Laser injection optics for high-intensity transmission in multimode fibers

Robert E. Setchell

doi:10.1117/12.405250

25 October 2000 Laser injection optics for high-intensity transmission in multimode fibers

Robert E. Setchell

Proceedings Volume 4095, Laser Beam Shaping; (2000) https://doi.org/10.1117/12.405250
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

An increasing number of applications are requiring fiber transmission of high-intensity laser pulses. Our particular interest have led us to examine carefully the fiber transmission of Q-switched pulses from multimode Nd:YAG lasers at their fundamental wavelength. The maximum pulse energy that can be transmitted through a particular fiber is limited by the onset of laser-induced breakdown and damage mechanisms. Laser breakdown at the fiber entrance face is often the first limiting process to be encountered, but other mechanisms can results in catastrophic damage at either fiber face, within the initial entry segment of the fiber, and at other internal sites along the fiber path. In the course of our studies we have examined a number of factors that govern the relative importance of different mechanisms, including laser characteristics, the design and alignment of injection optics, fiber end-face preparation, and fiber routing. The present study emphasizes the important criteria for injection optics in high-intensity fiber transmission, and illustrates the opportunities that now exist for innovative designs of optics to meet these criteria. Our consideration of diffractive optics to achieve desired began in 1993, and we have evaluated a progression of designs since that time. In the present study, two recent designs for injection optics are compared by testing a sufficient number of fibers with each design to establish statistics for the onset of laser-induced breakdown and damage. In this testing we attempted to hold constant other factors that can influence damage statistics. Both designs performed well, although one was less successful in meeting all injection criteria and consequently shows a susceptibility to a particular damage process.

Citation Download Citation

Robert E. Setchell "Laser injection optics for high-intensity transmission in multimode fibers", Proc. SPIE 4095, Laser Beam Shaping, (25 October 2000); https://doi.org/10.1117/12.405250

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