High Power Laser Science and Engineering, 2016, 4 (4): 04000e37, Published Online: Jan. 19, 2017 Copy Citation Text  Follow This Article

Figures & Tables

Fig. 1. Energy level diagram for a cesium atom.

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Fig. 2. (a) Transverse view of an HC-PCF and (b) the schematic diagram of the diode-pumped cesium vapor HC-PCF laser system.

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Fig. 3. Output power versus pump power in different cases.

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Fig. 4. Absorbed power, output power, and optical-to-optical efficiency versus pump power in (a) Case 1 and (b) Case 5.

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Fig. 5. Absorbed power, output power, and population density ($n_{0}$) versus temperature of Case 1.

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Table1. Summary of critical parameters in our model.

Parameter description Value Reference Partial pressure of He 478.8 Torr This work Partial pressure of $\text{C}_{2}\text{H}_{6}$ 100 Torr This work Cell length $L$ 2 m This work Cell radius $R$ (hollow core of an HC-PCF) $50~\unicode[STIX]{x03BC}\text{m}$ This work Transverse section of the $D_{2}$ line $\unicode[STIX]{x1D70E}_{D_{2}}$ $1.53\times 10^{-9}~\text{cm}^{2}$ [13] Transverse section of the $D_{1}$ line $\unicode[STIX]{x1D70E}_{D_{1}}$ $2.31\times 10^{-9}~\text{cm}^{2}$ [13] Photo-ionization cross section $\unicode[STIX]{x1D70E}_{\text{photo-ionization}}$ $2.00\times 10^{-17}~\text{cm}^{2}$ [14] $D_{1}$ radiative lifetime $\unicode[STIX]{x1D70F}_{D_{1}}$ 34.9 ns [13] $D_{2}$ radiative lifetime $\unicode[STIX]{x1D70F}_{D_{2}}$ 30.5 ns [13] Lifetime of $6^{2}D_{5/2,3/2}$ and $8^{2}S_{1/2}$ levels $\unicode[STIX]{x1D70F}_{4}$ 60 ns [14] Energy pooling rate constant $k_{EP2}$ $7.1\times 10^{-10}~\text{cm}^{3}~\text{s}^{-1}$ [15] Energy pooling rate constant $k_{EP3}$ $2.8\times 10^{-10}~\text{cm}^{3}~\text{s}^{-1}$ [15] Penning ionization rate constant $k_{PI}$ $1.0\times 10^{-8}~\text{cm}^{3}~\text{s}^{-1}$ [16] Recombination rate constant $k_{\text{recombination}}$ $7.124\times 10^{-21}~\text{cm}^{6}~\text{s}^{-1}$ [17]

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Table2. Different cases investigated in the model.

No. Energy pooling Penning ionization Photo-ionization Case 1 $\times$ $\times$ $\times$ Case 2 $\surd$ $\times$ $\times$ Case 3 $\surd$ $\surd$ $\times$ Case 4 $\surd$ $\times$ $\surd$ Case 5 $\surd$ $\surd$ $\surd$

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Guofei An, You Wang, Juhong Han, He Cai, Zhigang Jiang, Ming Gao, Shunyan Wang, Wei Zhang, Hongyuan Wang, Liangping Xue, Jie Zhou. Deleterious processes of a diode-pumped cesium vapor hollow-core photonic-crystal fiber laser[J]. High Power Laser Science and Engineering, 2016, 4(4): 04000e37.