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Optics Communications

Narrowing of spectral lines beyond the natural or dephasing line width

Wolfgang Zinth, Martin C. Nuss, W. Kaiser

Published Jan 1, 1983• 19 citations
Publisher
DOI
10.1016/0030-4018(83)90134-7

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These results suggest that the natural width of a spectral line may be less than the value to be expected from the classical theory of damping by radiation.The subject of width of spectral line is one of considerable importance.If the lines are really much narrower than 0.12 X-Unit the radiation can- not come from a damped oscillating electron.The mechanism must be such as to maintain a pure harmonic oscillation of constant amplitude until the quantum of energy is completely emitted.Such a train of waves would need to have a great number of elements and so have considerable length.An alternate hypothesis would be that a quantum is an entity (the word "pulse" is avoided) that may be resolved into a train of waves by the crystal grating.In this case the width of a spectral line would de- pend on the degree of perfection of the crystal.The quantum theory of crystal grating action advanced by Duane8 might also give a narrow spec- tral line, whose width would be a property of the crystal grating and not of the radiation.

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We show that ultrasharp spectral lines, with widths 2 orders of magnitude below the natural width, may be produced in the resonance fluorescence of a V-type three-level atom excited by a single-mode laser field when the dipole moments are nearly parallel. The smaller the splitting of the excited doublet, the narrower the line. This effect is due to quantum interference between the two transition pathways.

Physical Review Letters•Nov 4, 1996•323 citations
These results suggest that the natural width of a spectral line may be less than the value to be expected from the classical theory of damping by radiation.The subject of width of spectral line is one of considerable importance.If the lines are really much narrower than 0.12 X-Unit the radiation can- not come from a damped oscillating electron.The mechanism must be such as to maintain a pure harmonic oscillation of constant amplitude until the quantum of energy is completely emitted.Such a train of waves would need to have a great number of elements and so have considerable length.An alternate hypothesis would be that a quantum is an entity (the word "pulse" is avoided) that may be resolved into a train of waves by the crystal grating.In this case the width of a spectral line would de- pend on the degree of perfection of the crystal.The quantum theory of crystal grating action advanced by Duane8 might also give a narrow spec- tral line, whose width would be a property of the crystal grating and not of the radiation.