Report on CLEO/IQEC'87. I. Lasers.

I Free Electron Lasers*

Helical Large-Core Fiber Lasers Final Report

Temperature Effect on THz Quantum Cascade Lasers

A simple semi-phenomenological model, which accurately predicts the dependence of thresholdcurrent for temperature of Resonant-phonon three well quantum cascade laser based on verticaltransitions is offered. We found that, the longitude optical phonon scattering of thermally excitedelectrons is the most important limiting factor for thermal performance of high frequency THz QCLs.In low frequenc...

GaN-Based Lasers on SiC: Influence of Mirror Reflectivity on L-I Characteristics

Threshold current density and differential slope efficiency as function of end-mirror reflectance have been measured to estimate the internal losses of GaN-based laser diodes. An Al-coated fiber tip is used as an external micro-mirror to vary the reflectance of the end facets allowing for a continuous adjustment of mirror losses of a particular laser. The effective reflectance of the external r...

ON OPTIMAL NOZZLE SHAPES OF GAS-DYNAMIC LASERS

Pontryagin's principle is used to study the shape of the supersonic part of the nozzle of a carbon dioxide gas-dynamic laser whose gain is maximal. The exact shape is obtained for the uncoupled approximation of Anderson's bimodal model. In this case, if sharp corners are allowed, the ceiling of the supersonic part consists of a slant rectangular sheet followed by a horizontal one; otherwise...