Engineering topics

Ryan, J. C.

Publications and source records attributed to Ryan, J. C..

4 records

NASA NTRS1989

Multiple relaxation and inhomogeneous broadening in resonance enhanced Raman scattering - Application to tunable infrared generation

The solutions for the imaginary susceptibility of the Raman field transition with arbitrary relaxation rates and field strengths are examined for differing sets of relaxation rates with emphasis on alkali metal vapors which have spontaneous emission dominated relaxation. The model is further expanded to include Doppler broadening and used to predict the peak gain as a function of detuning for a frequency doubled alexandrite laser-pumped cesium vapor gain cell.

Ryan, J. C.↗

NASA NTRS1987

Instabilities in a three-level coherently pumped laser

A theory for a coherently pumped, homogeneously broadened laser is developed which predicts instability at excitations 1.6 times threshold. The system exhibits a period-doubling sequence, chaos, and a period-three window.

Ryan, J. C.↗

NASA NTRS1986

Density matrix solutions for the susceptibilities of a three-level system with arbitrary relaxation rates and field strengths

The susceptibilities for a three-level system with arbitrary pump and signal field strengths are derived for arbitrary longitudinal and transverse relaxation rates. The results are of interest in connection with the calculation of the Raman gain in systems where resonance enhancement plays a dominant role.

Ryan, J. C.↗

NASA NTRS1975

Trimetric Scale for Drafting Machines

Device allows three basic projections to be drawn from a single scale zero setting. Ellipse proportions are included for convenience. Axonometric projections can also be determined.

Ryan, J. C.↗