Delivery of high energy light through pbg fiber for laser machining

Jonathan D. Shephard, B. J. Mangan, J. D C Jones, Geraud Bouwmans, P. St J Russell, Jonathan C. Knight, Duncan P. Hand

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Conventional silica fiber optics cannot currently deliver the high beam quality, high peak power pulses required for micro-machining applications due to damage limitations. Recently developed photonic bandgap (PBG) fibers have the potential to overcome this limitation as the power is mostly contained within an air-core, with guidance arising from the periodic nature of the cladding. We report the delivery of high energy nanosecond pulses from a high repetition rate (up to 100 kHz) Q-switched Nd:YAG laser through the fundamental mode of a PBG fiber at 1064 nm. The damage limitations of the PBG silica structure are investigated, together with its application to precision micro-machining. We present an optimized fiber design to reduce the light-in-glass fraction and hence maximize the power handling capability. Short pulses (around 60 ns pulse width) and energies of the order of 0.5 mJ were delivered in a single spatial mode through the hollow-core fiber providing the pulse energy and high beam quality required for micro-machining of metals. Practical micro-machining of metal sheet is also presented.

Original languageEnglish
Title of host publicationICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings
Publication statusPublished - 2004
EventICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics - San Francisco, CA, United States
Duration: 4 Oct 20047 Oct 2004

Conference

ConferenceICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics
CountryUnited States
CitySan Francisco, CA
Period4/10/047/10/04

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    Shephard, J. D., Mangan, B. J., Jones, J. D. C., Bouwmans, G., Russell, P. S. J., Knight, J. C., & Hand, D. P. (2004). Delivery of high energy light through pbg fiber for laser machining. In ICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings