Recent advances in optically pumped alkali lasers

Pitz, Greg A.; Anderson, Monte D.

doi:10.1063/1.5006913

Cited by 43 publications

(18 citation statements)

References 59 publications

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“…As the Q(5) coherent anti-stokes raman scattering (CARS) signal of the 2-1 vibrational band of the H 2 molecule was not detected, the population on the H 2 (1,5) energy level can be regarded as approximately zero. Equations ( 8), (9), and ( 11) can derive the ratio of the relative particle number density of the H 2 molecule v′′ = 0 and v′′ = 1 energy levels as η = n 1 /n 0 :…”

Section: Number Densities Of Ro-vibrational Levelsmentioning

confidence: 99%

“…The donor molecule provides energy during collision and the energy is transferred to the acceptor molecule through the collision relaxation process [6], so that it can obtain energy in the population of certain vibrations on the transfer level. It is very important to study the collision energy transfer of excited molecules [7], such as the prediction of the heat transfer, heating rate [8], and analysis of systems operating under non-equilibrium conditions (for example, chemical or optically pumped lasers) [9]. The state-to-state collision rotational energy transfer (RET) rate constant and the relaxation process of excited molecules also play a very important role [10] in laser-induced chemical reactions and combustion processes.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigations of Vibration–Vibration Energy Transfer in HBr(X1Σ+v'' = 5, 6)–H2 Collisions

Liu

Alghazi

Wang

2021

Russ. J. Phys. Chem. B

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This study experientally investigated the vibration-vibration (V-V) energy transfer process in the HBr-H 2 mixing system (molar ratio: 0.4; total pressure: 500 Pa) at room temperature (T = 295 K). Degenerate stimulated hyper-Raman pumping was used to excite HBr molecules to the X 1 Σ + v′′ = 5, 6 excited states, and the population distribution of the ro-vibrational states of the H 2 molecules following collision was determined by coherent anti-stokes raman scattering (CARS) Spectroscopy. The scanning coherent anti-stokes raman scattering (CARS) spectra revealed that the H 2 molecules were populated at vibrational rotation energy levels of v = 1, 2 after colliding with the HBr (v′′ = 5, 6). The ratio of the population of each vibrational rotation energy level of the H 2 molecules was obtained through simple dynamic model analysis and the relative intensity ratio of the coherent anti-stokes raman scattering (CARS) spectrum. The analysis of the Boltzmann distribution and relative intensity ratio of the H 2 molecule v = 0 in thermal equilibrium demonstrated the population of the v = 1, 2 vibrational rotation energy level after the collision of the H 2 molecule with HBr (v′′ = 5, 6). After colliding with HBr (v′′ = 6), the ratio of the number of particles of the H 2 (1, 3) and (2, 3) levels ξ = n 1 /n 2 had multiple values, and the theoretical formula was fitted by the time-resolved coherent antistokes raman scattering (CARS) spectral profile. The actual population ratio was 1.76. The time evolution profile of the population number on the vibrational excited HBr (v′′ ≤ 5, 6) after colliding with the H 2 molecules was measured, and two-quantum near resonance in the HBr (v′′ = 5, 6) + H 2 system was observed. Thus, direct evidence that the two-quantum relaxation process occurred was provided.

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Section: Number Densities Of Ro-vibrational Levelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Vibration–Vibration Energy Transfer in HBr(X1Σ+v'' = 5, 6)–H2 Collisions

Liu

Alghazi

Wang

2021

Russ. J. Phys. Chem. B

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Section: Introductionmentioning

confidence: 99%

“…For applications which rely on a buffer gas to transfer population between atomic levels (such as DPAL systems [25], spin-exchange optical pumping [26], and dense gas laser cooling [27]), mixing and quenching cross sections are key parameters. A Rb DPAL typically operates using a high power but low beam quality diode laser to excite the Rb 5 2 S 1/2 → 5 2 P 3/2 transition [14,15,25]. Buffer gases are included in the alkali vapor to both broaden the atomic transition to more closely match the pump laser bandwidth, and to enable collisional excitation transfer between the 5 2 P 3/2 and 5 2 P 1/2 states.…”

Section: Introductionmentioning

confidence: 99%

Collisional excitation transfer and quenching inRb(5P)-methane mixtures

et al. 2019

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We have examined fine-structure mixing between the rubidium 5 2 P 3/2 and 5 2 P 1/2 states along with quenching of these states due to collisions with methane gas. Measurements are carried out using ultrafast laser pulse excitation to populate one of the Rb 5 2 P states, with the fluorescence produced through collisional excitation transfer observed using time-correlated single-photon counting. Fine-structure mixing rates and quenching rates are determined by the time dependence of this fluorescence. As Rb(5 2 P ) collisional excitation transfer is relatively fast in methane gas, measurements were performed at methane pressures of 2.5 − 25 Torr, resulting in a collisional transfer cross section (5 2 P 3/2 → 5 2 P 1/2 ) of (4.23 ± 0.13) × 10 −15 cm 2 . Quenching rates were found to be much slower and were performed over methane pressures of 50 − 4000 Torr, resulting in a quenching cross section of (7.52 ± 0.10) × 10 −19 cm 2 . These results represent a significant increase in precision compared to previous work, and also resolve a discrepancy in previous quenching measurements. arXiv:1812.09466v1 [physics.atom-ph]

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“…Subsequently, ML was studied in alkali vapors in pulsed [2,3] and continuous-wave (CW) mode [4]. Continuation of those early works lead to the development of optically-pumped alkali lasers [5]. A number of studies explored the connection and interplay between ASE and nonlinear parametric wave-mixing processes in alkali vapors, that might find applications in quantum information and communication.…”

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confidence: 99%

Polychromatic, continuous-wave mirrorless lasing from monochromatic pumping of cesium vapor

et al. 2019

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We report on studies of simultaneous continuous-wave mirrorless lasing on multiple optical transitions, realized by pumping hot cesium vapor with laser light resonant with the 6S 1/2 → 8P 3/2 transition. The multiplicity of decay paths for the excited atoms to their ground state is responsible for the emergence of lasing in a number of transitions, observed here in at least seven wavelengths in the infrared (IR), and at two wavelengths in the blue. We study the properties of the fields generated in the cesium vapor, such as optical power, directionality and optical linewidth. arXiv:1905.06997v2 [physics.atom-ph]

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Recent advances in optically pumped alkali lasers

Cited by 43 publications

References 59 publications

Experimental Investigations of Vibration–Vibration Energy Transfer in HBr(X1Σ+v'' = 5, 6)–H2 Collisions

Experimental Investigations of Vibration–Vibration Energy Transfer in HBr(X1Σ+v'' = 5, 6)–H2 Collisions

Collisional excitation transfer and quenching inRb(5P)-methane mixtures

Polychromatic, continuous-wave mirrorless lasing from monochromatic pumping of cesium vapor

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