R. W. Terhune

Bio: R. W. Terhune is an academic researcher from Ford Motor Company. The author has contributed to research in topics: Linear polarization & Circular polarization. The author has an hindex of 3, co-authored 3 publications receiving 1200 citations.

Study of Optical Effects Due to an Induced Polarization Third Order in the Electric Field Strength

Abstract: This paper presents the results of a series of experiments in which a giant pulsed ruby laser is used to study several different nonlinear optical effects arising from an induced optical polarization third order in the electric field strength. The various phenomena studied are special cases of either frequency mixing or intensity-dependent changes in the complex refractive index, including Raman laser action at a focus. A wide range of crystalline and isotropic materials was studied. The theory for these effects is extended to cover resonant interactions. The experimental results are interpreted in terms of simplified models, and quantitative values for the nonlinear polarizability coefficients are given. The rather large experimental uncertainties in these coefficients are discussed.

Mechanisms of Double Resonance in Solids

Abstract: A study of electron-nuclear double resonance (ENDOR) in ruby and other solids demonstrates the existence of the "distant-ENDOR" effect, which involves a change in the electron paramagnetic resonance (EPR) signal caused by the depolarization of "distant" nuclei (nuclei having negligible hyperfine interaction with the paramagnetic centers). In order to obtain interpretable data on the mechanism, it proved necessary to perform most of the experiments without modulation, observing not the derivatives but the functions ${\ensuremath{\chi}}^{\ensuremath{'}}$ and ${\ensuremath{\chi}}^{\ensuremath{'}\ensuremath{'}}$ themselves, the dispersive and absorptive parts of the spin susceptibility. The former shows a large decrease upon application of rf power at a nuclear transition frequency; the latter shows a moderate increase. Both the distant ENDOR (${\mathrm{Al}}^{27}$ nuclear Zeeman frequencies) and local ENDOR (${\mathrm{Cr}}^{53}$ hyperfine frequencies) affect the EPR with a response time comparable to the spin-lattice relaxation time of the distant aluminum nuclei. Nuclear-nuclear double-resonance experiments show that applied rf corresponding to ${\mathrm{Cr}}^{53}$ nuclear transitions depolarizes ${\mathrm{Al}}^{27}$ nuclei. Both of these observations are consistent with a mechanism involving dynamic nuclear polarization. A theoretical analysis of this mechanism, based on forbidden transitions involving distant nuclei, gives good agreement with observed nuclear polarizations and with the observed behavior of ${\ensuremath{\chi}}^{\ensuremath{'}}$, but predicts small increases in ${\ensuremath{\chi}}^{\ensuremath{'}\ensuremath{'}}$. The increased absorption signal may be explained by enhanced spectral spin diffusion or by a spin packet considerably wider than assumed. Distant ENDOR is expected to occur quite generally.

Hyperfine Spectrum of Chromium 53 in Al 2 O 3

Abstract: Electron nuclear double-resonance techniques were used to observe the hyperfine spectrum of ${\mathrm{Cr}}^{53}$ in ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$. Through analysis of the spectrum at zero degrees a positive value of 48.5\ifmmode\pm\else\textpm\fi{}0.1 Mc/sec was obtained for the hyperfine coupling constant and -0.85\ifmmode\pm\else\textpm\fi{}0.04 Mc/sec for the quadrupole coupling constant. From this a value of -0.03 barn was deduced for the quadrupole moment of ${\mathrm{Cr}}^{53}$.

Nonlinear optics

Abstract: Recent advances in the field of nonlinear optical phenomena are reviewed with particular empphasis placed on such topics as parametric oscillation self-focusing and trapping of laser beams, and stimulated Raman, Rayleigh, and Brillouin scattering. The optical frequency radiation is treated classically in terms of the amplitudes and phases of the electromagnetic fields. The interactions of light waves in a mterial are then formulated in terms of Maxwell's equations and the electric dipole approximation. In this method, non-linear susceptibility tensors are introdueed which relate the induced dipole moment to a power series expansion in field strengths. The tensor nature and the frequency dependence of the nonlinearity coefficients are considered. The various experimental, observations are described and interpreted in terms of this formalism.

Principles of nano-optics

Abstract: 1. Introduction 2. Theoretical foundations 3. Propagation and focusing of optical fields 4. Spatial resolution and position accuracy 5. Nanoscale optical microscopy 6. Near-field optical probes 7. Probe-sample distance control 8. Light emission and optical interaction in nanoscale environments 9. Quantum emitters 10. Dipole emission near planar interfaces 11. Photonic crystals and resonators 12. Surface plasmons 13. Forces in confined fields 14. Fluctuation-induced phenomena 15. Theoretical methods in nano-optics Appendices Index.

Handbook of Optical Materials

Abstract: CRYSTALLINE MATERIALS Introduction Physical Properties Optical Properties Mechanical Properties Thermal Properties Magnetooptic Properties Electrooptic Properties Elastooptic Properties Nonlinear Optical Properties GLASSES Introduction Commercial Optical Glasses Specialty Optical Glasses Fused Silica Fluoride Glasses Chalcogenide Glasses Magnetooptic Properties Electrooptic Properties Elastooptic Properties Nonlinear Optical Properties Special Glasses POLYMERIC MATERIALS Optical Plastics Index of Refraction Nonlinear Optical Properties Thermal Properties Engineering Data METALS Physical Properties of Selected Metals Optical Properties Mechanical Properties Thermal Properties Mirror Substrate Materials LIQUIDS Introduction Water Physical Properties of Selected Liquids Index of Refraction Nonlinear Optical Properties Magnetooptic Properties Commercial Optical Liquids GASES Introduction Physical Properties of Selected Gases Index of Refraction Nonlinear Optical Properties Magnetooptic Properties Atomic Resonance Filters APPENDICES Safe Handling of Optical Materials Abbreviations, Acronyms, and Mineralogical or Common Names for Optical Materials Abbreviations for Methods of Preparing Optical Materials and Thin Films Fundamental Physical Constants Units and Conversion Factors

Coherent Anti-Stokes Raman Scattering Microscopy: Chemical Imaging for Biology and Medicine

Abstract: Coherent anti-Stokes Raman scattering (CARS) microscopy is a label-free imaging technique that is capable of real-time, nonperturbative examination of living cells and organisms based on molecular vibrational spectroscopy. Recent advances in detection schemes, understanding of contrast mechanisms, and developments of laser sources have enabled superb sensitivity and high time resolution. Emerging applications, such as metabolite and drug imaging and tumor identification, raise many exciting new possibilities for biology and medicine.