Quantum theory of an optical maser.
Quantum theory of laser having only single-mode oscillation and ignoring atomic motion and spatial variations in cavity mode
QUANTUM THEORY↗
SEARCH · Engineering Papers
Results for “single mode”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Effects of collisions on saturation behavior of the 1.15- mu transition of Ne studied with He-Ne laser.
Output power frequency response of single mode helium neon laser, determining effects of atomic collisions on frequency response of individual atoms
FREQUENCY RESPONSE↗
Nonlinear oscillations of a fluttering plate. II.
Quasi-steady aerodynamic and von Karman large deflection plate theory equations of nonlinear oscillations of fluttering plate for single mode subsonic and sonic or coupled mode supersonic oscillations
VON KARMAN EQUATION↗
Dynamic buckling of elastic structures - Criteria and estimates.
Single mode analysis of dynamic buckling of imperfection-sensitive elastic structure prone to catastrophic failure under time dependent load
STRUCTURAL FAILURE↗
Quantum theory of an optical maser. I.
Quantum theory of laser having only single-mode oscillation and ignoring atomic motion and spatial variations in cavity mode
LASER↗
Nonlinear oscillations of a fluttering plate. II.
Quasi-steady aerodynamic and von Karman large deflection plate theory equations of nonlinear oscillations of fluttering plate for single mode subsonic and sonic or coupled mode supersonic oscillations
VON KARMAN EQUATION↗
A spatially coherent optical waveguide detector.
Optical detector using length of single mode optical waveguide with photodetector at output for null detection
WAVEGUIDE↗
A 10.6-mu optical heterodyne communication system.
Optical heterodyne communication system with single mode and frequency carbon dioxide laser, noting coherent photon noise limit
Mocker, H. W.↗
Semiclassical theory of a high-intensity laser.
Lamb theory of Doppler broadened gas laser extended to arbitrary intensities for single mode operation, calculating detuning curves and inversion densities
Lamb, W. E., Jr.↗
Directional coupler for optical waveguides
Feasibility study of transmitting optical energy in single mode through photonic waveguides results in a conceptual directional coupler consisting of two types of optical waveguides /a stratified /core/ dielectric and a mirror wall/. Waveguide medium analysis produced formulation of mode cutoff conditions, field distributions, and propagation characteristics.
Schineller, E. R.↗
Theory of a high-intensity gas laser
Single mode gas laser theory for arbitrary field intensities in terms of ensemble averaged form of density-matrix equations of motion
Feld, M. S.↗
Hyperfine structure of excited states and quadrupole moment of Ne-21 using laser-induced line-narrowing techniques.
Observation results are presented on the optical hyperfine structure in Ne-21 obtained with the aid of laser-induced line-narrowing techniques. The output from a long stabilized single-mode 1.15-micron He-Ne laser focused into an external sample cell containing Ne-21 was used in implementing these techniques. Their applicability is demonstrated for optical hyperfine structure observation in systems whose features are ordinarily masked by Doppler broadening.
Ducas, T. W.↗
Theory of some laser noise effects.
A simple version of the semiclassical theory is applied to the shot effect. Considerations of thermal noise reported by Lamb (1965) are extended to take into account amplitude fluctuations. The laser is considered to be a lossy cavity of the Fabry-Perot type in single-mode operation with a circular frequency driven by an inverted population of active atoms. The electric field is taken to be transverse to the cavity axis. The amplitude and phase are assumed to be slowly varying functions which satisfy two self-consistency equations.
Wang, Y. K.↗
Brillouin-scattering measurements of the acoustic absorption coefficient in liquid CS2
High-resolution Brillouin spectra were recorded for light scattered at small angles from liquid CS2. The use of a single-mode He-Ne laser, locked in frequency to a Fabry-Perot interferometer, permitted measurements of line widths of the order of 10 MHz for frequencies in the range 300-1000 MHz. These measurements extend previous Brillouin line-width measurements at higher frequencies into the region where relaxation effects are dominant and connect the optical measurements with lower-frequency acoustical data.
Coakley, R. W.↗
Excitation by rockets
Standard methods of excitation are not always practical when a single mode of known frequency requires investigation. This form of investigation is often required on a modified aircraft. A new method of excitation was developed and proved in flight, which consists of firing small rocket charges attached to the aircraft structure. Damping values at gradually increasing airspeeds are obtained, as in Stick Jerk tests, and flutter speeds predicted.
Tammadge, C. E.↗
Development of a monolithic GaAs integrated optical transmitter
The paper discusses a program designed for the development of a GaAs IOC transmitter consisting of a monolithic surface laser whose output is coupled into patterned channel waveguides. Modulation and switching of the radiation occur in the waveguide circuit and are controlled separately. These structures are to be fabricated monolithically on a single semiconductor chip with each device amenable to integrated low-cost manufacture. The waveguide outputs of the IOC transmitter will be coupled to single mode optical fibers which form a transmission cable. The properties of the semiconductors (Ga,Al)As and (Ga,In)As permit performance of each of the basic functions included in the device considered. The concept of monolithic nondiscrete GaAs diode lasers is examined along with optical stripline channel waveguides and electro-optic channel waveguide modulators and switches.
Blum, F. A.↗
Far-field multimodal acoustic radiation directivity
Approximate equations for the far field acoustic radiation patterns in the forward quadrant from a flanged circular duct were compared with exact equations for both single and multimodal excitations. The single mode comparison showed good agreement between the exact and approximate equations for the principal lobes of higher radial order modes. For lower and especially for zero radial order modes, there was some error in the angular location and decibel level of principal lobe peak pressure obtained from the approximate equation. Some agreement of sidelobes was also observed although the approximate equation was not intended to simulate the sidelobes. The multimodal approximate summation equations consisting only of a simple function of directivity angle and an acoustic power biasing function were checked against the exact equations for several distributions of modal power and showed excellent agreement with exact equations for all cases. Although many modes contribute to the final level and shape of the directivity curve, the major contributions appear to come from the higher radial order modes.
Saule, A. V.↗
Fresnel-Fizeau effect in a rotating optical fiber ring interferometer
Measurements of the Fresnel-Fizeau effect in a fiber ring interferometer gyroscope are reported. The presence of the dispersion term in the Fresnel drag coefficient was discernable. The temperature dependence of the coefficient bears on the temperature sensitivity of the optical fiber gyroscope. An alternate approach to measuring fiber dispersion is an added benefit, leading to determination of maximum pulse rate transmitted through single-mode fibers.
Vali, V.↗