Temporally and spatially shaped fully-fiberized ytterbium-doped pulsed MOPA

✍ Scribed by D. Lin; S.U. Alam; A. Malinowski; K.K. Chen; J.R. Hayes; J.C. Flannagan; V. Geddes; J. Nilsson; S. Ingram; S. Norman; D.J. Richardson

• Book ID: 102452512
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 194 KB
• Volume: 8
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.201110057

✦ Synopsis

We report a fully-fiberized, pulsed ytterbium-doped master oscillator power amplifier (MOPA) for materials processing applications providing both a temporal pulse and spatial beam shaping capability operating at a maximum average output power of 100 W. Adaptive temporal pulse shaping using an in-line electro-optic modulator was incorporated to reduce the impact of dynamic gain saturation and optical Kerr/Raman nonlinearities. The MOPA is capable of generating 2.5 mJ flattopped optical pulses with 20 kW peak power as well as other user-defined, shaped pulses. Spatial beam shaping is obtained using a pair of axicon (conical) lenses at the end of the beam delivery optic allowing ring shaped output beams to be generated from the otherwise collimated Gaussian output. Peak power, kW 0 10 20 30 500 400 300 200 100 0 Time, ns 25 W 60 W 100 W

The MOPA output with temporal and spatial shaping (inset)