A. S. Grabchikov

Highly efficient source of eye-safe radiation based on KTP optical parametric oscillator

We have constructed, theoretically described and studied characteristics of plane-parallel geometry KTP optical parametric oscillator for conversion Nd:YAG laser radiation into eye- safe region (1.57 micrometers ). 50% conversion efficiency and 12.5 mJ generation energy have been attained.

Direct observation of laser phase changes during solition generation in stimulated raman scattering

carrying out a quantum non-demolition measurement for such a pulse system with coupled modes. For our approach, the non-demolition measurements in both quadratures and in photon number have been analyzed and a suggestion for a multichannel scheme is given as well. In the present paper, the detection of nonclassical light in the real experiment is considered for two types of optical fibers with a spatial beating of the energy between interacting modes: for a periodically inhomogeneous-in-space fiber and for a dual-core tunnelly coupled one. The analysis shows that a good quantum non-demolition measurement is only possible for a strongly squeezed light, and a practically ideal quantum nondemolition measurement could be obtained for such types of optical fibers at relatively low power requirements. The developed approach is also very successful for a study of the problem of generation of quantum states for two coupled solitons. A clear description of the stability domains enlights the existence of instability phenomena, and bifurcations have been obtained in the frames of well-known physical models (e.g., described by the Duffing and/or Mathier equations). We ascertained that a controllable quantum chaos can be identified for a squeezed light in such a system under conditions when the non-demolition measurements take place. The polarized squeezed light has been obtained as well for discussed nonlinear coherent coupling. The Stokes parameters formalism is used for an analysis of polarized chaos in a dual-core optical fiber, and the solution has been written in an exact analytical form. The experimental setup, using the correlation technique, for a verification of such quantum states of light is proposed and the numerical estimations show that the effect can be observed for real conditions.