By Harald Friedrich, Bruno Eckhardt

ISBN-10: 354063004X

ISBN-13: 9783540630043

During this booklet, many of the world's prime researchers in quantum, classical and atomic physics cooperate to give an up to date account of the hot development within the box. the 1st half highlights the newest advances in semiclassical thought, while the second is dedicated to functions to atomic structures. The authors current the fabric in pedagogical shape to make it effortless analyzing for non-specialists, too. one of the subject matters taken care of, the reader will discover a new quasiclassical quantization scheme for Hamiltonian dynamics, an program of the semiclassical formalism to photodissociation of small molecules and to the Lorentz fuel and discussions of tunneling corrections. in addition, one reveals papers on chaotic ionization, at the behaviour of hydrogen atoms in exterior fields, e.g. magnetic or microwave fields.

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Sample text

Intracavity absorption cells are particularly advantageous if the absorption is monitored via the laser-induced fluorescence. Since the radiation field inside the active resonator or inside the mode-matched passive cavity is concentrated within the region of the Gaussian beam (Vol. 1, Sect. 9), the laser-excited fluorescence can be effectively imaged onto the entrance slit of a spectrometer with a larger efficiency than in the commonly used multipass cells. If minute concentrations of an absorbing component have to be selectively detected in the presence of other constituents with overlapping absorption lines but different fluorescence spectra, the use of a spectrometer for dispersing the fluorescence can solve the problem.

However, there also exist some drawbacks: the cavity length has to be changed synchronously with the tunable-laser wavelength in order to keep the external cavity always in resonance. Furthermore, one has to take care to prevent optical feedback from the passive to the active cavity, which would cause a coupling of both cavities with resulting instabilities. This feedback can be avoided by an optical diode (Vol. 1, Sect. 7). (2) Another way of detecting intracavity absorption with a very high sensitivity relies on the dependence of the single-mode laser output power on absorption losses inside the laser resonator (detector 2 in Fig.

The saturated gain gs = 2L 1 αs depends on the intracavity intensity I. 61) in Vol. 16) where Is is the saturation intensity. The gain decreases from g0 for P = 0 to gs = g0 /2 for P = Ps (Vol. 1, Sect. 6). At a constant pump power, the laser power P stabilizes itself at the value where gs = γ . 16), this gives: P = Ps g0 − γ . 17) If small additional losses Δγ are introduced by the absorbing sample inside the cavity, the laser power drops to a value Pα = P − ΔP = Ps · g0 − γ − Δγ . 19) where g0 is the unsaturated gain.

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