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.
Highlights
Short duration, intense pulses of light can experience dramatic spectral broadening when propagating through lengths of optical fibre
The dispersive wave, which can be understood in terms of an analogy to Cherenkov radiation[34], provides a powerful way to both engineer the spectral extent of the resulting optical continuum and to spectrally concentrate optical power in new bands[22,35]
The dispersive wave emission wavelength is precisely tuned from ultraviolet to visible by lithographic control of the waveguide dimensions
Summary
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. 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. Arrays enable precisely targeted wavelength emission for optimal self-referencing As shown here, their compactness eliminates the need for delay lines in these systems. Their compactness eliminates the need for delay lines in these systems This class of devices can be combined with microcombs and compact modelocked lasers to provide user-designed coherent, short pulse light for optical clocks[28], laser cooling[29], quantum manipulation of atoms and ions[30], and bioimaging[31]. The continuum spectra produced by the waveguide arrays are analysed and modelled in detail
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