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This is a part of an overview of my early studies on nonlinear spin-phonondynamics in solid state optical-wavelength phonon lasers (phasers) started in1984. The main goal of this work is a short description and a qualitativeanalysis of experimental data on low-frequency nonlinear resonances revealed ina nonautonomous ruby phaser. Under phaser pumping modulation near theseresonances, an unusual kind of self-organized motions in the ruby spin-phononsystem was observed by me in 1984 for the first time. The original technique ofoptical-wavelength microwave-frequency acoustic stimulated emission (SE)detection and microwave-frequency power spectra (MFPS) analysis was used inthese experiments (description of the technique see: D.N.Makovetskii, Cand.Sci. Diss., Kharkov, 1983). The real time evolution of MFPS was studied usingthis technique at scales up to several hours. The phenomenon of theself-organized periodic alternation of SE phonon modes was experimentallyrevealed at hyperlow frequencies from about 0.1 Hz to 0.001 Hz and less (forthe phaser pumping modulation at approximately 10 Hz). The nature of thisphenomenon was investigated by me later in details (see:arXiv:cond-mat/0303188v1 ; arXiv:cond-mat/0410460v1 ; Tech. Phys. Letters,2001, Vol.27, No.6, P.511-514 ; Tech. Phys., 2004, Vol.49, No.2, P.224-231).

Dynamical Phenomena in an Optical-Wavelength Phonon Laser (Phaser): Nonlinear Resonances and Self-Organized Mode Alternation