Supercontinuum generation in tantalum pentoxide waveguides for pump wavelengths in the 900 nm to 1500 nm spectral region

Woods, Jonathan; Daykin, Jake; Tong, Amy S. K.; Lacava, Cosimo; Petropoulos, P.; Tropper, A.C.; Horák, Péter; Wilkinson, James S.; Apostolopoulos, Vasilis

doi:10.1364/oe.403089

Cited by 17 publications

(7 citation statements)

References 31 publications

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“…Second, the effectiveness of the nonlinear processes is increased by waveguide dispersion engineering, allowing a careful control over the dispersion curves and obtaining a desired result suitable for a given application. This has been demonstrated over the last years for several different PIC platforms [20][21][22][26][27][28][29][30][31][32] . All these properties, in conjunction with demonstrated techniques for achieving low input coupling losses [33][34][35] , add to the great appeal of the LNOI PIC platform.…”

Section: Introductionmentioning

confidence: 81%

Stable and compact RF-to-optical link using lithium niobate on insulator waveguides

Obrzud,

Denis,

Sattari

et al. 2021

Preprint

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Optical frequency combs have become a very powerful tool in metrology and beyond thanks to their ability to link radio frequencies with optical frequencies via a process known as self-referencing. Typical self-referencing is accomplished in two steps: the generation of an octave-spanning supercontinuum spectrum and the frequency-doubling of one part of that spectrum. Traditionally, these two steps have been performed by two separate optical components. With the advent of photonic integrated circuits, the combination of these two steps has become possible in a single small and monolithic chip. One photonic integrated circuit platform very well suited for on-chip self-referencing is lithium niobate on insulatora platform characterised by high second and third order nonlinearities. Here we show that combining a lithium niobate on insulator waveguide with a silicon photodiode results in a very compact and direct low-noise path towards self-referencing of mode-locked lasers. Using digital servo electronics the resulting frequency comb is fully stabilized. Its high degree of stability is verified with an independent out-of-loop measurement and is quantified to be 6.8 mHz. Furthermore, we show that the spectrum generated inside the lithium niobate waveguide remains stable over many hours.

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Section: Introductionmentioning

confidence: 81%

Stable and compact RF-to-optical link using lithium niobate on insulator waveguides

Obrzud,

Denis,

Sattari

et al. 2021

Preprint

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“…A wide SC spanning 1.5 octaves could be generated in a Ta 2 O 5 waveguide, air-cladded as to reach the desirable anomalous dispersion around 1 μm [ 155 ], with relatively low input pump power, showing the potential of the platform. In [ 156 ], the authors performed a detailed study of the behavior of the spectral broadening in both air-clad and silica clad Ta 2 O 5 waveguides with large cross sections. They studied the influence of the pump wavelength and polarization state.…”

Section: Supercontinuum Generation In Other Integrated Platformsmentioning

confidence: 99%

Supercontinuum in integrated photonics: generation, applications, challenges, and perspectives

et al. 2023

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Frequency conversion in nonlinear materials is an extremely useful solution to the generation of new optical frequencies. Often, it is the only viable solution to realize light sources highly relevant for applications in science and industry. In particular, supercontinuum generation in waveguides, defined as the extreme spectral broadening of an input pulsed laser light, is a powerful technique to bridge distant spectral regions based on single-pass geometry, without requiring additional seed lasers or temporal synchronization. Owing to the influence of dispersion on the nonlinear broadening physics, supercontinuum generation had its breakthrough with the advent of photonic crystal fibers, which permitted an advanced control of light confinement, thereby greatly improving our understanding of the underlying phenomena responsible for supercontinuum generation. More recently, maturing in fabrication of photonic integrated waveguides has resulted in access to supercontinuum generation platforms benefiting from precise lithographic control of dispersion, high yield, compact footprint, and improved power consumption. This Review aims to present a comprehensive overview of supercontinuum generation in chip-based platforms, from underlying physics mechanisms up to the most recent and significant demonstrations. The diversity of integrated material platforms, as well as specific features of waveguides, is opening new opportunities, as will be discussed here.

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“…This would eliminate or reduce the need for an external flattener on-a-chip. Very broad spectra have been demonstrated in, for example, SiN [440], magnesium oxide doped lithium niobate thin films on silicon [428,433], tantala [431,441], and aluminum nitride structures [434].…”

Section: Statusmentioning

confidence: 99%

2023 Astrophotonics Roadmap: pathways to realizing multi-functional integrated astrophotonic instruments

Jovanovic,

Gatkine,

Anugu

et al. 2023

J. Phys. Photonics

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Photonic technologies offer numerous functionalities that can be used to realize astrophotonic instruments. The most spectacular example to date is the ESO Gravity instrument at the Very Large Telescope in Chile that combines the light-gathering power of four 8-m telescopes through a complex photonic interferometer. Fully integrated astrophotonic devices offer critical advantages for instrument development, including extreme miniaturization when operating at the diffraction-limit, plus integration, superior thermal and mechanical stabilization owing to the small footprint, and high replicability offering significant cost savings. Numerous astrophotonic technologies have been developed to address shortcomings of conventional instruments to date, including the development of photonic lanterns to convert from multimode inputs to single mode outputs, complex aperiodic fiber Bragg gratings to filter OH emission from the atmosphere, beam combiners enabling long baseline interferometry with for example, ESO Gravity, and laser frequency combs for high precision spectral calibration of spectrometers. Despite these successes, the facility implementation of photonic solutions in astronomical instrumentation is currently limited because of 1) low throughputs from coupling to fibers, coupling fibers to chips, propagation and bend losses, device losses, etc., 2) difficulties with scaling to large channel count devices needed for large bandwidths and high resolutions, and 3) efficient integration of photonics with detectors. In this roadmap, we identify 23 key areas that need further development. We outline the challenges and advances needed across those areas covering design tools, simulation capabilities, fabrication processes, the need for entirely new components, integration and hybridization and the characterization of devices. To realize these advances the astrophotonics community will have to work cooperatively with industrial partners who have more advanced manufacturing capabilities. With the advances described herein, multi-functional integrated instruments will be realized leading to novel observing capabilities for both ground and space based platforms, enabling new scientific studies and discoveries.

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Supercontinuum generation in tantalum pentoxide waveguides for pump wavelengths in the 900 nm to 1500 nm spectral region

Cited by 17 publications

References 31 publications

Stable and compact RF-to-optical link using lithium niobate on insulator waveguides

Stable and compact RF-to-optical link using lithium niobate on insulator waveguides

Supercontinuum in integrated photonics: generation, applications, challenges, and perspectives

2023 Astrophotonics Roadmap: pathways to realizing multi-functional integrated astrophotonic instruments

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