Astrophysical lasers by Vladilen Letokhov, Sveneric Johansson

By Vladilen Letokhov, Sveneric Johansson

Development in sleek radio astronomy resulted in the invention of area masers within the microwave diversity, and it grew to become a robust software for stories of interstellar star-forming molecular clouds. development in observational astronomy, really with ground-based large telescopes and the space-based Hubble house Telescope, has resulted in contemporary discoveries of house lasers within the optical variety. those function in fuel condensations within the neighborhood of the mysterious big name Eta Carinae (one of the main luminous and big stars of our Galaxy). either maser and laser results, first proven below laboratory stipulations, have now been came upon to happen less than average stipulations in area, too. This ebook describes always the weather of laser technology, astrophysical plasmas, sleek astronomical statement innovations, and the basics and homes of astrophysical lasers. A e-book with such an interdisciplinary scope has no longer been to be had to this point. The e-book can also be precious for a much wider viewers drawn to smooth advancements of the normal sciences and expertise.

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To describe how the profile of an observed absorption line depends on the optical density τ0 , the so-called curve-of-growth is used in astrophysics. Since the details of this curve used for quantitative analysis of stellar spectral lines (Greenstein, 1960; Emerson, 1996) are not essential for us, we shall restrict ourselves to the qualitative growth pattern shown in Fig. 9. The vertical axis in Fig. 5 x 0 –3 (b) –2 0 –1 1 2 3 v–v0 x= dvD Absorption 1 D t0 = 2 Absorption on wings t0 = 100 0 –3 –2 –1 0 1 2 3 v–v0 x= dvD Fig.

An isolated atom cannot transfer the excess (or acquire the shortage) of its energy (ω − ω0 ). An atom can enter an excited state only in a two-photon absorption process (absorption of two photons simultaneously) with reemission of one photon with the frequency ω = 2ω − ω0 (Makarov, 1983). When a γ, the atom scatters photon is absorbed with the frequency ω such that |ω − ω0 | the photon but remains excited virtually for a very short time 1/ |ω − ω0 |. It is evident that, in the case of a non-isolated atom interacting with other particles (reservoir), the excitation of the atom becomes possible.

The cross-section of resonance scattering from these slow atoms, with |ω − ω0 | δωD , is determined by radiative decay because the Lorentz profile in a wing is much more intense than the Doppler profile. 58). The same considerations, as illustrated in Fig. 6, are valid for the resonance absorption cross-section σabs (ω) as well. We shall make use of them below when discussing optically dense media. The frequency redistribution at resonance scattering is essential when explaining the profile of spectral lines in stellar atmospheres (Mihalas, 1978).

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