File:Perpetualmo.jpg
Curves of the effective emission and absorption cross-section suggested by [1] presented in the scientific journal Applied Physics letters. The maximum of absorption corresponds to almost zero of emission. Such a property is not compatible with the Second law of thermodynamics and makes such a medium suitable material for the perpetual motion machine of the second kind. This extraordinary property of $\rm Yb : Gd_2 Si O_5$ ceramics was confirmed also in the publications at the journals Optics Express [2] and Solid State communications[3]. Using the McCumber_relation [4][5] the correction of the emission had been suggested and the claim for such a revolutionary behavior of the cross-sections had beed withdrawn; see article McCumber_relation for the details and the additional references.
References
- ↑ W.Li, H.Pan, L.Ding, H.Zeng, W.Lu, G.Zhao, C.Yan, L.Su, J. Xu. Efficient diode-pumped $\rm Yb : Gd_2 Si O_5$ laser. Appl. Phys. Lett. 88, 221117 (2006).
- ↑ W.Li, H.Pan, L.Ding, H.Zeng, G.Zhao, C.Yan, L.Su, J.Xu. Diode-pumped continuous-wave and passively mode-locked Yb : Gd2SiO5 laser. – Optics Express 14, 686-695 (2006)
- ↑ C.Yan, G.Zhao, L.Zhang, J.Xu, X.Liang, D.Juan, W.Li, H.Pan, L.Ding, H.Zeng. A new Yb- doped oxyorthosilicate laser crystal: Yb : Gd2SiO5 . – Solid State Comm.137, 451-455 (2006)
- ↑ D.E.McCumber, Einstein relations connecting broadband emission and absorption spectra. – Phys.Rev. 136 (4A), 954-957 (1964)
- ↑ P.C.Becker, N.A.Olson, J.R.Simpson. Erbium-doped fiber amplifiers: fundamentals and theory. – Academic, 1999.
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