TEA CO2 laser machining of CFRP composite

Switch-less operation of a TEA CO2 laser.

We report here the operation of a UV pre-ionised mini-TEA CO2 laser where the use of an external switch has been dispensed with. This was rendered possible by making the preioniser spark array play a dual role- that of a switch as well as of a source of UV photons that pre-conditioned the inter-electrode volume.

Rotational Relaxation Studies in Co2 Molecules by Means of a Multiline Tea Co2 Laser System

One of the most serious problems in high-power, short-pulse, 10.6#m CO2 laser systems is the efficiency. When the short-pulse (pulse duration _~ 1 ns) amplification efficiency is compared to the efficiency of normal "long-pulse" (pulse duration "-lOOns) CO2 amplifying systems, the former is rather poor. As is well-known, energy extraction from a laser amplifier only occurs at the wavelengths wh...

Electromagnetic Shielding Property of Cfrp Composite Laminates

Laser Machining of Graphene

Since Geim and Novoselov’s successful production of high quality graphene, its unique properties have found a number of applications. But graphene is not an exotic chemical compound; instead, it is a sheet of graphite, one atom think. Before 2008, the only way to produce graphene was through successive pealing of graphite with scotch tape until graphite flakes as thin as 1 atomic layer were lef...

[Composite retention area produced by CO2 laser beam].

Laser effect on enamel is manifested as consequence of temperature changes. Enamel melts, vaporises and a crater, and fissures are formed. Retention surface for anchoring of composite resin was obtained in intact approximal surfaces of premolars with CO2 laser (0.5, 1 and 3 W, sport size 1 and 1.5 mm, 0.2 and 0.5 s). The study results reveal composite and lased enamel interfaces are stronger th...