Dynamic instabilities in the interaction of transverse modes in a class-B laser

Abstract

A large set of calculations has been carried out providing a basis for diagnostics of fusion plasmas through emission resulting from radiative de-excitation following charge transfer between hydrogen and highly charged argon ions, so-called argon charge exchange recombination spectroscopy. These results have been obtained using the classical trajectory Monte Carlo (CTMC) method to treat charge transfer to states with principal quantum numbers up to 30 or more. Nine collision energies between 13.3333 and 250 keV/u pertinent to neutral beam injection have been considered for Ar q+ (q = 15-18) colliding with atomic hydrogen in both the ground and metastable states. Atomic orbital close coupling calculations have also been undertaken in order to provide a fully quantum mechanical test of the CTMC results for Ar 18+ + H(1s) collisions. The results of the calculations are discussed here and the full set of data is made available through a web posting.

Stabilization of class-B broad-area laser emission by external optical injection

“…This class of lasers is of greatest importance for application, as it includes most of the high-demand laser types (solid-state, semiconductors). Class-B lasers exhibit especially complex spatio-temporal dynamics associated with the competition of either longitudinal modes [19][20][21] or transverse modes in smallarea lasers [22][23][24][25]. It was also found that in broad-area class-B lasers filamentary instabilities become especially wellpronounced.…”