Gas-phase broadband spectroscopy using active sources: progress, status, and applications [Invited]

Cossel, Kevin C.; Waxman, E.; Finneran, Ian A.; Blake, Geoffrey A.; Ye, Jun; Newbury, Nathan R.

doi:10.1364/josab.34.000104

Cited by 119 publications

(78 citation statements)

References 343 publications

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“…The overall spectral accuracy is delimited by the guaranteed accuracy of the employed wavelength meter. , that is in the same range or better than recently reviewed other techniques for gas-phase broadband spectroscopy [3]; (3) a measurement system that provides stable measurement conditions and the capability to prepare gas samples of the first 7 hydrocarbons either as pure gases or mixtures; (4) the measurement of pure gases and a binary gas mixture. The chosen approach combines high spectral resolution and high sensitivity with a wide spectral range.…”

Section: Resultsmentioning

confidence: 99%

“…However, FTIR spectrometers suffer from tradeoffs between sensitivity, path length and spectral resolution, due to the employment of incoherent light sources [2]. This limits the industrial applicability of FTIR spectrometers [3].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, rugged industrial implementations imperatively rely on the knowledge of accurate spectral models, which scale line parameters and absorption cross sections to match varying measurement conditions, e.g., temperature, pressure, and the presence of other species [2,3]. Common spectroscopic databases such as HITRAN, HITEMP, GEISA, PNNL, and others (cf.…”

Section: Introductionmentioning

confidence: 99%

“…[3]) cover in particular absorption cross sections and line parameters (e.g., self and air broadening) [15][16][17][18]. Although these databases experienced substantial progress over the decades, accurate models of complex molecules covering thousands of molecular absorption lines are still challenging or impossible due to the limited knowledge in accurate line parameters and absorption cross sections [3].…”

Section: Introductionmentioning

confidence: 99%

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High performance direct absorption spectroscopy of pure and binary mixture hydrocarbon gases in the 6–11 $$\upmu$$ μ m range

Heinrich

Popescu²,

Hangauer³

et al. 2017

Appl. Phys. B

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High performance direct absorption spectroscopy of pure and binary mixture hydrocarbon gases in the 6–11 $$\upmu$$ μ m range

Heinrich

Popescu²,

Hangauer³

et al. 2017

Appl. Phys. B

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“…The mid-and longwave-infrared (mid-IR and LWIR) spectral regions from λ = 3-8 and 8-15 µm are critical spectral regions for sensitive spectroscopic analysis of a variety of physical compounds such as complex molecular solids, gaseous species and liquid mixtures [1]. Optical frequency combs in particular have been used to achieve broadband spectroscopy with exquisite frequency resolution [2][3][4][5][6][7][8]. However, broadband mid-IR comb technology is still maturing and nearly all systems would greatly benefit from increased spectral coverage, lower power operation and improved robustness.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional integrated photonics in the mid-infrared with suspended AlGaAs on silicon

Chiles¹,

Nader²,

Stanton³

et al. 2019

Optica

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The microscale integration of mid-and longwave-infrared photonics could enable the development of fieldable, robust chemical sensors, as well as highly efficient infrared frequency converters. However, such technology would be defined by the choice of material platform, which immediately determines the strength and types of optical nonlinearities available, the optical transparency window, modal confinement, and physical robustness. In this work, we demonstrate a new platform, suspended AlGaAs waveguides integrated on silicon, providing excellent performance in all of these metrics. We demonstrate low propagation losses within a span of nearly two octaves (1.26 to 4.6 µm) with exemplary performance of 0.45 dB/cm at λ = 2.4 µm. We exploit the high nonlinearity of this platform to demonstrate 1560 nm-pumped second-harmonic generation and octave-spanning supercontinuum reaching out to 2.3 µm with 3.4 pJ pump pulse energy. With mid-IR pumping, we generate supercontinuum spanning from 2.3 to 6.5 µm. Finally, we demonstrate the versatility of the platform with mid-infrared passive devices such as low-loss 10 µm-radius bends, compact power splitters with 96 ± 1% efficiency and edge couplers with 3.0 ± 0.1 dB loss. This platform has strong potential for multi-functional integrated photonic systems in the mid-IR. arXiv:1905.01380v1 [physics.app-ph] 3 May 2019 have suitable optical transparency [23], and strong optical nonlinearities are also required for the generation or broadening of frequency combs in the mid-IR [15]. While significant Kerr nonlinearity is present in silicon, germanium and chalcogenide materials, they lack intrinsic second-order optical nonlinearities for highly efficient frequency conversion [6,7,24,25] and electro-optic modulation [26].Alternatively, group III-V materials possess many desirable properties for multi-functional integrated photonic systems including a high refractive index, strong second-and third-order optical nonlinearities, and wide optical transparency windows into the LWIR. A practical advantage of these materials is the ability to grow a chemically selective etch stop underneath a high-quality epitaxial device (donor) film, enabling wafer or chip-bonding film transfer techniques for heterogeneous integration [27,28]. This has enabled high-index-contrast III-V waveguides on other substrates such as oxidized silicon and sapphire [29][30][31][32][33]. However, to take full advantage of the broad transparency window supported by III-V semiconductors, it is necessary to pursue alternative geometries such as air-clad suspended waveguides. But even this approach requires a degree of caution, as most materials readily form surface oxide layers that also introduce absorption. Undercut etching has been used to suspend GaAs waveguides engineered for mid-IR difference frequency generation [34]. While this represents a promising step in the development of nonlinear mid-IR photonics with III-V materials, many issues remain, such as the propagation loss in the mid-IR region, atmospheric stabilit...

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Mid‐IR Applications

2020

Laser‐based Mid‐infrared Sources and Applications

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Gas-phase broadband spectroscopy using active sources: progress, status, and applications [Invited]

Cited by 119 publications

References 343 publications

High performance direct absorption spectroscopy of pure and binary mixture hydrocarbon gases in the 6–11 $$\upmu$$ μ m range

High performance direct absorption spectroscopy of pure and binary mixture hydrocarbon gases in the 6–11 $$\upmu$$ μ m range

Multifunctional integrated photonics in the mid-infrared with suspended AlGaAs on silicon

Mid‐IR Applications

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