Theoretical investigation on exciplex pumped alkali vapor lasers with sonic-level gas flow

Xu, Xingqi; Shen, Binglin; Huang, Jinghua; Xia, Chunsheng; Pan, Bailiang

doi:10.1063/1.4993583

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…To solve the above problem, flowing gas system has been introduced for high power DPAL [10][11][12][13]. In these flowing systems, the gas velocity in a tubular metal pipe can get to be more than 10 m/s by using a blower.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of a new kind of gas-flowing diode pumped cesium laser

An¹,

Yang²,

Guo³

et al. 2022

Advanced Lasers, High-Power Lasers, and Applications XIII

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A diode pumped alkali laser (DPAL) provides a significant potential for construction of high-powered lasers. To realize the scaling of a DPAL, heat management should be optimized. In this paper, a new kind of gas-flowing DPAL was proposed, in which a small cross-flow fan with diameter of 125 mm was set in the center of a cylindrical vapor cell whose diameter and thickness is 160 mm and 55 mm, respectively. The gain medium of cesium and the buffer gas of ethane were filled in the vapor cell with the total pressure is about 1 atmosphere. A mathematical model was constructed to systematically study the influence of the rotate speed on the internal temperature distribution and the output features of the laser. And then, the experimental study of the laser system was then carried out, in which the output laser at 894.3 nm with power of 32 W was obtained. The results show that both the velocity distribution and temperature distribution are greatly influenced by the rotate speed of the cross-flow fan, and then the heat generated from the DPAL can be took away efficiently, which is very important to the output performance of the laser system. These results indicate that this new type of gas-flowing DPAL might be a good choice for power scaling of DPALs.

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Section: Introductionmentioning

confidence: 99%

Experimental study of a new kind of gas-flowing diode pumped cesium laser

An¹,

Yang²,

Guo³

et al. 2022

Advanced Lasers, High-Power Lasers, and Applications XIII

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“…More recent detailed modelling of alkali laser systems [9,[14][15][16] indicated the need to significantly expand both the number of species and number of reactions in the BLAZE simulations. As such the model was expanded to also include Xe, Cs(6 2 D 3/2 ), Cs(6 2 D 5/2 ), Cs(7 2 P 1/2 ), Cs(7 2 P 3/2 ), Cs(8 2 S 1/2 ), CsXe(X 2 Σ + 1/2 ), CsXe(A 2 Π 1/2 ), CsXe(A 2 Π 3/2 ), CsXe(B 2 Σ + 1/2 ), Cs + , and Cs 2 + for a total of 21 species and 39 reactions, appendix A.…”

Section: Kineticsmentioning

confidence: 99%

“…A constant Penning ionization rate of 4 × 10 −14 m 3 s −1 [25] was used in this work, appendix A. Note that the Barbier rates [25] are for Rb rather than Cs and that the value for the states of interest were closer to the value of 4×10 −14 m 3 s −1 , rather than the constant value of 1 × 10 −14 m 3 s −1 used in other works [14,16,26]. Recombination reactions [14,27,28] that result in the creation of Cs 2 + were also added to the model.…”

Section: Ionization and Recombination Reactionsńmentioning

confidence: 99%

High-fidelity modelling of Cs-Ar and Cs-Xe exciplex pumped alkali lasers with temperature-dependent energy pooling and ionization reactions

Carroll¹,

Maggs²

2021

J. Phys. B: At. Mol. Opt. Phys.

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Parametric measurements of pulsed output energy from the four-level exciplex pumped alkali laser (XPAL) for Cs-Ar, Cs-Kr, and Cs-Xe as a function of input pump energy and temperature show a strong dependence on temperature. All three Cs-rare gas mixtures show a D 2 line laser performance increase with temperature towards a peak efficiency, followed by a decrease as temperature is increased beyond a peak performance point temperature. Prior simulations of Cs-Ar XPAL measurements indicated that energy pooling from the 6 2 P 3/2 state of Cs was significant at higher temperature and it was hypothesized that the addition of temperature-dependent reaction rates may be important. This paper presents new BLAZE Multiphysics TM simulations using temperature-dependent energy pooling reaction rates baselined to available experimental rate data. Also included are photoionization and Penning ionization reactions. These new calculations for Cs-Ar and Cs-Xe (Cs-Kr not yet simulated) show that the inclusion of temperature-dependent energy pooling rates and the subsequent onset of significant ionization can explain the rise and fall of XPAL performance with temperature with reasonable accuracy. Further, while Cs-Xe has a much stronger absorption characteristic than Cs-Ar, simulations show that the energy well present in the Cs-Xe B 2 Σ + 1/2 state increases the fraction of the Cs-Xe B-state relative to the Cs-Ar B-state, thereby resulting in energy output levels of Cs-Xe similar to that of Cs-Ar.

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“…The results showed that due to the high heat loading generated by multiple transitions, a sharp temperature gradient occurs in the cell, which may cause the experimental device to melt down and the stimulated emission to quench. Therefore, they introduced gas flow into the system to reduce the temperature gradient [13] and applied fluid methods to the CW XPAL system, with good simulation results being achieved [14] . In another approach, Yacoby et al performed in-depth fluid dynamic studies of alkali vapor lasers with super-fast gas flows [15,16] .…”

Section: Introductionmentioning

confidence: 99%

Simulation and analysis of the time evolution of laser power and temperature in static pulsed XPALs

Shen

et al. 2019

High Pow Laser Sci Eng

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A theoretical model is established to describe the thermal dynamics and laser kinetics in a static pulsed exciplex pumped Cs–Ar laser (XPAL). The temporal behaviors of both the laser output power and temperature rise in XPALs with a long-time pulse and multi-pulse operation modes are calculated and analyzed. In the case of long-time pulse pumping, the results show that the initial laser power increases with a rise in the initial operating temperature, but the laser power decreases quickly due to heat accumulation. In the case of multi-pulse operation, simulation results show that the optimal laser output power can be obtained by appropriately increasing the initial temperature and reducing the thermal relaxation time.

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Theoretical investigation on exciplex pumped alkali vapor lasers with sonic-level gas flow

Cited by 8 publications

References 13 publications

Experimental study of a new kind of gas-flowing diode pumped cesium laser

Experimental study of a new kind of gas-flowing diode pumped cesium laser

High-fidelity modelling of Cs-Ar and Cs-Xe exciplex pumped alkali lasers with temperature-dependent energy pooling and ionization reactions

Simulation and analysis of the time evolution of laser power and temperature in static pulsed XPALs

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