GEKKO IV glass laser system delivering output power of 4 TW in 100 ps and output energy of 2 kJ in 1 ns in 4 beams has been successfully developed. System design, major components, and operation of this laser system are described, and various aspects related to high power laser systems are briefly reviewed.
A new structure of stripe-geometry lasers is proposed where a double heterostructure is fabricated on a terraced substrate. The lasing mode is confined and stabilized in the narrow area between two adjacent bends of the active layer. No kinks have been observed in light output-current characteristcs. The terraced substrate laser exhibits a stable single longitudinal mode oscillation as well as a fundamental transverse mode oscillation. Beam divergences of far-field pattern in the direction parallel and perpendicular to the junction plane are 20° and 34°, respectively.
Production of the 26min. isomer of 235 U has been observed in a laser produced uranium plasma by detecting internal conversion electrons from 235 Um. It can be attributed to nuclear excitation by electron transition (N E E T).