Blue band nonlinear optics and photodarkening in silica microdevices

Tian, Ke; Yu, Jibo; Lei, Fuchuan; Ward, Jonathan; Li, Angzhen; Wang, Pengfei; Chormaic, Síle Nic

doi:10.1364/prj.459561

Cited by 10 publications

(3 citation statements)

References 54 publications

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“…The maximum bandwidth is achieved for an input pulse energy of 3.5 nJ. Higher pulse energies induce non-reversible photodarkening of the fiber 22 . The spectral bandwidth at the 6.5-µW/THz-level is in agreement with the simulation and scales logarithmically with input pulse energy (see inset Fig.…”

Section: Nonlinear Spectral Broadening In the Uv Regionmentioning

confidence: 97%

Broadband near-ultraviolet dual comb spectroscopy

Bernhardt

Fürst

Kirchner

et al. 2023

Preprint

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The highly energetic photons of ultraviolet light drive electronic, vibrational and rotational transitions in virtually all atomic or molecular species. This radiation is thus a prime tool for strongly selective spectroscopic fingerprinting and real-time environmental monitoring if broad spectral coverage, short acquisition times and high spectral resolution can be achieved – requirements that are in mutual competition in traditional applications. As a novel concept with intrinsic potency in all three aspects, here we introduce ultraviolet dual comb spectroscopy using two broadband ultraviolet frequency combs centered at 871 THz (343 nm central wavelength) and covering a spectral bandwidth of 35.7 THz. We demonstrate the potential of the novel spectroscopy platform by acquiring fully state-resolved absorption spectra of formaldehyde, a prototype molecule with high relevance for laser spectroscopy and environmental sciences, with acquisition times as short as 100 µs and an averaged spectral resolution of 50 GHz and perform element-selective real-time tracking of gas concentration changes. To our knowledge, this is the first realization of dual comb spectroscopy in the ultraviolet spectral region and the first tool to allow for a real-time monitoring of the trinity of rotational, vibrational and electronic excitations in molecular species of major earth-atmospheric relevance.

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Section: Nonlinear Spectral Broadening In the Uv Regionmentioning

confidence: 97%

Broadband near-ultraviolet dual comb spectroscopy

Bernhardt

Fürst

Kirchner

et al. 2023

Preprint

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show abstract

“…An additional challenge that may arise is photodarkening of the ONF, as has been observed for nanofibres in air when certain wavelengths of light are used [147,148]. Changes in temperature have been shown to circumvent this issue [148], but could be harder to control in an ultrahigh vacuum system.…”

Section: Challengesmentioning

confidence: 99%

Atom-light interactions using optical nanofibres—a perspective

Li,

Brown,

Vylegzhanin

et al. 2024

J. Phys. Photonics

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Complete control of light-matter interactions at a single quantum level is critical for quantum science applications such as precision measurement and information processing. Nanophotonic devices, developed with recent advancements in nanofabrication techniques, can be used to tailor the interactions between single photons and atoms. One example of such a nanophotonic device is the optical nanofibre, which provides an excellent platform due to the strongly confined transverse light fields, long interaction length, low loss, and diverse optical modes. This facilitates a strong interaction between atoms and guided light, revealing chiral atom-light processes and the prospect of waveguide quantum electrodynamics. This paper highlights recent advances, experimental techniques, and future perspectives of the optical nanofibre-atom hybrid quantum platform.

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“…Issues include limited material, dispersion and photon source selection; increased absorption and scattering losses; decreased performance due to material impurities and defects. High energy photons and high intensities can induce defects that increase losses, an effect known as photodarkening [272], which leads to a degradation of performance over time. UV PICs require smaller structures compared to their established NIR counterparts.…”

Section: Photonic Technologies For the Uv Domainmentioning

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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Blue band nonlinear optics and photodarkening in silica microdevices

Cited by 10 publications

References 54 publications

Broadband near-ultraviolet dual comb spectroscopy

Broadband near-ultraviolet dual comb spectroscopy

Atom-light interactions using optical nanofibres—a perspective

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

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