photons. However, a small fraction of the scattered light (approximately 1 in 10 million photons) is scattered by an excitation, with the scattered photons having a frequency different from, and usually lower than, the frequency of the incident photons.^[1] In a gas, Raman scattering can occur with a change in vibrational, rotational or electronic energy of a molecule (see energy level). Chemists are concerned primarily with the vibrational Raman effect.

In 1922, Indian physicist Chandrasekhara Venkata Raman published his work on the "Molecular Diffraction of Light," the first of a series of investigations with his collaborators which ultimately led to his discovery (on 28 February 1928) of the radiation effect which bears his name. The Raman effect was first reported by C. V. Raman and K. S. Krishnan, and independently by Grigory Landsberg and Leonid Mandelstam, in 1928. Raman received the Nobel Prize in 1930 for his work on the scattering of light. In 1998^[2] the Raman Effect was designated an ACS National Historical Chemical Landmark in recognition of its significance as a tool for analyzing the composition of liquids, gases, and solids.^[3]

Note3：“在Raman之前已经发现此效应的两位苏联科学家也理应获Nobel奖，但由于当时的政治原因， 诺奖只给了Raman一人。”这种说法由中科院理论所的刘寄星研究员提供。

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