GW’s Quasi continuous wave (QCW) fiber lasers operating in the near IR at 1070 nm have unique properties such high pulse energy with high peak power and very good beam quality. Consequently extreme high power densities are possible allowing for adequate coupling and high quality machining of materials that are typically transparent at these wavelengths. QCW lasers can operate with variable pulse length in pulsed mode at high repetition rate as well as in CW mode at high average power which translates into high throughput machining.