Difficulties associated with stimulated emission on a titanium atom self-terminating transitions

Vladimir A. Kelman; Yurij V. Zhmenyak; Andrij S. Rybak; Yuriy O. Shpenik

doi:10.1117/12.384299

4 May 2000 Difficulties associated with stimulated emission on a titanium atom self-terminating transitions

Vladimir A. Kelman, Yurij V. Zhmenyak, Andrij S. Rybak, Yuriy O. Shpenik

Proceedings Volume 3931, Gas, Chemical, and Electrical Lasers and Intense Beam Control and Applications; (2000) https://doi.org/10.1117/12.384299
Event: Symposium on High-Power Lasers and Applications, 2000, San Jose, CA, United States

Abstract

A large progress was achieved during the 34 years period of development of the lasers on self-terminating transitions (STT) from the upper resonant to the lower metastable levels. The number of obtained laser lines on STT in atomic and ionic spectra is not less than 44. The parameters of the lasers are also impressive. An average power of 201 W with efficiency of 1.9 percent was achieved in the Cu-vapor of the so-called HyBrID laser. At the same time no effective lasers on STT in the blue spectra were developed. In the combination with the green Cu-vapor and the red Au-vapor lasers an effective blue laser can be useful to the elaboration of the color optical projection system that amplifies the brightness of images. The Bi-vapor and the Fe- vapor blue lasers tested until now do not satisfy the average power and efficiency requirements. We have suggested the titanium atom to obtain laser oscillation o several STT in the blue-green spectral region that fully satisfy the Gould criteria for efficient lasers on STT. An additional stimulus was that the laser oscillation on the above- mentioned transitions was achieved by N₂-laser pumping of the titanium vapor. We provided the calculations of the kinetics of excitation and ionization of titanium atoms in saturated power approximation which clearly shows the population inversion at least on two TiI STT. The extremely low pressure of the saturated Ti vapor at acceptable temperatures strongly prevents the practical use of pure Ti vapor for the STT laser. To solve the problem of Ti laser on STT we had to undertake three different methods to obtain Ti atoms in the discharge: a) the principal experiments with exposed Ti-wire might answer on the question of perspective of Ti atom for the STT laser; b) the experiments including the process known as 'iodine method of rectification'; c) the cathode sputtering of titanium cathode in the hollow- cathode discharge. Nevertheless, lasing action had not yet been achieved but all the three methods are now in progress to elaborate the blue Ti-vapor laser on STT.

Citation Download Citation

Vladimir A. Kelman, Yurij V. Zhmenyak, Andrij S. Rybak, and Yuriy O. Shpenik "Difficulties associated with stimulated emission on a titanium atom self-terminating transitions", Proc. SPIE 3931, Gas, Chemical, and Electrical Lasers and Intense Beam Control and Applications, (4 May 2000); https://doi.org/10.1117/12.384299

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