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Articles 1 - 5 of 5
Full-Text Articles in Engineering
Threshold Characteristics Of Multimode Laser Oscillators, Lee W. Casperson
Threshold Characteristics Of Multimode Laser Oscillators, Lee W. Casperson
Electrical and Computer Engineering Faculty Publications and Presentations
The oscillation characteristics of a multimode laser are considered in detail, and for the first time saturation by all of the cavity modes is included. Analytical expressions are obtained for the mode amplitudes, linewidths, and over‐all spectral characteristics of lasers operating above and below threshold. It is found that with increasing excitation the spontaneous emission spectrum is gradually resolved into a set of narrow discrete modes. Slightly above threshold the number of modes reduces in a homogeneoulsy broadened laser until only a single mode is oscillating strongly. The theoretical results are in agreement with experimental data that have been reported …
Mode Properties Of Annular Gain Lasers, Lee W. Casperson, Mohammad Shabbir Shekhani
Mode Properties Of Annular Gain Lasers, Lee W. Casperson, Mohammad Shabbir Shekhani
Electrical and Computer Engineering Faculty Publications and Presentations
The properties of a new class of laser resonators are investigated theoretically and experimentally. In these lasers the radiation propagates longitudinally in an annular amplifying medium, and useful low loss modes can be obtained even when the axial region is obscured. Alignment characteristics and far field patterns are discussed, and experiments have been conducted using coaxial double-discharge CO₂ devices.
Plasma Diagnosis By Laser Beam Scanning, Lee W. Casperson, T. K. Cheng
Plasma Diagnosis By Laser Beam Scanning, Lee W. Casperson, T. K. Cheng
Electrical and Computer Engineering Faculty Publications and Presentations
A procedure is developed for determining the radial electron density and temperature profiles of a rotationally symmetric plasma. This high‐resolution technique involves measuring the deflection of laser beams incident transverse to the plasma. Diagnosis of a stable atmospheric pressure argon arc with CO₂ and He‐Ne laser beams yields results in good agreement with spectroscopic methods.
Gaussian Modes In High Loss Laser Resonators, Lee W. Casperson, Susan D. Lunnam
Gaussian Modes In High Loss Laser Resonators, Lee W. Casperson, Susan D. Lunnam
Electrical and Computer Engineering Faculty Publications and Presentations
Matrix techniques are applied to the mode analysis of laser resonators having spherical mirrors and Gaussian profiles of the mirror reflectivity. These same analytical methods provide a useful approximation to the mode and loss characteristics of conventional resonators having an abrupt discontinuity of the reflectivity. Mode selection in apertured waveguides and resonators is also discussed.
Electromagnetic Modes Of An Inhomogeneous Sphere, Lee W. Casperson
Electromagnetic Modes Of An Inhomogeneous Sphere, Lee W. Casperson
Electrical and Computer Engineering Faculty Publications and Presentations
Vector wave solutions are derived for the electromagnetic modes of a sphere having radial variations of the refractive index and gain. For some inhomogeneity models, confined-mode solutions exist. The results are applicable to the refracting atmospheres of stars and planets.