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By Professor Dr. Wolfgang Demtröder (auth.)

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A wave emitted from a point source with the spectral width ~w can be regarded as a superposition of many quasi-monochromatic components with frequencies wn within the interval ~w. 1). If the path difference ~s in the Michelson interferometer becomes larger than ~sc, the split wave trains no longer overlap in the plane B. 23a,b. w. 8 a) A low-pressure mercury spectral lamp with a spectral filter which only transmits the green line >. sc ~ 8 em. v = I MHz has a coherence length of about 50 m. 2. 23a).

3 a) In the thermal radiation field of a 100 W light bulb, 10 em away from the tungsten wire, the number of photons per mode at >. = 500 nm is about I0- 8 . If a molecular probe is placed in this field, the induced emission is therefore completely negligible. b) In the center spot of a high-current mercury discharge lamp with very high pressure the number of photons per mode is about IQ-2 at the center frequency of the strongest emission line at >. 6 mm. This shows that even in this very bright light source the induced emission only plays a minor role.

2. 3 give values of ii for different conditions. The mean number ii of photons per mode is often called the degeneracy parameter of the radiation field. This example shows that the coherence volume is related to the modes of the radiation field. ;b around the direction of k. 2 lb 2. 9Ic) which limits the spatial coherence. , they may have different frequencies w. wlc of the k values. 24. 93). We shall now demonstrate that the coherence volume is identical with the spatial part of the elementary cell in the general phase space.

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