Output Characteristics of Multistage Alkali Vapor Laser Amplifiers

Jing Yang; Hankui Wang; Yu Zhu; Weifeng Liu; Gaoliang Wang

doi:10.3788/AOS201737.0914003

Journals >Acta Optica Sinica >Volume 37 >Issue 9 >Page 0914003 > Article

Acta Optica Sinica
Vol. 37, Issue 9, 0914003 (2017)

Output Characteristics of Multistage Alkali Vapor Laser Amplifiers

Jing Yang^*, Hankui Wang, Yu Zhu, Weifeng Liu, and Gaoliang Wang

Author Affiliations

College of Physics and Telecommunication Engineering, Zhoukou Normal University, Zhoukou, Henan 466000, China

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DOI: 10.3788/AOS201737.0914003 Cite this Article Set citation alerts

Jing Yang, Hankui Wang, Yu Zhu, Weifeng Liu, Gaoliang Wang. Output Characteristics of Multistage Alkali Vapor Laser Amplifiers[J]. Acta Optica Sinica, 2017, 37(9): 0914003 Copy Citation Text

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Fig. 1. Diagram of energy levels and corresponding transitions of Cs atom

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Fig. 2. Variation in amplified light power with flow velocity. (a) Pp=1 kW, Tw=110 ℃; (b) Pp=2 kW, Tw=120 ℃

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Fig. 3. Output power and particle number density of each energy level as a function of pump light intensity

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Fig. 4. Comparison of output powers of single-level amplifier and double-level amplifier with the same total pump power and vapor pool length

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Fig. 5. Relationship between output power and ratio of pump power of three-level amplifier. (a) Pp=1 kW, Ps=20 W, Tw=110 ℃; (b) Pp=2 kW, Ps=20 W, Tw=120 ℃

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Phase	Kinetic process	Reference
Pumping	Cs(6²S_1/2)+hv_p→Cs(6²P_3/2)	This work
Relaxation	Cs(6²P_3/2)+C₂H₆→Cs(6²P_1/2)+C₂H₆	[12]
Stimulated emission	Cs(6²P_1/2)+nhv_l→Cs(6²S_1/2)+(n+1)hv_l	This work
Amplified spontaneous emission (ASE)	Cs(6²P_3/2)→Cs(6²S_1/2)+hv₃₁Cs(6²P_1/2)→Cs(6²S_1/2)+hv₂₁Cs(6²D_3/2,5/2,8²S_1/2)→Cs(6²P_3/2,1/2,6²S_1/2)+hv_ij	[24][24][15]
QuenchingPhoto-excitation	Cs(6²P_3/2,1/2)+C₂H₆→Cs(6²S_1/2)+C₂H₆Cs(6²P_3/2,1/2)+hv_p,l→Cs(6²D_3/2,5/2,8²S_1/2)	[24][15]
Energy pooling	2Cs(6²P_3/2,1/2)→Cs(6²D_3/2,5/2,8²S_1/2)+Cs(6²S_1/2)	[15]
Photo-ionization	Cs(6²D_3/2,5/2,8²S_1/2)+hv_p,l→Cs⁺+e	[15]
Penning ionization	Cs(6²P_3/2,1/2)+Cs(6²D_3/2,5/2,8²S_1/2)→Cs(6²S_1/2)+Cs⁺+e	[15]
Recombination	Cs⁺+Cs(6²S_1/2)+Cs→ $\begin{matrix} C s_{2}^{+} \end{matrix}$ +CsCs⁺+Cs(6²S_1/2)+He→ $\begin{matrix} C s_{2}^{+} \end{matrix}$ +He $\begin{matrix} C s_{2}^{+} \end{matrix}$ +e→Cs(6²D_3/2,5/2,8²S_1/2)+Cs(6²S_1/2)	[15]

Table 1. Laser kinetic processes of Cs atom in DPALs

Parameter	Description	Value	Reference
$\begin{matrix} {T_{w}}_{} \end{matrix}$ /℃	Wall temperature	110, 120	[24], [15]
L /cm	Cell length	10	This work
R /mm	Cell radius	5	[24]
$\begin{matrix} {P_{s}}_{} \end{matrix}$ /W	Seed power	20	[24]
η	Transmission of the coupled lens	0.99	This work
t	Transmission of the cell window	0.99	This work
$\begin{matrix} {P_{He}}_{} \end{matrix}$ /P_atm	Pressure of helium	5	This work
$\begin{matrix} P_{C_{2} H_{6}} \end{matrix}$ /P_atm	Pressure of ethane	1	This work
$\begin{matrix} {ω_{p}}_{} \end{matrix}$ /mm	Pump beam waist	3.5	[24]
$\begin{matrix} {ω_{s}}_{} \end{matrix}$ /mm	Seed beam waist	3.5	[24]

Table 2. Main parameters involved in numerical calculation

Jing Yang, Hankui Wang, Yu Zhu, Weifeng Liu, Gaoliang Wang. Output Characteristics of Multistage Alkali Vapor Laser Amplifiers[J]. Acta Optica Sinica, 2017, 37(9): 0914003

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