By Martin R. S. McCoustra (auth.), David L. Andrews, Andrey A. Demidov (eds.)
In the recent variation the editors have preserved the elemental suggestion and constitution, with the involvement of a few new authors - all well-known specialists in laser spectroscopy. each one bankruptcy addresses a distinct method, delivering a evaluate and research of the present prestige, and reporting a few of the most recent achievements. With the main formulation and strategies designated in lots of sections, this article represents a manageable instruction manual of its topic. will probably be a precious software either for experts to maintain abreast of advancements and for novices to the sector desiring an obtainable creation to precise tools of laser spectroscopy - and likewise as a source for fundamental references.
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Additional resources for An Introduction to Laser Spectroscopy: Second Edition
3 -i: . ,. u < n :; .... c u § 1; ~ 1000 10 .. 8 o x Figure J2. Dependence of the laser emission wavelength on composition, at a temperature of \0 K, for Pb salts of various alloy compositions. ] A relatively recent development in diode laser technology promises much as an IR source. , 1994) contrasts markedly with lead salt devices. Constructed as a multiple quantum well device from wide bandgap III-V materials, laser action is engineered to occur between energy levels located entirely within the conduction band of the semiconductor.
Principles ofAbsorption and Fluorescence 47 (absorption coefficient) and calculable (dipole-, or oscillator- strength) measures of the transition strength. Eq. 2 provides a convenient starting point, since BI2 is directly proportional to the intrinsic absorptivity of the atom or molecule undergoing excitation (Eq. 4). Following Atkins (1983), the differential loss of intensity of radiation of frequency v due to an absorbing species with transition energy hv is directly proportional to the number density of species NI(v) in the initial state 11) that are capable of absorbing radiation at the frequency v, the radiation density, p(v), at this frequency and the differential pathlength 8i: (11) This equation can be related to an operational quantity, the observed loss of intensity due to absorption by a sample of the atoms or molecules of interest: -8/ =K(v)/C8e, (12) where K(V) is the molar Napierian absorption coefficient (units m2 mot l ) and C the concentration.
Schematic representation of a device using multiple fixed Fabry-Perot interferometers, as used for laser wavelength measurement (Cotnoir, 1989). [Copyright Penwell Corporation, 1989. ] Such devices have comparable accuracy (1 part in 106) to other interfero metric methods, although they are somewhat simpler in construction. Microscope Objective Input \ Beam Fizeau Wedge "- Detector Array Compensating /C I' dl'a1 Plate yin ne Lens Figure 23. Schematic representation of a device using a Fizeau interferometer, as used for laser wavelength measurement (Cotnoir, 1989).
An Introduction to Laser Spectroscopy: Second Edition by Martin R. S. McCoustra (auth.), David L. Andrews, Andrey A. Demidov (eds.)