Coherent ultra-violet to near-infrared generation in silica ridge waveguides

Dong Yoon Oh, Ki Youl Yang, Connor Fredrick, Gabriel Ycas, Scott A. Diddams and Kerry J. Vahala ()
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Dong Yoon Oh: T. J. Watson Laboratory of Applied Physics, California Institute of Technology
Ki Youl Yang: T. J. Watson Laboratory of Applied Physics, California Institute of Technology
Connor Fredrick: National Institute of Standards and Technology
Gabriel Ycas: National Institute of Standards and Technology
Scott A. Diddams: National Institute of Standards and Technology
Kerry J. Vahala: T. J. Watson Laboratory of Applied Physics, California Institute of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Short duration, intense pulses of light can experience dramatic spectral broadening when propagating through lengths of optical fibre. This continuum generation process is caused by a combination of nonlinear optical effects including the formation of dispersive waves. Optical analogues of Cherenkov radiation, these waves allow a pulse to radiate power into a distant spectral region. In this work, efficient and coherent dispersive wave generation of visible to ultraviolet light is demonstrated in silica waveguides on a silicon chip. Unlike fibre broadeners, the arrays provide a wide range of emission wavelength choices on a single, compact chip. This new capability is used to simplify offset frequency measurements of a mode-locked frequency comb. The arrays can also enable mode-locked lasers to attain unprecedented tunable spectral reach for spectroscopy, bioimaging, tomography and metrology.

Date: 2017
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DOI: 10.1038/ncomms13922

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