Wolfgang Demtröder

Bio: Wolfgang Demtröder is an academic researcher from Kaiserslautern University of Technology. The author has contributed to research in topics: Spectroscopy & Laser. The author has an hindex of 9, co-authored 35 publications receiving 1253 citations.

Laser Spectroscopy: Basic Concepts and Instrumentation

Abstract: Introduction.- Absorption and Emission of Light.- Widths and Profiles of Spectral Lines.- Spectroscopic Instrumentation.- Lasers as Spectroscopic Light Sources.- Doppler-Limited Absorption and Fluorescence Spectroscopy with Lasers.- Nonlinear Spectroscopy.- Laser Raman Spectroscopy.- Laser Spectroscopy in Molecular Beams.- Optical Pumping and Double-Resonance Techniques.- Time-Resolved Laser Spectroscopy.- Coherent Spectroscopy.- Laser Spectroscopy of Collision Processes.- New Developments in Laser Spectroscopy.- Applications of Laser Spectroscopy.- References.- Index.

Atoms, Molecules and Photons: An Introduction to Atomic-, Molecular- and Quantum Physics

Abstract: Introduction.- Evolution of the atom model.- Evolution of quantum physics.- Fundamentals of quantum mechanics.- The hydrogen atom.- Atoms with several electrons.- Emission and absorption of electromagnetic radiation.- Laser.- Molecules.- Experimental methods in atomic- and molecular physics.- Structure of condensed matter.- Dynamics of crystal lattice.- Electrons in condensed matter.- Semiconductors.- Dielectric and optical properties of condensed matter.- Amorphous solid state matter, liquids, liquid crystals and cluster.- Surfaces.

Molecular Physics: Theoretical Principles and Experimental Methods

Abstract: Preface 1 Introduction 2 Molecules Electronic States 3 Rotation, Vibration, and Potential Curves of Diatomic Molecules 4 Spectra of Diatomic Molecules 5 Molecule Symmetries and Group Theory 6 Rotation and Vibrations of Polyatomic Molecules 7 Electronic States of Polyatomic Molecules 8 Spectra of Polyatomic Molecules 9 Breakdown of the Born-Oppenheimer-Approximation, Perturbations in Molecular Spectra 10 Molecules in External Fields 11 Van der Waals Molecules and Clusters 12 Experimental Techniques in Molecular Physics Appendix: Charcter Tables of Some Point Groups Bibliography Index

Photonic crystals

Abstract: The term photonic crystals appears because of the analogy between electron waves in crystals and the light waves in artificial periodic dielectric structures. During the recent years the investigation of one-, two-and three-dimensional periodic structures has attracted a widespread attention of the world optics community because of great potentiality of such structures in advanced applied optical fields. The interest in periodic structures has been stimulated by the fast development of semiconductor technology that now allows the fabrication of artificial structures, whose period is comparable with the wavelength of light in the visible and infrared ranges.

The Quantum Theory of Light

Abstract: (b) Write out the equations for the time dependence of ρ11, ρ22, ρ12 and ρ21 assuming that a light field interaction V = -μ12Ee iωt + c.c. couples only levels |1> and |2>, and that the excited levels exhibit spontaneous decay. (8 marks) (c) Under steady-state conditions, find the ratio of populations in states |2> and |3>. (3 marks) (d) Find the slowly varying amplitude ̃ ρ 12 of the polarization ρ12 = ̃ ρ 12e iωt . (6 marks) (e) In the limiting case that no decay is possible from intermediate level |3>, what is the ground state population ρ11(∞)? (2 marks) 2. (15 marks total) In a 2-level atom system subjected to a strong field, dressed states are created in the form |D1(n)> = sin θ |1,n> + cos θ |2,n-1> |D2(n)> = cos θ |1,n> sin θ |2,n-1>

Observation of squeezed states generated by four-wave mixing in an optical cavity

Abstract: Squeezed states of the electromagnetic field have been generated by nondegenerate four-wave mixing due to Na atoms in an optical cavity. The optical noise in the cavity, comprised of primarily vacuum fluctuations and a small component of spontaneous emission from the pumped Na atoms, is amplified in one quadrature of the optical field and deamplified in the other quadrature. These quadrature components are measured with a balanced homodyne detector. The total noise level in the deamplified quadrature drops below the vacuum noise level.

Resonant nonlinear magneto-optical effects in atoms

Abstract: The authors review the history, current status, physical mechanisms, experimental methods, and applications of nonlinear magneto-optical effects in atomic vapors. They begin by describing the pioneering work of Macaluso and Corbino over a century ago on linear magneto-optical effects (in which the properties of the medium do not depend on the light power) in the vicinity of atomic resonances. These effects are then contrasted with various nonlinear magneto-optical phenomena that have been studied both theoretically and experimentally since the late 1960s. In recent years, the field of nonlinear magneto-optics has experienced a revival of interest that has led to a number of developments, including the observation of ultranarrow (1-Hz) magneto-optical resonances, applications in sensitive magnetometry, nonlinear magneto-optical tomography, and the possibility of a search for parity- and time-reversal-invariance violation in atoms.