Generation of Optical Frequency Combs in an Optical Microresonator Pumped by a 780-nm Laser Diode in Self-Injection Locking Regime

Journal of Experimental and Theoretical Physics - Experimental data for the generation of optical frequency combs in magnesium fluoride microcavities with whispering gallery modes at 780 nm are...     

Effect of the transition layer on ellipsometric measurement of nanodimensional layers

The results of numerical simulation of a nanodimensional film-transition layer-absorbing substrate structure are presented. It is found that the transition layer affects the accuracy of determining the refractive index and thickness of the nanodimensional coating. It is shown that the introduction of the effective values of the refractive index and absorption coefficient of the substrate improves the accuracy of ellipsometric measurements of the nanodimensional film parameters. Physical (full-scale) and numerical experiments demonstrate that, when the thickness and refractive index of a nanodimensional film on a substrate with an unknown transition layer comparable in thickness with the film are measured, it is appropriate to replace the substrate-transition layer structure by a substrate with effective optical parameters. It is found that a change in the thickness of the transition layer does not noticeably affect the accuracy of determining the thickness and refractive index of the film deposited when the effective values of the refractive index and absorption coefficient of the substrate are used.     

Determination of electron affinity of carbonyl radicals by means of negative ion mass spectrometry

Appearance energies of [M-H](-) ions from carbonyl compounds R-CO-R' (R,R' = H, CH(3), NH(2), OH) have been measured by means of negative ion mass spectrometry in resonant electron capture mode. Values of electron affinity of the corresponding radicals, CH(2)&dbond;C(X)O, NH&dbond;C(X)O and O&dbond;C(X)O, have been determined. Copyright 1999 John Wiley & Sons, Ltd.     

Structure transformations and amorphization of Fe-Zr alloy under irradiation with nitrogen ion intense flows

The structure, phase composition, and microhardness of Fe-Zr alloy irradiated with intense nitrogen ion flows have been investigated. Amorphization of particles of the Fe₂Zr intermetallic phase as a result of low-temperature treatment of the alloy with nitrogen ions at 520–600 K has been found. It is suggested that the loss of long-range order in the atom arrangement of the Fe₂Zr phase is mainly related to the crystal lattice destabilization of the intermetallic compound due to implantation of nitrogen atoms into lattice interstitial sites. An increase in the temperature of ion-beam treatment of the alloy above 600 K results in the formation of nanosized particles of the ZrN phase in a surface layer.     

Structure and chemistry of a zwitterionic amine-aldehyde adduct

The zwitterionic tetrahedral addition product 1 is the preferred form of the amino-aldehyde 4 in polar solvents and in the crystal, where a molecule of water controls the structure.     

Nonstationary fluctuations in the intensity and aiming of YAG laser emissions

Result are presented from an experimental investigation of nonstationary fluctuations in the intensity and aiming of a stabilized continuous-wave Model 126 Lightwave laser. We discuss mechanisms of their emergence, ways of describing them, and procedeures for suppressing them.     

Directional limits on persistent gravitational waves using LIGO S5 science data

The gravitational-wave (GW) sky may include nearby pointlike sources as well as stochastic backgrounds. We perform two directional searches for persistent GWs using data from the LIGO S5 science run: one optimized for pointlike sources and one for arbitrary extended sources. Finding no evidence to support the detection of GWs, we present 90% confidence level (C.L.) upper-limit maps of GW strain power with typical values between 2-20×10(-50) strain(2)?Hz(-1) and 5-35×10(-49) strain(2)?Hz(-1)?sr(-1) for pointlike and extended sources, respectively. The latter result is the first of its kind. We also set 90% C.L. limits on the narrow-band root-mean-square GW strain from interesting targets including Sco X-1, SN 1987A and the Galactic center as low as ≈7×10(-25) in the most sensitive frequency range near 160 Hz.