Showing papers in "Optics Communications in 1976"

TL;DR: In this paper, the stationary behavior of a homogenously broadened system of atoms driven by a coherent resonant field is discussed. And the spectrum of the fluorescent light undergoes a first-order phase transition for high density of the atomic system.

TL;DR: In this article, a method of obtaining narrow absorption lines is proposed, based on a simple property of accelerated beams, which would yield a resolution of a few megahertz at optical frequencies.

TL;DR: In this paper, the authors describe a phenomenon in which a gratinng with very shallow grooves absorbs virtually all of the light of a given wavelength which is incident upon it.

TL;DR: In this article, the possibility of using Bragg reflection to obtain lossless confined propagation in slabs with a lower dielectric constant than that of the surrounding media is proposed and analyzed.

TL;DR: In this article, the refractive indices and optical birefringence of congruently grown lithium niobate (LiNbO3) have been measured at 0.633 μm and 3.39 μm in the temperature range 20° to 600°C.

TL;DR: In this article, the Fourier absorption spectra of HCl and HF at room temperature were measured and the absolute observed position of the P(6) line of the 1-0 band of HF was found equal to 110 725 739 ± 7.5 MHz.

TL;DR: An elementary procedure for calculating quantum mechanically the time-dependent rotation-vibration wave function for a collisionless model of a polyatomic molecule in a monochromatic radiation field is described and applied to some very simple cases as discussed by the authors.

TL;DR: In this article, the authors present a completely classical analysis of the small-signal regime of a free-electron laser and show that the amplification is due to stimulated scattering produced by a bunching of the electron distribution.

TL;DR: In this article, a method for simultaneous cooling and trapping of atoms and molecules in a low-pressure gas under forces caused by recoil during spontaneous or induced transitions of the particles in the resonance field of a three-dimensional standing light wave is proposed.

TL;DR: In this paper, the quantum numbers of the SF 6 transitions from the ground state to v 3 = 1 that fall within ± 1.5 G Hz of the CO 2 P(14), P(18), and P(20) laser lines have been assigned.

TL;DR: In this paper, it was shown that consecutive nearly resonant transitions are possible in SF 6 up to υ 3 = 5 to 10 in the presence of degenerate vibrational states, which can be comparable in magnitude to the net anharmonic shift of the level.

TL;DR: In this paper, the statistical properties of speckle intensity variations produced by coherent light in the far-field diffraction plane of an iluminated area of an object are studied experimentally as a function of the radius of an illuminating beam over the object and are found to have a relation to its surface roughness and correlation lenght.

TL;DR: In this article, it is shown that metallic gratings can exhibit anomalies which consists of total absorption of a plane wave. But this is not the case for all grating anomalies.

TL;DR: In this paper, the dispersion characteristics of the vibrational quasicontinuum have been obtained and a theoretical model of the processes of SF6 dissociation has been discussed, showing that the selectivity of dissociation is increased compared to the single frequency dissociation case.

TL;DR: In this article, the use of optical Mellin transforms in matched spatial filter correlation of images that differ in scale is discussed, and the intensity of the correlation peak is found to be indeigendent of the input scale.

TL;DR: In this article, the effects having influence on the reproducibility of the frequency by molecular reference and the necessity of identity conditions for cells with left and right molecules (CHFClBr) are discussed.

TL;DR: In this article, the evanescent part of a guided wave was used as the reference wave and/or the illuminating one to reconstruct a wave-guide hologram from a plane reference wave.

TL;DR: Several new derivatives of 7amino coumarin and 7-amino-(2)-quinolone were synthesized and tested for lasing performance as mentioned in this paper, and relative output, stability and lasing wavelength for these dyes were reported.

TL;DR: In this article, the doublets arising from the 3 2 D, 5 2 S, 4 2 D and 6 2 S transitions were observed whenever sodium vapour is illuminated with a cw dye laser tuned to the wavelength of one of the D-lines.

TL;DR: In this paper, the measurement of vibrational and rotational temperatures of D 2 at the center of an electrical discharge has been demonstrated by a new diagnostic technique: Coherent Anti-Stokes Raman Spectroscopy (CARS).

TL;DR: In this paper, the coherent interaction of molecular multilevel systems with quasi-resonant laser ir fields is considered and the effect of molecular leakage from the ground state to high vibrational levels is revealed.

TL;DR: Using generalized Ginzburg-Landau equations derived recently, the authors solved the laser equations analytically for the case of spontaneous ultra-short laser pulses and compared their results with previous computer solutions by Risken and Nummedal.

TL;DR: In this article, the first successful results have been obtained demonstrating interference effects in the reflectance of multilayer films at high photon energies where n = 1 and k is large.

TL;DR: In this article, a new method based on the optoacoustic effect has been proposed to measure multiple photon absorption at vibrational molecular transitions in a strong IR laser field, which can be used to measure the average absorbed energy.

TL;DR: In this article, simple approximative equations governing the temporal behavior of both the mean photon number, n, and its mean square deviation, Δn2, in the process of k-photon absorption (k = 1, 2, …) are derived and solved for initial photon distributions characterized by n ≫ 1 and Δn 2 ⪌ n -2.

TL;DR: In this paper, exact solutions for the surface roughness dependence of the speakle contrast were obtained for a class of simple models, and a recent gaussian-field approximation to the speckle statistics was generalized, and shown to give results in good agreement with the exact results obtained.

TL;DR: When a double- or multi-heterostructure GaAlAs laser is irradiated by its own output laser beam, an oscillatory shift of about 25 MHz is observed in the electric conductivity of the laser.

TL;DR: In this article, a simple model was used to investigate mismatch effects on the behavior of a continuously operated dye laser synchronously pumped by a mode-locked argon-ion laser, and good mismatch control as well as appropriate gain-to-loss ratio were shown to be of major importance for laser operation in a clean picosecond pulse regime.

TL;DR: In this article, a graphical method is presented for separating the causes of optical fiber losses, and some examples are given showing the use of this technique and some results derived from this technique are presented.

TL;DR: In this article, the radiation from Q-switched neodymium-glass lasers was used to generate high amplitude stress waves in thin metal targets, and peak pressures exceeding 2 GPa were obtained by use of water and paint coatings.