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Over 10 years pass after experimental discovery Josephson plasma resonance (JPR) in high-T_c superconductors. JPR spectroscopy became the powerful tool to study vortex phase diagram and interlayer electrodynamics in Josephson coupled layered superconductors like certain of high-T_c cuprates and molecular superconductors. We describe main principles of the JPR spectroscopy for measurement longitudinal plasma oscillations at the fundamental frequency ω_p. That frequency and linewidth of resonance is directly related to the interlayer phase coherence. In this paper we report about developments and achievments in spectroscopy of JPR. The study of the vortex state of Bi₂Sr₂CaCu₂O_8+δ and c-axis electrodynamics of Bi₂Sr₂CaCu₂O_8+δ and Bi₂Sr₂CuO_6+δw in zero magnetic field by JPR.

Over 10 years pass after experimental discovery Josephson plasma resonance (JPR) in high-T_c superconductors. JPR spectroscopy became the powerful tool to study vortex phase diagram and interlayer electrodynamics in Josephson coupled layered superconductors like certain of high-T_c cuprates and molecular superconductors. We describe main principles of the JPR spectroscopy for measurement longitudinal plasma oscillations at the fundamental frequency ω_p. That frequency and linewidth of resonance is directly related to the interlayer phase coherence. In this paper we report about developments and achievments in spectroscopy of JPR. The study of the vortex state of Bi₂Sr₂CaCu₂O_8+δ and c-axis electrodynamics of Bi₂Sr₂CaCu₂O_8+δ and Bi₂Sr₂CuO_6+δw in zero magnetic field by JPR.