Journal ArticleDOI
Thermal Dependence of Ruby Laser Emission
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The temperature shift of ruby laser emission has been measured interferometrically for temperatures between 66° and 210°K as mentioned in this paper, and the results were in excellent agreement with calculations by McCumber and Sturge which were based on Raman scattering of Debye model phonons.Abstract:
The temperature shift of ruby laser emission has been measured interferometrically for temperatures between 66° and 210°K Representative values of the temperature shift coefficient are 0004 A/K° at 66°K, 0014 A/K° at 100°K, and 0046 A/K° at 200°K These results are in excellent agreement with calculations by McCumber and Sturge which were based on Raman scattering of Debye‐model phonons The experimental technique for measuring the wavelength shifts is described in detail, and the results are compared with earlier measurements of the temperature dependence of ruby R1 absorption and ruby laser emissionread more
Citations
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Journal ArticleDOI
Dedicated temperature sensing with c-axis oriented single-crystal ruby (Cr/sup 3+/:Al/sub 2/O/sub 3/) fibers: temperature and strain dependences of R-line fluorescence
H.C. Seat,J.H. Sharp +1 more
TL;DR: In this article, single-crystal fibers of ruby (Cr/sup 3+/:Al/sub 2/O/sub 3/) with approximately 0.1 wt.
Journal ArticleDOI
Multi-photon absorption in monatomic gases
Abstract: A theoretical discussion of the ionization of an atom by the simultaneous absorption of many photons is presented. This process may be relevant to the production of plasmas by concentrated beams of intense radiation from lasers. Approximate methods are developed for evaluating the quantum-mechanical expression for the ionization probability. It is shown that the r E form of the interaction Hamiltonian is greatly preferable to the p A form. Comparison of the numerical results with experiment shows that at moderate pressures this process can at best only provide the initiating electron, and the growth of the plasma must then take place by other means, for example inverse bremsstrahlung. Even to sustain this argument it is necessary to assume that the radiation is normally incoherent, and the role of inhomogeneities in increasing the overall ionization probability is stressed. At low pressures, where the second process is inhibited, better agreement is found. Finally, the enhancement of the ionization probability which occurs when a natural atomic level lies close to an integral number of photon energies above the ground state is illustrated by a specific example (lithium). A fourfold drop in the threshold flux for ionization is predicted when a ruby laser is tuned through such a resonance.
Journal ArticleDOI
High resolution spectroscopy with lasers
TL;DR: In this paper, a review of recent applications of lasers in high-resolution spectroscopy including methods with high spectral- or high time-resolution is given, followed by a short survey about the characteristic features of lasers important for spectroscopic research, some examples are discussed where lasers were used in molecular emission and absorption-spectroscopy.
Journal ArticleDOI
Multiphoton ionization of neon: experimental study of a resonance
TL;DR: By focusing a laser beam in neon, the authors experimentally study the validity of several multiphoton ionization theories by varying the energy of the emitted photons, and show that the results are valid.
References
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Journal ArticleDOI
Linewidth and Temperature Shift of the R Lines in Ruby
D. E. McCumber,M. D. Sturge +1 more
TL;DR: Improved experimental data have been obtained between 20° and 350°K for the widths and temperature shifts of the R lines in ruby as mentioned in this paper, which can be accurately described in terms of Raman scattering of Debye-model phonons.
Journal ArticleDOI
Relation between Absorption and Emission in the Region of the R Lines of Ruby
D. F. Nelson,M. D. Sturge +1 more
TL;DR: In this article, the authors measured the radiative efficiency and absorption cross sections for the $R$ lines of dilute ruby, as a function of polarization and temperature between 20 and 373\ifmmode^\circ\else\text degree\fi{}K.
Journal ArticleDOI
Absorption Spectra of Cr3+ in Al2O3 Part B. Experimental Studies of the Zeeman Effect and Other Properties of the Line Spectra
Satoru Sugano,Ikuji Tsujikawa +1 more
TL;DR: In this paper, the absorption intensities, widths and wave numbers of R 1, R 2 and B 1 B 2 lines of Cr 3+ in ruby for the polarized light E ⊥ C 3 and E // C 3 are experimentally studied at 20°K and 4.2°K.