Accurate measurements of pressure-broadened linewidths in a transversely excited CO<sub>2</sub>discharge

Brimacombe, R. K.; Reid, J.

doi:10.1109/jqe.1983.1071773

Cited by 38 publications

(3 citation statements)

References 29 publications

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“…With these considerations, we estimate an effective Rabi frequency in the few GHz range. Nevertheless, this effective Rabi frequency was still larger than the ~500 MHz collisional linewidth of the CO 2 absorption lines at 100 torr [28], resulting in a normalized Rabi frequency, υ Rabi Δυ -1 , of ~ 3 as indicated on Fig. 2b.…”

Section: Measurements Of Resonant Nonlinear Refraction In Comentioning

confidence: 97%

Resonant nonlinear refraction of 4.3-μm light in CO2 gas

et al. 2019

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We use time-and frequency-resolved measurements of self-focusing and self-defocusing of 4.3 µm radiation in CO 2 gas to study the resonant nonlinear optical response in the vicinity of individual rovibrational lines. Measurements over a range of lines on the 4P and 4R branch of the 000-001 transition indicate that the nonlinear response of CO 2 is strongly affected by power broadening, resulting in a sign reversal of the nonlinearity as compared to that of a saturable two-level system.

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Section: Measurements Of Resonant Nonlinear Refraction In Comentioning

confidence: 97%

Resonant nonlinear refraction of 4.3-μm light in CO2 gas

et al. 2019

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“…In the official release of HITRAN2020, a constant value of n He = 0.3 was used for the temperature dependence of γ He for all transitions of CO 2 in HITRAN, based on the measurement from Nakamichi et al (2006). However, we later issued an update that made use of alternative experimental data from Deng et al (2009) and Brimacombe & Reid (1983). These data were fitted to a linear function up to J = 20.…”

Section: Carbon Dioxide (Molecule 2)mentioning

confidence: 99%

H₂, He, and CO₂ Pressure-induced Parameters for the HITRAN Database. II. Line Lists of CO₂, N₂O, CO, SO₂, OH, OCS, H₂CO, HCN, PH₃, H₂S, and GeH₄

Tan

Skinner²,

Samuels

et al. 2022

ApJS

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In recent years, extended efforts have been made to increase the potential for modeling and interpreting the spectra of planetary atmospheres using the HITRAN database. A significant objective is to provide broadening parameters due to the ambient pressure of He, H2, and CO2 gases. Since hydrogen and helium are the main constituents in the atmospheres of gas giants, and carbon dioxide dominates the atmospheres of many rocky planets, these spectroscopic data are essential for radiative transfer models dedicated to planetary atmospheres. In HITRAN2016, the He-, H2- and CO2-broadening parameters and their temperature dependencies, and in some cases pressure-induced shifts, were added to the line lists of CO, SO2, NH3, HF, HCl, OCS, and C2H2. This work describes a further expansion introduced in the HITRAN2020 edition. In particular, relevant data for the line lists of CO2, N2O, OH, H2CO, HCN, PH3, H2S, and GeH4 were added, while those for CO, SO2, and OCS were revised. The new data are based on the semiempirical models constructed on available and validated experimental measurements and theoretical predictions. These models strongly depend on the extent and quality of the available data. The paper explains how to use the online interface or the HITRAN Application Programming Interface (HAPI) to retrieve these data from the database. Examples of calculating a molecule’s spectra in a mixture of buffer-gases using HAPI are also provided. We also provide a set of Python codes allowing one to populate any line list of corresponding molecules with relevant broadening parameters.

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“…2 compares them with the gain spectrum of a typical CO 2 laser mixture, clearly revealing the challenge of generating and amplifying ultrashort pulses in a CO 2 laser. At low pressures (less than a few bars), the gain spectrum consists of individual rotational lines whose bandwidth (FWHM) is given by the following expression (Brimacombe & Reid, 1983 …”

Section: Challenge Of High Peak Powermentioning

confidence: 99%

Ultrashort Pulses

Mikhail¹,

Babzie²

2012

CO2 Laser - Optimisation and Application

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Accurate measurements of pressure-broadened linewidths in a transversely excited CO₂discharge

Cited by 38 publications

References 29 publications

Resonant nonlinear refraction of 4.3-μm light in CO2 gas

Resonant nonlinear refraction of 4.3-μm light in CO2 gas

H₂, He, and CO₂ Pressure-induced Parameters for the HITRAN Database. II. Line Lists of CO₂, N₂O, CO, SO₂, OH, OCS, H₂CO, HCN, PH₃, H₂S, and GeH₄

Ultrashort Pulses

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Accurate measurements of pressure-broadened linewidths in a transversely excited CO2discharge

Cited by 38 publications

References 29 publications

Resonant nonlinear refraction of 4.3-μm light in CO2 gas

Resonant nonlinear refraction of 4.3-μm light in CO2 gas

H2, He, and CO2 Pressure-induced Parameters for the HITRAN Database. II. Line Lists of CO2, N2O, CO, SO2, OH, OCS, H2CO, HCN, PH3, H2S, and GeH4

Ultrashort Pulses

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About

Accurate measurements of pressure-broadened linewidths in a transversely excited CO₂discharge

H₂, He, and CO₂ Pressure-induced Parameters for the HITRAN Database. II. Line Lists of CO₂, N₂O, CO, SO₂, OH, OCS, H₂CO, HCN, PH₃, H₂S, and GeH₄