Lasing without inversion due to parametric instability of the laser near the exceptional point

I. V. Doronin, A. A. Zyablovsky , E. S. Andrianov, A. A. Pukhov, and  A. P. Vinogradov

Reference

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[4] B. Bagchi, C. Quesne, and M. Znojil, Mod. Phys. Lett. A 16, 2047 (2001).