Volume 67, Number 6, September 2004
|Page(s)||948 - 954|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 September 2004|
Giant lasing effect in magnetic nanoconductors
Department of Microelectronics and Nanoscience, Chalmers University of Technology SE-412 96 Göteborg, Sweden
2 Department of Applied Physics, Chalmers University of Technology and Göteborg University - SE-412 96 Göteborg, Sweden
3 Theoretische Physik III, Ruhr-Universität Bochum - D-44780 Bochum, Germany
Corresponding author: email@example.com
Accepted: 27 July 2004
We propose a new principle for a compact solid-state laser in the 1–100 regime. This is a frequency range where attempts to fabricate small-size lasers up to now have met severe technical problems. The proposed laser is based on a new mechanism for creating spin-flip processes in ferromagnetic conductors. The mechanism is due to the interaction of light with conduction electrons; the interaction strength, being proportional to the large exchange energy, exceeds the Zeeman interaction by orders of magnitude. On the basis of this interaction, a giant lasing effect is predicted in a system where a population inversion has been created by tunneling injection of spin-polarized electrons from one ferromagnetic conductor to another —the magnetization of the two ferromagnets having different orientations. Using experimental data for ferromagnetic manganese perovskites with nearly 100% spin polarization, we show the laser frequency to be in the range 1–100. The optical gain is estimated to be of order 107, which exceeds the gain of conventional semiconductor lasers by 3 or 4 orders of magnitude. A relevant experimental study is proposed and discussed.
PACS: 42.55.Ah – General laser theory / 42.55.Rz – Doped-insulator lasers and other solid state lasers / 73.63.Rt – Nanoscale contacts
© EDP Sciences, 2004
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