Showing papers in "Optics Communications in 1974"

TL;DR: In this article, a narrow (Δ≈0.7 cm −1 ), long-lived (τ≈some hours) gap in broad-band absorption spectra of perylene and 9-aminoacridine in ethanol at 4.2 K has been discovered and investigated.

TL;DR: In this article, the π-electron contribution to linear and non-linear polarizabilities of conjugated chains was investigated and the respective influence of chain length and bond alternation on optical nonlinearities were analyzed.

TL;DR: In this paper, the spatial variations in the second-order nonlinear susceptibility of a ZnSe polycrystal were used to generate images of its physical structure at the second harmonic frequency (532 nm) of an incident 1.06 μm laser beam.

TL;DR: In this paper, the optically forbidden 3s-4d transition in sodium vapor was observed using two-photon excitation with a cw dye laser and monitoring the 4d population via fluorescence cascades.

TL;DR: Holographically made zone plates are described in this article, where imaging properties and spectrometric applications are discussed and experimental results with soft X-radiation are given, and a detailed discussion of the application of zone plates is given.

TL;DR: In this paper, a speckle-shearing interferometer was developed using a sheared Michelson interferometers, which utilizes the speck effect of coherent light.

TL;DR: In this article, an experimental investigation is made of the effect of surface roughness on the statistical distribution of image speckle intensity, which is formed by spatially coherent light at the image plane of an object having some roughness and its statistical properties are investigated.

TL;DR: In this paper, the half-wave voltages, the electro-optic (EO) and the polarization coefficients of orthorhombic KNbO 3 have been evaluated.

TL;DR: In this article, the difference frequencies between rare isotope CO lasers and a 12 C 16 O laser have been measured by optical heterodyne techniques, and the results were used to determine a set of mass independent parameters Δ kl and U kl.

TL;DR: In this paper, the mode spectrum and the eigenmodes of inhomogeneous optical waveguides were calculated using the WKB-approximation technique using three different index profiles of physical interest.

TL;DR: In this article, it was shown that in the situation where the resonance of the transition layer vibrations with surface polaritons exists, a splitting of the surface polariton branch appears.

TL;DR: An optical technique for performing general types of map transformations is introduced using a coherent system, where the object distribution is multiplied by a phase function so that its frequency spectrum constitutes the transformation as discussed by the authors.

TL;DR: In this paper, Raman spectra taken several picoseconds after an intense vibrational excitation indicate rapid energy transfer between neighboring states, and equilibrium between several CH-levels around 2900 cm-1 is established within ∼ 1 ps.

TL;DR: In this article, the excitation conditions of Raman scattering in a few microns thick film by light trapping in the film were searched for and the spectra obtained in different polarizations were given.

TL;DR: In this paper, a method used to make an almost aberration free lens is presented, where the apparent refractive index of an optical waveguide depends on its thickness, elements with varying index are relatively easy to fabricate.

TL;DR: In this paper, the theory of partially developed speckle patterns is reviewed and exact solutions for the speckles contrast as function of surface roughness are calculated for two different surface models.

TL;DR: In this paper, a high sensitivity 337 μm HCN laser interferometer for plasma electron density measurements is described, which has a time resolution of 100 μsec and a sensitivity of 10 -2 fringe.

TL;DR: In this paper, a statistical formulation is given explaining the fibrous structure seen in speckle patterns in polychromatic light, and it is shown that the appearance of the structure is strongly dependent on the surface roughness of the diffuser.

TL;DR: In this paper, the effect of spatial coherence of the illuminating light on the contrast variations of the image speckle intensity distribution is theoretically evaluated under various statistical conditions of the diffusing object.

TL;DR: In this paper, the spectrum of the surface roughness of thin silver films is determined by the angular dependence of scattered light from surface plasma waves, generated by the method of attenuated total reflection.

TL;DR: By properly shaping its periodic profile, a thin-film dielectric grating can concentrate the power from an incident surface wave into a beam that appears selectively either above or below the grating as discussed by the authors.

TL;DR: In this paper, a waveguide method of providing a selective surface for solar energy applications is described, and some measurements of a vacuum-deposited mesh are given, and elementary theory indicates that ratios of solar absorptance to thermal emittance of 30:1 should be possible at temperatures of about 200°C.

TL;DR: In this article, the single mode performances of a CW-TEA (double discharge) CO2 hybrid laser are reported, and single longitudinal and single transverse mode emission has been obtained in the short laser pulse regime (200 mJ, 150 ns fwhm).

TL;DR: In this paper, an electric hexadecapole moment in the ground state of free sodium atoms was observed, and the ΔmF = 4 coherence, which corresponds to this moment, was created by the light field of a cw dye laser.

TL;DR: In this paper, the authors obtained fifteen percent average internal power conversion efficiency for second harmonic generation in CdGeAs2 of radiation from a TEA CO2 laser operating at 10.6 μm.

TL;DR: In this article, the time-dependent factorial moments of the light field intensity and the probability to find n photons in the field were calculated for two-level systems with two-photon transitions.

TL;DR: In this paper, a theoretical analysis of this technique is given, which is based upon the assumption that the modes are supported with energy not only by a reservoir of atoms common to all modes, but, in addition, by single reservoirs coupled to the modes in a one-to-one correspondence.

TL;DR: In this paper, the authors show that spatial hole burning is an important cause of mode selection in cw dye lasers and demonstrate that the mode selection can be eliminated by placing the dye cell in the center of the laser cavity.

TL;DR: Several new coumarin derivatives are reported and their relative photochemical stability under flash and cw excitation is investigated in this paper. But there seems to be no simple relation between the cw bleaching rate and the number of laser shots obtainable from any particular dye solution.

TL;DR: In this article, an acoustically resonant opto-acoustic gas concentration detector is described, and a comparatively small background signal from the detector is obtained, compared with the theoretically expected values.