S.V. Popov

Susceptibility tensors for nonlinear optics

PREFACE TURBO-RANK PACKAGE INTRODUCTION TO THE THEORY OF NONLINEAR SUSCEPTIBILITIES Optical response of the medium Various forms of the constitutive equation Nonlinear optical response Absorptionless media Tensors of nonlinear optical susceptibilities PROPERTIES OF THE TENSORS OF LOCAL AND NONLOCAL OPTICAL RESPONSE Linear optical susceptibilities Quadratic optical susceptibilities Cubic optical susceptibilities Higher-order nonlinear susceptibilities Selected results of quantum theory PRINCIPLES OF CALCULATION OF SYMMETRY PROPERTIES OF HIGH-RANK MATERIAL TENSORS Material tensors Basic concepts Crystal symmetry classes and natural system of coordinates Equations of invariance of material tensors Method of direct inspection and its algorithmization Method of cyclic coordinates and its algorithmization IMPLICIT CONSTITUTIVE EQUATIONS Optical response and causality principle Implicit constitutive equations in oscillator models APPENDICES Susceptibility tensors for principal nonlinear optical processes Units for optical susceptibilities Principle of symmetry of kinetic coefficients and optical susceptibilities Material tensors for isotropic media Tables of third-, fourth- and fifth-rank tensors REFERENCES

Cubic optical nonlinearity of free electrons in bulk gold

A fast (Tau(response) <90 fs) free-electron spin-f lipping frequency-degenerate nonlinearity with a signif icant value of|chi((3))(xxyy)(omega,omega,omega,-omega)chi((3))(xxyy)(omega,omega,omega,-omega)|~10(-)(8)esu has been observed in bulk gold at 1260 nm by use of a new pump-probe polarization-sensitive technique.

Coherent and incoherent specular inverse faraday-effect - chi((3)) measurements in opaque materials

We report what is to our knowledge the first observation of coherent and incoherent terms of the specular inverse Faraday effect. The specular inverse Faraday effect is treated as a four-wave mixing phenomenon, and the role of the phase-conjugated wave in the polarization-altering interaction is disclosed. Several components of the nonresonant cubic susceptibility tensor in InSb and GaAs are measured and found to be in the 10(-7)-10(-6)-esu range.

Femtosecond optical nonlinearity of metallic indium across the solid–liquid transition

A very strong (~10(-8) esu) femtosecond cubic nonlinearity in metallic indium that increased sharply in magnitude as the temperature approached the melting point was observed.

Pump-probe reflective polarization-sensitive nonlinear optics

We report on the phenomenological theory of frequency degenerate pump–probe polarization-sensitive wave interactions at the boundary with a nonlinear medium. We consider media with local and nonlocal optical responses. The general analytical solutions for polarization-plane azimuth rotation and ellipticity of the transmitted and reflected probe waves are obtained. It is found that the pump-intensity-dependent change of the polarization state of transmitted and reflected probe waves has coherent and incoherent contributions. Nonlinear polarization phenomena of the specular inverse Faraday effect, the specular optical Kerr effect, the specular nonlinear anisotropic effect, specular nonlinear optical activity, and specular nonlinear nonlocal birefringence are discussed.

Time non-invariant linear birefringence and dichroism due to spin—orbit interaction

Evidence of time-nonreversible nonreciprocal linear birefringence and dichroism has been observed in a GaAs crystal in experiments in transmission and reflection. Time-nonreversibility is treated in terms of the quantum theory of nonlocal optical response, revealing the role of the spin-orbit interaction.

Direct measurement of carrier spin relaxation times in opaque solids using the specular inverse Faraday effect

Abstract Using a spectroscopic technique based on the transient specular inverse Faraday effect (SIFE) we found the electron spin relaxation time in bulk GaAs at room temperature to be 11 ± 1 ps. The hole spin dynamics gives a SIFE signal of the opposite sign and may be resolved in the time-domain.

Coherent and incoherent specular inverse Faraday effect in YBa2Cu3O7–δ

Abstract Observation of coherent and incoherent terms of the Specular Inverse Faraday Effect (SIFE) in YBa2Cu3O7−δ is reported. The spectroscopic potential of measurements of the coherent and incoherent terms of SIFE is revealed and two components of nonresonant cubic susceptibility tensor in this superconducting material are measured and found to be in 10-9-10-8 esu range.

Specular nonlinear anisotropic polarization effect along fourfold crystal symmetry axes

We present what is to our knowledge the first experimental observation of the specular nonlinear anisotropic polarization effect of a pump-induced polarization-plane rotation for normal-incidence reflection from the (001) surface of a cubic crystal. In GaAs, azimuth rotation of the order of 9 × 10−6 rad is seen for a pump intensity of 75 MW/cm−2 at 750 nm, from which the anisotropic component of the cubic nonlinearity |Re(χxxxx − 2χxxyy − χxyyx )| = 5 × 10−9 esu is found.

Transient optical excitation breaks time-reversibility in GaAs and InSb crystals

Intense picosecond optical excitation of GaAs and InSb crystals induces specular polarization azimuth rotation for a probe beam normally reflected from the (001) surface. The effect may be interpreted as manifestation of a transient time-non-reversible state.