High Power Laser Science and Engineering, Volume. 9, Issue 2, 02000e26(2021)
Modeling of three-dimensional exciplex pumped fluid Cs vapor laser with transverse and longitudinal gas flow
Figures & Tables(10)
![Comparison of slope efficiency between experiment[19" target="_self" style="display: inline;">19] and simulation results.](/Images/icon/loading.gif){kind=icon}
Fig. 3. Comparison of slope efficiency between experiment[19] and simulation results.
Fig. 4. Three-dimensional temperature distribution under different flow directions. The velocity of flow and wall temperature in (a) and (b) are 50 m/s and 473 K.
Fig. 5. (a), (b) The temperature distribution in the 
in the
Fig. 6. Optical-to-optical efficiency and maximum temperature as a function of flow velocity with different pump intensity at
Fig. 7. Optical-to-optical efficiency and maximum temperature as a function of flow velocity with different wall temperature at pump intensity of 5 × 1010 W/m2.
Table 1. Kinetic processes in the XPAL system.
View tableView in ArticleTable 1. Kinetic processes in the XPAL system.
No. Process Cross-section/rate References Thermal associative/dissociative process 1 $\mathrm{Cs}\left({6}^2{S}_{1/2}\right)+ \mathrm{Ar}\rightleftharpoons \mathrm{Cs}\left({X}^2{\varSigma}_{1/2}^{+}\right) \mathrm{Ar}$ ${k}_{01},\ {k}_{10}$ [ 12 ]2 $\mathrm{Cs}\left({B}^2{\varSigma}_{1/2}^{+}\right) \mathrm{Ar}+ \mathrm{Ar}\rightleftharpoons \mathrm{Cs}\left({6}^2{P}_{3/2}\right)+ \mathrm{Ar}$ ${k}_{23},\ {k}_{32}$ Pumping 3 $\mathrm{Cs}\left({X}^2{\varSigma}_{1/2}^{+}\right) \mathrm{Ar}+h{\nu}_p\to \mathrm{Cs}\left({B}^2{\varSigma}_{1/2}^{+}\right) \mathrm{Ar}$ ${P}_{12}$ Equation (9) Lasing 4 $\mathrm{Cs}\left({6}^2{P}_{3/2},{6}^2{P}_{1/2}\right)\to \mathrm{Cs}\left({6}^2{S}_{1/2}\right)+h{\nu}_l$ ${L}_{30}$ Equation (8) Spontaneous emission 5 $\mathrm{Cs}\left({6}^2{P}_{3/2}\right)\to \mathrm{Cs}\left({6}^2{S}_{1/2}\right)+h{\nu}_l$ ${A}_{30}$ [ 26 ]6 $\mathrm{Cs}\left({6}^2{D}_{3/2},{6}^2{D}_{5/2}\right)\to \mathrm{Cs}\left({6}^2{P}_{3/2}\right)+ h\nu$ ${A}_{43}$ Photoexcitation 7 $\mathrm{Cs}\left({6}^2{P}_{3/2},{6}^2{P}_{1/2}\right)+h{\nu}_p\left(h{\nu}_l\right)\to \mathrm{Cs}\left({6}^2{D}_{3/2,5/2},{8}^2{S}_{1/2}\right)$ ${Phe}_{34}$ [ 26 ]Energy pooling 8 $2 \mathrm{Cs}\left({6}^2{P}_{3/2},{6}^2{P}_{1/2}\right)\to \mathrm{Cs}\left({6}^2{D}_{3/2,5/2},{8}^2{S}_{1/2}\right)+ \mathrm{Cs}\left({6}^2{S}_{1/2}\right)$ ${Ep}_{34}$ [ 27 ]Photoionization 9 $\mathrm{Cs}\left({6}^2{D}_{3/2,5/2},{8}^2{S}_{1/2}\right)+h{\nu}_{p,l}\to \mathrm{Cs}^{+}+\mathrm{e}$ ${Phi}_{45}$ [ 27 ]Penning ionization 10 $\mathrm{Cs}\left({6}^2{D}_{3/2,5/2},{8}^2{S}_{1/2}\right)+ \mathrm{Cs}\left({6}^2{P}_{3/2,1/2}\right)\to \mathrm{Cs}^{+}+ \mathrm{Cs}\left({6}^2{S}_{1/2}\right)+\mathrm{e}$ $Pen$ [ 27 ]Dissociative recombination 11 $\mathrm{Cs}^{+}+ \mathrm{Cs}\left({6}^2{S}_{1/2}\right)+ \mathrm{Cs}\to \mathrm{Cs}_2^{+}+ \mathrm{Cs}$ ${R}_1$ 12 $\mathrm{Cs}^{+}+ \mathrm{Cs}\left({6}^2{S}_{1/2}\right)+ \mathrm{Ar}\to \mathrm{Cs}_2^{+}+ \mathrm{Ar}$ [ 26 ]13 $\mathrm{Cs}_2^{+}+\mathrm{e}\to \mathrm{Cs}\left({6}^2{D}_{3/2,5/2},{8}^2{S}_{1/2}\right)+ \mathrm{Cs}\left({6}^2{S}_{1/2}\right)$ ${R}_2$
Table 2. Parameters of experiment and simulation.
View tableView in ArticleTable 2. Parameters of experiment and simulation.
Length of cell Temperature Pressure of Ar OC ratio 4 cm 455 K 1270 Torr 0.13
Table 3. Parameters used in the simulation.
View tableView in ArticleTable 3. Parameters used in the simulation.
Parameters Definition Value $L$ Length of the cell 2 cm $S$ Cross-section of the cell 2 mm $\times$ ${P}_{\mathrm{Ar}}$ Pressure of ethane 1300 Torr ${R}_{\mathrm{oc}}$ OC reflectivity 0.5 ${R}_p$ Back mirror reflectivity 0.99 ${T}_l$ Single-pass cell window transmission 0.98 ${T}_s$ Intra-cavity single-pass loss 0.9 ${w}_{0,p}$ Waist of the pump beam 0.5 mm ${w}_{0,l}$ Waist of the laser beam 0.5 mm
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Chenyi Su, Xingqi Xu, Jinghua Huang, Bailiang Pan. Modeling of three-dimensional exciplex pumped fluid Cs vapor laser with transverse and longitudinal gas flow[J]. High Power Laser Science and Engineering, 2021, 9(2): 02000e26
Paper Information
Category: Research Articles
Received: Nov. 16, 2020
Accepted: Feb. 1, 2021
Published Online: Jun. 10, 2021
The Author Email: Bailiang Pan (xuxingqi@zju.edu.cn)
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