CW 20-kW SAGE CO/sub 2/ laser for industrial use

New additional cooling effect of diffusion cooled sealed-off CO2 lasers excited by dielectric barrier discharges at about 1 MHz with an all-solid-state generator

“…Such all-solid-state generators reach excitation efficiencies of more than 90%. Up until now, hf high voltage is only used to excite fast axial flow CO 2 lasers [4,5,11]. By using an all-solid-state generator with frequencies between 0.4 MHz to 2.4 MHz (hf) combined with a dielectric barrier discharge a remarkable high electrical input power density of 25 Wcm −3 can be reached at a discharge gap of 6 mm.…”

Longitudinal disch. CO2 laser with pulsed pre-ionization

“…Compared with a transverse discharge scheme, a longitudinal scheme has excellent beam quality due to the coaxial structure of laser medium, and the laser can be operated at single mode or well-controlled mode. Because diffusive cooling does not need a blower as convective cooling does [3,4], the volume and weight of the laser will be reduced to be favorable of forming a compact laser. Moreover, by varying parameters like gas pressure and tube diameter properly the characteristic time of cooling can be shortened greatly, thus making pulsed laser work at a high repetition rate of several kilohertz.…”

Sealed-off CO2lasers excited by an all-solid-state 0.6 MHz generator

“…The excitation efficiency of the all-solid-state generator reaches more than 90%. Up until now, hf high voltage was used only to excite fast axial flow CO 2 lasers [4,5,9]. In this paper, a hf excited sealedoff slab CO 2 laser is described which is a new candidate for low-cost, compact CO 2 lasers.…”